Join Date: May 2004
Location: Sumner, WA
Bikes: '92 novara ponderosa, '74 schwinn le tour, Novara fusion, novara transfer, novara randonee(2), novara careema pro, novara bonita(2).
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Yea nearly every new MTB out there has something like 11-13-15-17-20-23-26-30
I just changed my MTB to a custom cassette of 14-16-17-19-21-23-26-30, two tooth jump from 14-16.
I figured I hardly ever used my 15 13 or 11 when off road, even racing, so I went for a closer ratio in the mid range with a top end bailout for the down hills like your thinking. I have a 13 on hand if the 14 proves insufficiant, I just put it together, seems to work well but haven't had a real test yet(race).
My road bike uses 13-15-17-19-21-24-28, hyperglide style, freewheel and works dandy, 17 19 and 21 are the most used so its just right. 13-15 is two tooth.
That reminds me, what's with the 13 top on your bike, is it a freehub or freewheel?
13 to 12 in the back is the same as 50 to 54 in the front. 50x12 is 109.9 gear inches and 54x13 is 109.6 inches, even a full inch isn't noticable.(a bit less than one percent)