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Gears 11-23 or 12-25(5 posts)

Gears 11-23 or 12-25Chas
Apr 4, 2001 7:03 PM
I'm building a Trek 2300 and am not sure about the cog set.
What is the performance difference between the 11-23 and 12-25.
I plan on a triple up front.
re: Gears 11-23 or 12-25muncher
Apr 5, 2001 4:31 AM
Can be a fair bit, esp at the top end. Depends on the type of terrain you ride in (flat/hilly), how fit/powerful you are, how bigger a gear you like a push (prefered cadence), on the cogs in between - do you have a fav combination that you wil get on one and not the other? As a very genereal statement, I would say that if you have the triple, then go for the 11-23, as you will have plenty of bottom range - hard to say though on the info above.
re: Gears 11-23 or 12-25Larry Meade
Apr 5, 2001 5:54 AM
Unless you live in an area where you have a lot of long descents, you would probably be better served with the 12-25. In normal riding situations, an 11 tooth cog is nothing more than a spacer in the rear. If you are using a Shimano triple, the stock middle ring is a 42. By going with the 25 in the rear, you will have more climbing gearing without having to drop to the granny ring. The 42x25 figures out to about 44.8 inches and a 39x23 comes out to 45.2 inches. Going with the 25 will give you virtually the same low end as most stock doubles, which typically come with a 39 front ring. This can be important in a group riding situation where if you have to resort to the granny ring, there is a lot of shifting involved and the loss of momentum could find you struggling to keep up. Keeping the 25 will give you very similar to double setups. You then have the granny ring for the more extreme climbing situations. On the other end of the cassette, a 52x12 (stock Shimano triple is 52 large ring) is ample gearing for all but the fastest of sprints or downhills.

re: Gears 11-23 or 12-25samcat
Apr 5, 2001 2:31 PM
11-23= 11-12-13-14-15-17-19-21-23---good
12-25= 12-13-14-15-17-19-21-23-25---better, and your point is well taken, Larry
12-23= 12-13-14-15-16-17-19-21-23---best, 'cause of the 16

You'll likely need the 16 for group rides, and will probable use it alot. You'll miss not having it if you go with the top two choices, methinks.
Double shifting, if necessary, is a snap with a triple if you install a "Third Eye"
Just my $000.02

Gear Charts at BSNPsyDoc
Apr 5, 2001 7:12 AM
The BSN website has a program that provides 9-speed gear tables based on your specific set-up (e.g., crank length, chainstay length, tire size, chainrings, cassette cluster, etc.). The information provided may help you make your decison. The link to the BSN website is: