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Road cassettes on MTB???(10 posts)

Road cassettes on MTB???biknben
May 19, 2003 5:34 AM
Why is it that a shimano road cassettes won't work on a mtb drivetrain? They are both "hyperglide" cassttes aren't they?

I recently took the small ring off my mtb crank and did a mtb race yesterday with just 9 gears. I had zero issues because the 13-34 XTR cassette has such a huge range. I'd prefer to run a tighter cassette and use a granny gear when I have to. Shimano only offers the XTR cassette in one size. Any workarounds or solutions out there? Can anyone explain why the road and MTB cassttes are not interchangeable?
A road cassette will workmhinman
May 19, 2003 5:55 AM
Any 9 speed cassette (road or mountain) will work with a with your 9 speed XTR. Shifting might be a bit sluggish on the bigger cogs because the XTR is designed to track the bigger cogs of a Mountain cassette, but it will work. If you don't like the shifting you could put on a road derailleur. BTW: alot of comfort bike and recumbents mix and match road and mountain components without a problem.
I tried it with bad results...biknben
May 19, 2003 6:05 AM
I have put on a road cassette in the past. I had to shift two gears to get the cahin to move one space and then shift back to get the der. alligned properly. Kinda like two steps forward, one step back. I couldn't get it to shift any better on the work stand so I never even rode it outside.

If I ran a road der., would the cage be long enough to take up the chain slack when in the small chainring?
Me toospeedisgood
May 19, 2003 6:14 AM
I've had the same problems but with 8 speed Shimano. Tried making my mountain bike into a winter commuter by slapping on an Ultegra cassette to an XT der./Gripshift drivetrain. Had to do the up 2/down 1 thing. Tried an old 8 speed Ultegra derailleur but that didn't improve things much, tho I admit I used the same chain so maybe the excessive chain length affected things.

I've always thought theoretically it should work (I've known people to successfully ride road cassettes on mtn. bikes) but for some reason it's eluded me. Just another excuse for me to by a dedicated commuter, I suppose.
3 sizes for XTR cassette.divve
May 19, 2003 6:40 AM
ba-group 11-12-14-16-18-21-24-28-32T
as-group 11-13-15-17-20-23-26-30-34T
ap-group 12-14-16-18-20-23-26-30-34T
I'd like 12-23 (nm)biknben
May 19, 2003 7:16 AM
go DA with DA triple rear derailleur nmDougSloan
May 19, 2003 7:49 AM
assuming the shifter works with it nmDougSloan
May 19, 2003 7:50 AM
check the weight weenies forum on MTBR...shawndoggy
May 19, 2003 9:23 AM
LOTS of folks run road cassettes with short cage road deraileurs. It definitely works.

As for compatibility, the road and MTB cassettes are absolutely compatible. Your shifting issues (as already pointed out) are probably attributable to chain tension. I also find 9 speed to be very sensitive to dirty cables and housing. Try changing out the rear der. cable and housing before declaring that this doesn't work.

Back in the day (early 90s) I had a second set of wheels with slicks and a road cassete (12-21) that I'd run on my MTB. Granted that was seven speed, but it worked like a champ.

re: Road cassettes on MTB???d-boy
May 19, 2003 2:10 PM
No problemo. For my mountain bike, I use a DA 12-23 with my semi slick tires and light weight wheels for roads and packed trails. When single tracking, I switch to my knobbies with an XT 11-32. Shifting works perfectly with both. I do use an Ultegra medium cage rear derailleur, but thats only because it was convenient. It shouldn't make a difference. My chain is adjusted for the worse case length when I use the 32 cog on the rear.