bchristal

Hello,

I have an older Trek 1200 road bike with Shimano 105 7 speed. The rear cassette is the kind you remove with two chain whips. The small cog threads on to the freewheel.

It's a 12-24. I would like to replace it with some easier gearing. All the 7 speed cassettes I see seem to be the type that use a splined cassete tool to remove, just like the 9 and 10 speed stuff. I'm not sure, but I don't think those will work with my old freewheel. Does anybody know what works and where to find it?

Thanks,

Brian

same time

Is this what you're looking for?

https://www.loosescrews.com/index.cgi...&id=1792240661

That one is almost the same as what you've got, 13-25. You could email them and ask if other Shimano cogs will work on the freehub, and maybe you could build your own custom cassette.

Or, you could get smaller chainrings up front or a triple chainring crank.

Moose

Check the inside of the freehub, I think some were threaded both sides, for the cog/lockring (outside) and a newer style lockring (inside).

marcusbandito

That sounds like a Uniglid rear hub/ cassette. Although you cannot purchase replacements any longer I have heard of ways to convert the uniglide freehub to a Hyperglid freehub, allowing you to use currently available components.

Gonzo Bob

As Moose suggests, check the freehub body to see if it has the Hyperglide threading - see the middle freehub here https://www.sheldonbrown.com/k7.html#hyperglide If it does, you can just get a new 7-speed HG cassette. You'll probably need to use a thin 1mm spacer behind the cassette if you get one that starts with an 11T - see https://www.sheldonbrown.com/k7.html#hyperdrivec

If your freehub body is not HG compatible, you can swap it to one that is. I did this on my 105 7-speed UG hub by buying an HG-20 7-speed hub and taking the freehub body off it and putting it on the 105.

grolby

That's a uniglide cassette, and the spines are slightly different compared to Hyperglide (HG bodies have one wide spline, to insure that the cog goes on with the right orientation). Uniglide cassettes are almost impossible to find these days. Your best bet is to buy a replacement HG cassette body. You can still use the same hub. Your LBS can probably order a 7-speed body, or you can find one online. Just remember that it must be a 7-speed body - an 8 or 9-speed will be too wide.