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 06-12-05, 02:44 PM #1 jobaba Newbie Thread Starter   Join Date: Jun 2005 Bikes: Posts: 1 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) Watts I am trying to calculate the amount of watts I am putting out. Do any of you know a formula that it can use with my weight, speed, wind speed that would tell me how many watts I am using.
 06-12-05, 04:29 PM #2 CdCf Videre non videri   Join Date: Sep 2004 Location: Gothenburg, Sweden Bikes: 1 road bike (simple, light), 1 TT bike (could be more aero, could be lighter), 1 all-weather commuter and winter bike, 1 Monark 828E ergometer indoor bike Posts: 3,208 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) Yes, but it's not that simple to do just like that. To be able to get a decent estimate, you'd need to provide: body size (seen from the front) weight bike's weight tyre size and tread road condition terrain profile wind speed and heading relative your direction of travel Even then, I'd say the margin of error is probably 30% or so...
 06-12-05, 10:39 PM #3 Guest Guest   Bikes: Posts: n/a Mentioned: Post(s) Tagged: Thread(s) Quoted: Post(s) Just get a professional measurement done by a sports facility or kinesiology lab at a university or a performance testing facility. Then it'll be accurate! Koffee
 06-12-05, 10:48 PM #4 sch Senior Member   Join Date: May 2003 Location: Mountain Brook. AL Bikes: Posts: 3,268 Mentioned: 3 Post(s) Tagged: 0 Thread(s) Quoted: 98 Post(s) www.analyticcycling.com has a power calculator that can give you a ball park figure for a road bike. If you can find a shop with a computrainer set up you can see what you can do on a stationary bike. Doesn't really help a lot but it is interesting. On the Giro recently a couple of cyclists had power meters on their bikes with remote readouts that were occasionally displayed on the screen and a few years ago on the HP ladies tour in Idaho, one of the ladies had the same and was running 200 to 400watts (400 were chases up short hills to reestablish contact with the peloton). Steve