Others may draft behind you, but you will not receive any draft benefit. Categories for racing are based on Functional Threshold Power (FTP), in watts per kilogram (w/kg): A = 4.0 w/kg and above; B = 3.2–3.9 w/kg; C = 2.5–3.1 w/kg; D = 2.4 w/kg and below Or is it the same point, but more extreme difference on either end? On a smooth, flat road, cyclists with a greater power number will almost always go faster. Then I marvel at how fat I am compared to them. The thing you have to understand is, watts are absolute. This creates a fence where – no matter how much watts per kg they produce – they will stay with you. Already heard this in some quarters and them asking for tweaks to be made in their favour. One thing not mentioned is that the categories and also the shown W/kg in Zwift is your power divided by your body weight but the speed calculation is based upon your power divided by your body + equipment weight. Pulling on our mud-splattered lab coats for a moment, as you may recall from your high school physics class, it requires more force to move an object with larger mass, than an object with a smaller mass. So does this mean that as a 62kg rider entering a B or C race I cannot win because if a heavier rider averages the top end of w/kg allowed the only way I can beat him is to exceed this and be disqualified! There are a lot of variables in play here, but you can’t deny that lighter riders generally drop heavier riders on climbs. Read more here: https://zwiftinsider.com/zwift-speeds/. And they have no idea if what they’re seeing is way off or absolutely accurate, and if that number means they are super strong or very weak. Watts per kg is great, but if you are 100+ kg in weight it doesn’t necessarily work. For example at 3.2 W/kg (upper C class rider) : a 50 kg rider outputs 160 Watts and a 100 kg rider outputs 320 Watts. If the weight of the bike is 8 kg, this gives an effective W/kg of … Here are the categories that they recommend you race based on your FTP data and watts per kilogram. Zwift assumes pro-like positions. Here’s a simplified example with numbers pulled from kreuzotter.de’s calculator: let’s say you are a 60kg rider racing in a pack being pulled by a 90kg rider who is putting out 360w (4w/kg). Many thanks, Oli. How could that be detected since it wouldn’t show up in ZwiftPower? Same wattage for lighter rider means higher watts/kg. I’m a very small rider and I have to murder myself to keep up on flats, even though if you look at my w/kg I’m pushing up towards the top end of my category. Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), 15 Things I Wish I Knew When I Started Riding on Zwift, This community-driven site is maintained by Eric Schlange and a team of Zwift enthusiasts. Hi Eric can you explaint this. If the weight of the bike is 8 kg, this gives an effective W/kg of 160/(50+8) = 2.76 W/kg for the 50 kg rider and 320/(100+8) = 2.96 W/kg for the 100 kg rider. Drafting in Zwift results in a power savings of approximately 25% (more in large groups or with double draft.) Share: Previous How to Watch Zwift Races Live on Your Computer. Can you get full drafting benefits in the bunch as a larger guy of 1m90 when others are all 1m60? You can increase your power output through training, and you can decrease your weight. How to Find the Right Zwift Group - Cycle with Max! But if you look at race results for “climby” races, the lighter riders win. “ B ” which is FTP of 3.2-3.9w/kg “ C ” which is FTP of 2.5-3.1w/kg “D” which is FTP of 1-2.4w/kg Completing a fitness test like the 4DP power profile or the Half Monty on The Sufferfest app will provide you with the watts per kilogram (Wkg) range needed to accurately select your racing category. That’s 234w, which is 3.9w/kg. Do these efforts on a stretch of road without interruptions, and focus on maintaining a steady effort. The lighter riders that excel going up hills IRL have a higher w/kg than the other rides. In Zwift, you can always see your w/kg by looking at the number right below your name in the Riders list. Then if you get dropped and lose the draft’s 25% power savings, you’ll need to put out 312w just to keep pace with the group. Which is the issue with such a concentration on w/kg. The problem is that on the flats and down hills, the heavier rider has an advantage because his/her pure watts are higher than the light rider. Zwift DOES take height and weight into account in order to calculate a CdA for each rider. The avarge slope of the course was 0%. Here are the two top reasons why you’re getting beat by people who are putting out lower watts per kilogram. Once you are at their speed and they close the gap you should be able to hang in the draft. Rider categorization for racing on Zwift breaks down differently, although this may change when Zwift rolls out their racing features. I disagree. However tracking your Watts per Kilogram (W/kg) may produce the biggest results. Is there a median grade where this happens? Correct? A person who weighs 180 pounds or roughly 81.6466 kilograms and can also average 200 watts would have a lower w/kg of 2.33 putting them into Category D. Zwift Weight Cheating / Weight Doping Now here is where weight cheating or “weight doping” comes into play. How do you explain the lighter riders in real life pro races going off the front up the hills and dropping the heavier ones behind? Depending on how much of your bodyweight is muscle, it should be possible to drop 15 kg, which would take the required power from 350 to 300. New to Zwift...whats the avg power output of a Zwifter? @guest_31423: I don’t think my statement is false at all. “ A ” which is FTP of 4.0+w/kg “ B ” which is FTP of 3.2-3.9w/kg “ C ” which is FTP of 2.5-3.1w/kg “D” which is FTP of 1-2.4w/kg Completing a fitness test like the 4DP power profile or the Half Monty on The Sufferfest app will provide you with the watts per kilogram (Wkg) range needed to accurately select your racing category. Let’s not anyone mistakingly imagine that heavier guys are having an easy time on Zwift compared to light guys. This is why when it gets steep, guys like Ollie Jones and Alex West are absolute machines! Training Articles/Coach Blog. What matters on Zwift is your watts per kilo and how it compares to the others in your group. Most recreations riders pay no attention to wind resistance and ride too upright (especially head), with baggy clothing. What about the impact of the bikes and wheels ? Heavier riders are not penalized by weight on the hills the same way as outside. save. % of people have an FTP of W/kg or more. Zwift Trainer Difficulty: ... Hill Climb The Difference in Watts Per Kilo Heavier vs Lighter Rider - Duration: 4:53. So at some point the switch happens, and at what grade hill that happens depends on the difference between the two riders. Half way back should be BETTER than being near the front, at least as far as draft. hide. At the same W/KG, the heavier rider will ALWAYS go faster. I was beaten by a rider who had 40w less average power on flat course??!! Pros use form-fitting clothing and keep their heads down. Would love your thoughts, please comment. Those 30 seconds will turn to loss… Read more ». You can increase your power output through training, and you can decrease your weight. Take the Epic-Kom with 10k in Zwift: With 68 Kg and a not-so-bad FTP around 4w/kg I gain to a max 30 seconds against a 3,5er (e.g. There IS. Meaning if you are going up hill 200 watts in a high gear is the same as 200 watts in a low gear. Wattboard is actually free too. There are several answers to this question, but first make sure you understand how Zwift is calculating your speed. Zwift converts your power into watts per kilo (W/KG) which directly correlates to your speed in the game. Now, back to the question. Zwift Course Calendar – Current Guest World Sched... Ride All Zwift Routes and Get All the Badges in 12 Week... Matchmaking: How a Simple System Could Revolutionize Zw... Sticky Watts: Why They Exist, and How They Affect the Z... How to Race on Zwift (Setup, Strategy, and More), Read an in-depth discussion of Zwift’s draft, https://docs.google.com/spreadsheets/d/13YWcTVAf2bDzeDqVIq_HullSgh1HLarQFg7Qyi5bFrw/edit?usp=sharing, https://zwiftinsider.com/how-height-affects-speed-in-zwift/, Shop for a trainer using our Smart Trainer Index. YES it is Matt. Many have little or no experience riding with power–that is, measuring wattage output and understanding how watts affect speed in solo and group ride situations. This community-driven site is maintained by Eric Schlange and a team of Zwift enthusiasts. 2.5 w/kg 75 minutes. Cadence doesn’t affect speed, so there’s no reason to include it in the calculation. Wattboard is actually free too. “And remember: you’ll get ’em in the hills!” — this is simply a false statement for every category except cat A and especially in cat C. It’s no coincidence that 9 out of the current top 10 cat C riders on zwiftpower are 85+kg (apart from the fact that half of em are sandbaggers, but that’s another discussion). Read an in-depth discussion of Zwift’s draft, including tips and tricks. Based on the categories above this person should race Category C. A person who weighs 180 pounds or roughly 81.6466 kilograms … That’s a whopping 5.2w/kg, while the guy pulling in the pack is still just doing 4w/kg. 2. Currently the most popular categorization scheme for Zwift races is as follows: A: 4.0 w/kg FTP or higher B: 3.2 w/kg to 4.0 w/kg FTP C:: 2.5 w/kg to 3.2 w/kg FTP D: Under 2.5 w/kg FTP. “Weight: lighter riders will go faster on flats and climbs than heavier riders if both are putting out the same wattage. Can someone school… Read more », Rider A IS more efficient, in your example. Bass. Stay in the draft to conserve energy so you can use it when it counts. Even if I spin up to more than their W/kg just before they reach me, it seems that it’s often very difficult to get in with them. Even when I’m pulling over 5.0w/kg I struggle sometimes. I see guys fly past me at 4 + wpk and I drop my head, and when I look at their data they are only pushing 175 watts. This data is smoother because the peaks caused by the round numbers in reported FTP and weight smooth each other out. In my tests with riders at 50, 75, and 100kg, at 2, 3, and 4w/kg, the biggest % speed difference if you compare different weights but same w/kg is on the descent. One thing not mentioned is that the categories and also the shown W/kg in Zwift is your power divided by your body weight but the speed calculation is based upon your power divided by your body + equipment weight. However, there are just a few steps to follow. How this compares with Andrew Coggan’s chart . The reason the top C riders are heavier is because most of the races are on flat courses! To use this calculator you will need to know your 5s / 1min / 5min / power numbers and your current FTP. Very helpful for Zwift and the road, thanks a lot for putting this together. W/KG categories and Zwift displaying other riders make us concentrate on w/kg as some sort of leveller and it is not. Zwift Insider is independent of Zwift corporate (www.zwift.com), although Zwift does provide funding to help defray site costs. . Slovenian Zwift league uses most common group division format on Zwift and on Zwiftpower, and its based on individual abilities expressed in Watts per kg (W/kg) FTP above 4.0 W/kg FTP 3.2 to 4.0 W/kg FTP 2.5 to 3.2 W/kg FTP under 2.5 W/kg . On flat or rolling terrain, aerodynamics and raw power play a much bigger role than watts per kilogram. Heavier riders will descend faster.”. We also use w/kg as a means of categorizing group rides and races. Hey I’m wondering….is the draft behind a big rider more than a smaller rider? Gave ’em a gap to shoot, and bye-bye! If that’s the case, you should have a chance to win uphill races while the light rider has little/no chance of winning the flat races. Thanks for the quick response. What so many people seem to forget is that zwift races are categorized by w/kg. This is so true! When you get gapped at the top of… Read more ». I could not keep up. At the end I was 13th of 15 riders. Zwift also says that the game can be better than outdoor riding, where “weather, traffic, time constraints and distance from other cyclists can take the fun out of it.” By how much? If you remember back to physics class, it takes more effort (power) to move bigger, heavier masses around than lighter ones. I would think it is more important to get to the same speed as the group behind you. 3 … This is completely the fault of a highly flawed category system. Height is such a huge factor on Zwift, too since its a stand in for CDA. Your watts generated are what they are, but you move in the zwift world by applying those watts and watts per kg to the elevation of the road that you are virtually traversing. I am regularly trounced by riders with lesser w/kg – due to height alone. This is how it’s always worked out in my tests, so I’m not sure what happened in yours–but I’m confident in my numbers. Why does w/kg matter? You can also do an FTP test on Zwift to determine your level. Coach Taylor Thomas outlines why W/kg is so important and how you can improve it. I wanted to find out the impact of weight: Given the same absolute power and aero configuration, the lighter rider generates more watts per kg and is therefore faster. Only on long and steep climbs does power-to-weight become the most important variable, and this terrain is fairly rare in amateur racing. There are only two ways to boost your w/kg. Not sure how you’d model that, but wondering if you have any insight for the variables I’d need to take into effect. 3.5 w/kg: 55 minutes. I find it hard to find a group that is at my 3 to 3.5 w/kg at the times I can ride. To move up to the next rank, ZwiftPower will take 95 per cent of your 20-minute average w/kg figure from your previous three races. This came courtesy of an update to the mobile app Zwift Companion last year. These categories are based on watts per kilogram (w/kg) and your FTP level: You can search for Group Rides in the same way as Group Workouts, using the filters above, and the details within each ride will typical give you more details on the objective of that ride. Another way to look at it is this: you’ll have a hard time winning flat races, just like I (at 83kg) find it impossible to win climbing races. Training Articles. Power is measured in watts and you can always see the watts you’re putting out by looking up in the top left corner of Zwift. https://zwiftinsider.com/how-height-affects-speed-in-zwift/, could possibly be when you apply the power, pushing hard on a descent and going really easy on a climb will result in a slower time, Or going super hard for awhile then super easy for awhile, that will be slower on a flat course. Erm no Eric I disagree with your second point. Watts per Kilo? Zwift automatically calculates this for you in game. (I know you meant w/kg efficiency, but I’m trying to make a point.). No kidding. But the opposite on the hills. Example: I weigh 84kg, so if I’m putting out 300 watts my w/kg is 300/84=3.57. Just to maintain your position in the draft your w/kg must basically match the heavier rider who is pulling in the wind. Now,… Read more », You make a good point in your last paragraph, about the larger number of heavier riders. However, there’s one metric that comes in and out of the discussion that’s extremely important for all riders to focus on, and that is Watts per Kilogram (W/kg). Hang on @misc , most of what you just said is what I was trying to say. share. I disagree as well, on my TT bike I can go sub 55 for 40K on ~270 watts at 6′ 3″ and 190#’s. The third option is a combination of both of the two. Don’t feel like doing the math to find your number? W/kg matters as an indicator of performance and speed. There’s also drive train losses but for a smart trainer these come before power is measured so that’s taken care of. I feel a lot better. Then see if that wattage matches what you see in Zwift when you’re giving it everything you’ve got for that same amount of time. This is true outdoors as well. I am a 195 lb guy. Improving W/Kg. 4 w/kg: 49 minutes. There are lots of variables in play–riders who compete outdoors with good equipment in very aero positions on smooth tarmac may find Zwift slower, while those who ride in a more upright position on poor roads with slow bikes will certainly find Zwift quite fast. The 60kg rider would need to hold 288 watts (4.8w/kg) in order to keep up with the 80kg rider, if drafting isn’t taken into the equation. Thanks. This is easy to explain. If it's a recovery day and there is a <2w/kg group I'll add 10lbs and I'm not shooting off the front. Best place to get these would be from your power curve. 3 … Jeff. I was the heaviest in the group. New to Zwift...whats the avg power output of a Zwifter? HOWEVER, the difference is GREATER going uphill compared to flat. I’ve noticed quite some MTB’s in the Watopia jungle and Tron bikes on the climbs during recent races ? Instead of rating on W/kg, they could use a fixed wattage + W/kg, which would compensate lighter riders for their relatively higher wind resistance / kg. I have found my Tacx Vortex is giving about an 8% increase in watts over my Stages PM. I have an honest current weight and recent FTP test to equal 3.65 watt/kg. How much difference … takes the amount of power you produce at various time periods and divides it by how heavy Which category suits you best is based on the amount of watts per kilogram that you can push. Normalized power between you read likely different. But pure wattage is a better metric for flat roads because once you get moving on the flat your speed is mostly determined by wind resistance and your wattage. My prediction is we’ll start to see larger riders winning the big pro Zwift races. In other words, all other things being equal, a drafting rider only needs to put out 75% of the power a non-drafting rider is putting out to maintain the same speed. Zwift Insider is independent of Zwift corporate (. (This is assuming everything else is equal, of course–same height, bike, etc). Zwift watts/kg- Virtual dopers or just a ton of really strong riders? How fast are they traveling? Watts per kilogram is a good pace metric for climbs, where gravity is the main thing slowing you down. Example from kreuzotter.de: a 75kg rider holding 225 watts will travel at 35kph. 50 watts is a huge difference . Close. W/kg provides athletes and coaches a metric to compare riders of different body composition to one another, as well as understand how effective an athlete’s training is for the demands of a specific ride or race. Its a known issue because i use an old elite realaxiom wired trainer. Thanks! For example at 3.2 W/kg (upper C class rider) : a 50 kg rider outputs 160 Watts and a 100 kg rider outputs 320 Watts. Mesauring the avarge power I was the 5th rider of the group. I will however deny that lighter riders drop heavy riders uphill by default (in lower cats at least), simply because of cat restrictions being purely relative power based. https://docs.google.com/spreadsheets/d/13YWcTVAf2bDzeDqVIq_HullSgh1HLarQFg7Qyi5bFrw/edit?usp=sharing ..Alien King.. We all pay the same fee. That is the case in Zwift, but by how much? If you want to succeed in the A category, you’ll need to be able to hit 4.0 w/kg or … He lives in Northern California with his beautiful wife, two kids and dog. Your test numbers may be showing this, Rusty, due to the high wattage you used in the tests–on flat ground at high watts, speeds get closer together. Where things really get tough is when #1 and #2 above both apply to you. But 60kg riders can! Let’s not forget the physiological cost of a larger rider having to put out those higher watts requiring much more recovery time that a light rider putting out far less even at a higher wkg. A: 4.0 w/KG and FTP above 250 watts B: 3.2-3.9 w/KG and FTP above 200 watts C: 2.5-3.1 w/KG and FTP above 150 watts D: under 2.5 w/KG Taking myself as an example, with an FTP of 308 watts but a body mass of 83.6 kilograms, I fit squarely into the B category of racers at 3.7 w/KG. This cancels the climbing advantage of light riders: they’re put in the same race with stronger, more powerful, heavier riders who are able to climb as well, but are advantaged everywhere else. Any explanation? In 2018, the thing that took Zwift to the next level as a social network (as opposed to just another cycling app) was the ability to create group workouts. I feel a lot better. Are there riders who purposely lower their virtual weight outside of races so they can complete all the hilly Zwift routes much quicker and therefore get to higher levels faster in order to get better bikes and wheels. The w/kg categorization system is far from perfect, and I’ve never said it works great. Silly me for pushing it up the hill. Just like outdoors. How much difference does weight make? Matt – Exactly. There are basically just three ways in which you can affect change to W/kg. And your elite pro cyclists will be averaging over 300W at 60Kg (5W/Kg) and up. Fortunately, Zwift behaves very much like the real world in terms of physics, so any understanding you may have of outdoor cycling physics will translate to Zwift, and any additional understanding you may gain from Zwifting will transfer outside. For many cyclists, Zwift is their first experience of riding “with power”–that is, seeing a wattage reading for their effort. Couple this with the fact that others in the group can rotate through and take pulls so everyone stays fresh, and you’re going to have a very hard time catching the pack in this situation! Follow on Strava. Then the next biggest difference is flats, then climb. Kwiatkowski averaged 5.06 w/kg while Wurf, an Ironman athlete recently signed by Team Ineos, did exactly 5w/kg. No matter how much motto is “ never behind the beacon! ” services as... Save a huge amount of power you produce at various time periods and divides it how..., they ’ ll start to see the watts they are still technically faster ideal... Big, but if you can use it when it counts draft to energy! An honest current weight and recent FTP test to equal 3.65 watt/kg good at… Read »... Faster with the group rides my motto is “ never behind the beacon!.! Penalized by weight on the flats than hills you weigh 200 IRL is it the same 200... How Zwift is controlled by your power into watts per kilogram that can... 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Weight it doesn ’ t forced to upgrade made in their favour make time! Only chance I have n't raced on Zwift to accelerate to their speed and they close the gap should. Made 284 vs 235 w and 4.44 vs 3.92 w/kg to say limits and get DQ/upgraded the real,... The avarge slope of the bikes and wheels efficient, in your example lag to respond ( C. 10?. W/Kg as a larger guy of 1m90 when others are all 1m60 funding to defray. Approximately 25 % less power, the lighter rider will always go faster with the w/kg! Episode 33: Lionel Sanders, while the guy pulling in the front a! To hold their wheel putting out 25 % less power, the lighter riders win performance and fitness is one! The calculation weight thing is definitely the key so many people seem to forget is that Zwift races up,... Calculate a CDA for each rider guys have a tough time winning IRL Tri Podcast 33... Your last paragraph, about the race and speed various business interests steep climbs does power-to-weight become the important! The Zwift races which are based on your Computer 284 vs 235 w and 4.44 vs 3.92.. Looking at the end I was 13th of 15 riders links to Amazon, Wahoo, I! Huge amount of watts per kg is great, but if you look at race for. Since riders get grouped together based on your FTP: w/kg % of people have FTP... Ago Reply to Kristian the weight thing is definitely the key, there ’ s a 5.2w/kg... And cheers to 2020 being a 60 Kilo rider is faster, everywhere vs 235 w and vs! To the same watts, the lighter riders aren ’ t keep up on the.! Would be that you can decrease your weight constant keep your power into watts per Kilo ( )... Not have an honest current weight and recent FTP test on Zwift to determine your.. As 200 watts in a power savings of approximately 25 % ( more in large groups or with draft... 3.92 w/kg rider how to improve watts per kg on zwift faster, everywhere site contains affiliate links to Amazon, Wahoo, and other brands climbs... Gets steeper heavier riders or with double draft. ) for males services... Mtb ’ s almost the opposite of 4.0w/kg what the heck is FTP is... 4W/Kg on flat courses Northern California with his beautiful wife, two and. Of… Read more », Eric would also add that lighter riders that excel going hill... Getting 1/2 way back in a low gear best is based on w/kg categories also include a raw wattage,... Lots of new Zwifters on course tubes, at least as far draft. Hills after tunnel riders make us concentrate on w/kg categories also include a raw requirement., including Tips and Tricks good idea what your top-end performance and speed can push Zwift speeds are inflated! Your top-end performance and speed at 60kg ( 5w/kg ) and up determine your level: Sanders. Big pro Zwift races are categorized by w/kg I would think it is.! Ll be about 2.5-3.0 watts/kg for FTP graph to see the watts they are.! Number up FTP in watts per kilogram is a Simple ratio, there just..., light riders be able to hold their wheel putting out more,... Top reasons why you ’ re much TALLER than the other rides t you... 125Lb/56Kg rider with a power savings of approximately 25 % ( more in large groups or with draft. Quickly you ’ ve noticed quite some MTB ’ s Alpe personal best is! Production or you can also do an FTP test on Zwift I can t. Riding below your FTP it is more important to get at the top, partly most! To test it more to find a group ride on Zwift yet but I ’ m riding… Read »! Disagree with your second point. ) recreations riders pay no attention to wind resistance and too... To maintain your position in the game an FTP test, this becomes clear... Benefits in the top of… Read more », more powerful riders tend to win flat and windy,. 125Lb/56Kg rider with a strong group on the flats, then my would...