Switched from Bontrager Race Lite Hardcase 32s to the 25s on my Trek FX 7.5. Really glad. Picked up a couple miles per hr. Felt a little narrower for the first couple of minutes, then never thought about it again after that. Do feel the chip seal with higher pressure. Have to keep reminding husband that I don't really need 100+ pds of pressure for my weight. Happy Biking