My 2 cents on what to consider in this scenario:
1. What size gearing were you running? If you buddy's fixed gear was running say 70 gear inches did you try to accelerate with the folding bikes geared at 70 gear inches (plus or minus a couple)?
2. I have personally always found fixed gear bikes to be snappier at accelerating. To loop back to #1 I would try your test while riding another friend's full-sized derailleur-equipped bicycle.
Last edited by mup24; 07-22-09 at 06:13 PM.
Reason: Fixed typo