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What gearing?(5 posts)

What gearing?schills
Mar 24, 2002 5:48 PM
I'm racing crits now more and more and have realized that I'm never using the biggers cogs on my 12-25. Question is, what cassette should I put on. I'm racing Cat 5 and several 4/5 events. I run a 53/39 up front. I never really spin out on the 12, just wondering if 12/21, 12/23, or 11/something would be more appropriate with a more even spacing of the gears. This bike is only used for crits and triathlons. I use a different bike and wheels for road races. Any thoughts would be greatly appreciated.



p.s. High end speeds in these events range between 30-36 mph.
re: What gearing?rollo tommassi
Mar 24, 2002 6:40 PM
you could put on a what is nicknamed a "corncob" or "straightblock" cassette: 12-13-14-15-16-17-18-19-20 (for 9spd).

you can also swap the 39 front off for a 42 or 44 for those not-so-flat crits.
Depends on rider and terrainKerry Irons
Mar 24, 2002 8:30 PM
If you're not climbing steep hills, a 21 is probably good enough, and certainly a 23 should be. The only time you'd likely need the 12 is for a downhill or tail wind finish, especially since you say you never spin it out. A 13-23 gives a very tight set of cogs.
re: What gearing?LC
Mar 25, 2002 10:29 AM
I live in a hilly area, use a 12-23 and use a 50-39 chainrings or sometimes put on a 53 tooth ring depending on the course. I like to climb hills in the 50x21, so having the 23 is more of a spacer thing so I don't cross the chain over too much. It is still easy to hit 36 mph in a 50x12. If I lived in a flatter area I would definitly get a 12-21.

Every cassette has a 21 cog, so try some of the courses without going over the 21 and if that is enough then you will know what to get.
re: What gearing?brider
Mar 26, 2002 1:40 PM
I use a 52/39 with an 11-21 (8-speed!) for most all my riding (except the REALLY long and steep stuff, like RAMROD, then I go with a 23). You can cobble together virtually anything you want, but you DON'T EVER want to spin out your gears in a crit (if you do, then your gearing is too low). I'd forget about whatever your small ring is for racing, as you shouldn't be touching it. The longest hill you'll have is two blocks, and you can get by with a lot of momentum. If you have to shift in the front on a crit, then you need a bigger rear cog. You could almost take off the inner ring for crits (you might want it if you start going uphill, but once you're in the big ring, stay there). Which gear do you use most? I'd say give yourself at least two cogs above that (4-tooth difference total),and at least three smaller cogs.