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In need of gearing advice(3 posts)

In need of gearing advicetimwat
May 29, 2002 9:06 AM
I recently bought a used Trek 5500 with an 8 speed 12-24 cassette. Since I ride alot in the hills, I would like to install a slightly larger cog in the back. Can I replace just the largest cog on the cassette? If so what brand cogs are compatable? If not, what brand cassettes are compatable? Any suggestions would be greatly appreciated.
My current set-up:

Campagnolo Chorus Crankset and rear derailer
Sachs New success rear hub
Sachs PG chain
Sachs cassette (12 tooth cog labeled LY 96 and 24 tooth labeled SY 96)

Thanks,
Tim
A little secretMootsie
May 29, 2002 7:24 PM
Here's a little trick: keep the cassette and change the small front ring from a 39 to a 38. It about the same as changing the largest cog on the rear, if you can do it at all, and its a lot cheaper. Excel Sports carries 38's if your LBS doesn't have them.
re: gearing adviceChen2
May 31, 2002 2:50 PM
I'm not familliar with your 8-speed Sachs cassette but if you go to www.sheldonbrown.com you can probably figure out how to modify your cassette and either replace the 24 with a bigger cog or drop a cog somewhere and add a bigger cog. I usually replace my 12 cog with a 13 and then add one somewhere to get the gearing I need. The smallest cog must have a "built-in" spacer. You may need to pull your Sachs cassette off just to see which cogs are single and which are combined. You can probably get what you need directly from Sheldon Brown. He's also helpful with advice.
~Al