J

Last week our cycling club had a spinning session at the local health

club. Dag-Otto Lauritzen was the leader and Steffen Kjærgaard was

there too. (Both ex pros, 7-Eleven, Motorola, US Postal) They showed

Tour de France video on the big screen, and it was big fun. At one

point I made a feeble joke about managing not to get dropped, and later

the conversation turned to hooking up odometers or similar to the

spinning bikes. I suggested a watt or work meter. Late while a few of

us got together to ride rollers, we discussed the effort involved in

using rollers.

So I started thinking about calculating the watts required to acheive a

given speed as measured by the computer. This might be a fun problem

for the math whizzes over on rec.bicycles.tech, I thought!

So going with somewhat normal wheels like Shimano WH-550 or Campy

Vento, how would be estimate the watts need to spin them in still air?

And how would we use rider weight to estimate rolling resistance for 3

contact points? And losses from the drive train? Assume 53x13.

Any takers?

Joseph