This seems to be a bit extreme to me as well. My Raleigh c700 is an aluminum hybrid and although i can't sustain high speeds as well or climb quite as fast while riding it, i wouldn't say that i was working more than 2x as hard while riding it. Maybe 20% more; so 50 miles on the road bike would be equivalent to 40 on the hybrid. And that might even be a stretch!




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