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Old 06-19-09, 09:28 PM   #1
Mudu93
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MTB 8 spd shifter campatible with 7 spd cassete?

My vintage Miyata Elevation 8000 has a shifter that is going bad. Will an 8 speed shifter index the 7 speed cassete or must I now begin the search for a good used or NOS set of 7 lx to xt level rapid fire shifters.
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Old 06-19-09, 10:23 PM   #2
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It will work fine, you will just have one less gear available. The cassette spacing on an 8 speed cassette is near identical to a 7 speed cassette. The 8 speed cassette is about 4 mm wider. I use an 8 speed shimano bar end shifter on my 7 speed shimano hyperglide cassette, and it indexes perfect.
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Old 06-19-09, 10:30 PM   #3
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Quote:
Originally Posted by Mudu93 View Post
My vintage Miyata Elevation 8000 has a shifter that is going bad. Will an 8 speed shifter index the 7 speed cassete or must I now begin the search for a good used or NOS set of 7 lx to xt level rapid fire shifters.

Maybe yes, maybe no. The indexing on a 8-speed shifter is different from a 7-speed shifter- it might work OK if the tolerances stack up right. I tried it (once, a long time ago) and I couldn't get it to index properly.

What's going on with the shifter? Many times a good spritz of spray lube into the shifter restores it to usefulness.

If it does really need replacement, you can still get 7-speed RapidFire shifters... just not XT or LX:
http://www.bikepartsusa.com/bikeparts/item/01-129865/
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Old 06-19-09, 11:36 PM   #4
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I've done it to two different bikes and it worked fine both times. Once with Shimano and once with Grip Shift.
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Old 06-20-09, 12:38 AM   #5
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I tried it and couldn't get it to do anything but work perfectly.

Ultegra 8 speed bar end shifters converted to thumb shifters, a 7 speed cassette and Shimano 600 derailers.

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