Re: 24 m.p.h.???
It could be a little of both- and the wider tires.
I have a little formula when thinking about wheel size- just a quick approximation of percentages-
If you think about a wheel, say a 26" - then there are four factored to 100-
so any 1 inch change in size is roughly equal to a 4 % change,
the dif between 24" and 26" is 2 inches, or roughly 8% then-
so then you can expect an 8% gain then in changing from 24 to 26, (or 12% to 27"), it's like putting on a sprocket 8% larger
Then, since there is (even more roughly) a three factor for the sprocket (3 x 33 teeth)
a change of a tooth is a roughly 3% difference in either direction-
3 teeth makes about a 9% dif
so if you went to 26" wheel, you get 8% gain
and if you went to 36 instead of 40 teeth (4 x 3%) you get 12% gain-
and so with both these things you get approx. 20% gain in top end gearing
your 24 mph now (aprrox 4 to 100) is increased 4% with every mph- 20% would be 5 mph- roughly, on paper, at least
Wheel width and total weight are not so quantifiable, but I've found great dif in wheel width especially
and then there is engine performance.
Last edited by Nashville Kat; 12-02-2010 at 12:49 PM.