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Can I replace Sora 8 spd. cassette w/ MTB cassette?(5 posts)

Can I replace Sora 8 spd. cassette w/ MTB cassette?Tomas
May 15, 2001 6:40 PM
I'm specifically talking about an 8 speed XT 11-28 cassette? Providing there are no chain take up issues. I guess I just need to know if it will fit onto the hub and work as far as shifting. Thanks much.
Depends on your rear derailleurSpoke Wrench
May 15, 2001 10:08 PM
The XT cassette will fit onto your freehub body without problem.

Shimano rates a Sora rear derailleur for a largest rear cog with 27 teeth. You MIGHT be able to cheat enough to make it work by dialing in the "B" screw on the back of the derailleur to keep the derailleur pulley from hitting the largest cog. If that doesn't work, plan B is to get a mountain bike rear derailleur. It will work with your shifters.

If it was my bike, I wouldn't worry very much about slack take up. Just make sure your chain is long enough to handle the big/big combination. If the chain goes slack in the little/little, that's OK. No one ever uses that combination anyway.

Good luck.
making big cog work w/ short cageclub
May 16, 2001 4:20 PM
if the B tension screw fully screwed it doesn't work, you'll know when in the small ring and big cog, cause the upper pulley will be so close to the cog the chain will run roughly in between. I've made 32t MTB cogs work with a shortcage road rear derailleur by taking a couple of links -- 1 or 2 pairs - out of the chain to shorten it. this pulls the derailleur cage forward more, which rotates the upper pulley further away from the big cog. only caveat: you won't be able to use the big/big, maybe not even the second biggest cog with the big chainring. if that's not a problemfor you -- it's not for me -- then you can run all kinds of nonstandard stuff that would make shimano cringe. another benefit of my method is higher chain tension, so the chain doesn't slap around as much and is less likely to derail on bumps. oh, i forgot this is a roadie board, nevermind about the bumps
Thanks guystomas
May 16, 2001 5:56 PM
Great advice and help, I appreciate it.
re: Can I replace Sora 8 spd. cassette w/ MTB cassette?dcr915
May 16, 2001 11:38 PM
Hey there
I did it to my wifes bike. It has a double chainring and she just cant push it. To only thing I had to do was up grade the rear deraluer to a med cage.
Good luck
Dennis
Ride hard and have a blast