> On May 16, 2025, at 12:33 PM, George Schick <[email protected]> wrote: > > Two things that I have not noticed yet (and these may get me kicked off the > discussion thread): 1) tire width and pressure (therefore rolling resistance)
I noted in my original post that between the two bikes I used essentially the same tires. In the winter that would have been studded snow tires, which are significantly slower (require more power) than the Compass/Rene Herse tires I ride other times of year. My data covered exactly 1 year with each bike, so the tires aren’t a factor unless I had the snow tires on one bike for a significantly different amount of time. I generally keep my tires within a reasonable range of pressure that wouldn’t contribute to differences. > and 2) "wind breaks.” My commuting and the two rides I’ve described were all solo. So, no drafting effect. The tables and math that have been referenced also assume a single rider. It’s worth noting that the lead rider in a group (n>=2) benefits from the rider(s) behind, if the next rider stays close enough to interrupt the closing of the air at the back of the lead rider. I think that’s been measured at around a 10% reduction in air resistance, compared to a 50% reduction for the rider behind. Don’t quote me on that, those numbers are from memory. It’s not just people sitting up that have a reduced benefit of drafting. Tall people also pay a penalty. At 167cm and 60kg, people grumble about not getting much of draft behind me. I say all’s fair because I have way less inertia working in my favor. Tall, light, and upright would be an especially bad combo in a headwind. Ted Durant Milwaukee, WI USA -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/rbw-owners-bunch/8DA1A8DA-51DD-407C-87F4-DBC662C45CDA%40gmail.com.
