Join Date: Sep 2007
Location: Dallas area, Texas
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Normally, mountain bikes have lower gearing than road bikes. If you're running out of gears on the low end, that's likely the issue. You can swap out cassettes and all to a certain extent, but you'd need to check with a good bike mechanic to see what the possibilities are. On a lower-end bike, that'd be pretty cheap, on a high-end bike, not so much.
There may also be some differences in your body position that make it work better on one bike than the other.
And, I'm assuming you're riding the same hills on each one so you're comparing apples to apples.
"be careful this rando stuff is addictive and dan's the 'pusher'."