Originally Posted by Gone in 60

... and that 30-year-old steel Trek 930 is a bit faster than my new Trek FX3 that is lighter with narrower tires. When I put new Michelins on the 930, I stuck with a 1.95 width so I could do some light trail riding if I wanted to. I'm riding a paved river trail for a good part of my commute that goes under major cross streets and freeways, so there's some downhill and uphill spots along the way. I'm finding the 930 faster downhill and carries more speed back uphill than the FX3. I'm wondering if the rotational mass of the heavier tires is helping to do that a bit.