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  1. #1
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    M970 Crank Installation Problem

    Hey,
    I decided to uprgrade my 960 XTR with the new 970 stuff this year and I've got most of it on now but the crank is giving me a hard time. I cannot get the left arm to go flush with the bottom bracket. There's a 1/4" gap there and I cant tighten that nut anymore. The kit came with these tiny plastic spacers but??? that's so dumb!! If I put the spacers in, my left pedal distance to the seat tube is more then the right pedal. When I compare the 960 I just took off to the new stuff, all lenghts and sizes are identical. Anybody know what I'm messing up here?

  2. #2
    ups and downs
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    Is your BB shell 68mm or 73mm wide? Do you have any of the 2.5mm spacers installed now?

    If you have a 68mm shell you need 2 on the drive side and one on the non-drive side. That would be a 5mm difference between the 68mm and 73mm shell, or just about 1/4". What spacers did you have on your 960 bearing cups?

  3. #3
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    Well, If I'm measuring properly, it looks like a 68mm. I measured from the inside of both bottom bracket ends under the bike. It's a Trek Fuel 100. I have no spacers installed at the moment. The 960 crank had no spacers and both arms were flush. This is what really confuses me. So it sounds like I need some spacers then? and all 3 of them to boot?

  4. #4
    I wanna go fast!
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    Quote Originally Posted by togathrust
    Well, If I'm measuring properly, it looks like a 68mm. I measured from the inside of both bottom bracket ends under the bike. It's a Trek Fuel 100. I have no spacers installed at the moment. The 960 crank had no spacers and both arms were flush. This is what really confuses me. So it sounds like I need some spacers then? and all 3 of them to boot?
    Yeah, 2 on drive and one on non drive. They go between the BB shell and the BB bearings. Not to sound like a jerk, because that's not my intent, but you should read the instructions just to make sure...

  5. #5
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    Success!! I knew I was missing something simple. Trying to do too much at the same time was my problem yesterday. I added the spacers to the INSIDE of the BB THANK YOU!! Your not a jerk for mentioning the instructions!! I totally missed that. Thanks so much.

  6. #6
    I wanna go fast!
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    Quote Originally Posted by togathrust
    Success!! I knew I was missing something simple. Trying to do too much at the same time was my problem yesterday. I added the spacers to the INSIDE of the BB THANK YOU!! Your not a jerk for mentioning the instructions!! I totally missed that. Thanks so much.
    Glad I could help!

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