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two cassette questions(7 posts)

two cassette questionssimstress
Jan 10, 2002 3:01 PM
It's been a while since my last post here. My bookmarked URL didn't even work. Pathetic how life gets in the way of riding and riding-related activities!

I received a new wheelset (yay!) and want to put a 9-speed Ultegra cassette on it. I'm pretty sure that it is compatible with my current drivetrain (9-speed 105 double), but I just want to confirm. So is it?

My current wheels use a 12-23 cassette, and that gearing gets me through pretty much all of the hill country just fine. Initially, I thought I would put the same size cassette on the new wheels too, but now I'm considering a different cassette simply to try different gearing. Is that silly? I plan to use the new wheelset for fair-weather training and some crits. If you have multiple wheelsets, like for training and racing, do you use the same cassette on both? I realize some may have wheelsets dedicated for climbing or TT, but I'm just interested in discussing all-around gearing right now. TIA.
re: two cassettesChen2
Jan 10, 2002 3:25 PM
Good to see your handle here again. You can use any Shimano 9 speed cassette with your 9 speed 105 drive train with a 9 speed chain. The European Shimano web site has quite a lot of information about various Shimano available cassettes. Their European site isn't very intuitive, Go to choose European bicycles, road racing, catalog, Ultegra, Dura-Ace, etc., scroll down to cassettes (something like that). I printed off the pages with the exploded views and cog count charts.
to be backsimstress
Jan 11, 2002 10:43 AM
Thanks, Chen2. It's fun to be back. I missed the debates.
different gearing...C-40
Jan 10, 2002 3:44 PM
If you change to something other than a 12-23, do it for a specific reason. The 12-23 has the important 16 tooth cog. If you change to a 12-25, you will lose the 16 tooth cog. If you really suffer on some of your climbs, maybe having the 25 would be worth the sacrifice.

With campy 10 speed you can have both!
Campy 10 speed1jtolleson
Jan 10, 2002 4:55 PM
How do you feel about using Campy's big 13-29 rear cassette with the 53/39 crank?

How do the low gears on a 39 in front plus 29 in back compare to the lowest gears you can get on a triple (a 30/25 combo)?
Jan 11, 2002 6:55 AM
39/29 X 27 = 36.3 gear inches
30/25 X 27 = 32.4
30/27 X 27 = 30.0
staying putsimstress
Jan 11, 2002 10:48 AM
I probably don't need the 39-29 combo. As another poster pointed out, I should pick a cassette for a real reason, so I've decided to stick with the one I know that works already for me. Besides, I would have to adjust the number of teeth individually on my FlightDeck every time I changed wheels. I'm too lazy for that. My next computer, however, will have multiple bike settings. Thanks.