Absolutely not scientific but I have recently had the occasion to ride the exact same 6 mile trip twice a day 3 days in a row on 3 Very different bikes. A Brompton, a 1952 Raleigh 3 speed, and a ‘75 Motobecane Grand Record. No speedometer, but rode equally comfortably brisk, what felt like the same effort. . ( one day was windy ). It felt like there was a huge time difference that just wasn’t there. All trips were within a 2 minute window. Apparently once you have a nice round tire full of air you are 98% there.
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