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July 15, 2021, 6:28 a.m. -  Tjaard Breeuwer

Yep, well said. Obviously fitness is the biggest issue. There is easily a 200% or bigger difference in sustained power output between people, while bike weight only changes the system total system weight (bike+gear+rider)  maybe 5%.  I think part of reason lighter bikes are rated so much higher for climbing is in the tires. You don’t mention casing, but lighter tires not only save weight, they also roll easier due to more supple casings, and typically are made with harder, faster rolling rubber. That said, for rides with extended hike-a-bike sections, 10% weight savings really does make a big difference.

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