Viewing 24 posts - 1 through 24 (of 24 total)
  • Need a new left side Crank arm Shimano Hollowtech style
  • Premier Icon DenDennis
    Free Member

    Hi, please can you direct me to where I might be able to buy a new (left side) crank arm?
    I’m still old school I’m afraid, so rather than buying a whole new crankset I’d like to get equivalent spare that would fit. 175mm length.
    existing crankset is/was SLX M660, triple (thought I converted drive side to 1×11). anyway, yesterday I managed to strip the pedal out of the threads in the non-drive arm.
    I’ve looked online and the vast majority seem to all be “E-bike specific” whatever that means, unless I’m spending upwards of 100 quid, whereas I was hoping to pick up something for 30-40?

    I just need a good old simple shimano hollowtech compatible left arm- could be Deore or XT or whatever….

    Or Are the ‘E-bike’ specific ones basically workable on left side anyway I wonder?

    Thanks in advance

    Premier Icon chakaping
    Full Member

    Hopefully you can find someone with a knackered drive-side arm to sell you their NDS.

    I could have helped if you were after a 170mm one.

    Premier Icon DenDennis
    Free Member

    yeah cheers. Its the sort of thing I might have had spare too…
    will ask in a couple of LBSs also.

    Premier Icon acidchunks
    Full Member

    Bit short on supply with the usual suspects but this may do the trick

    https://www.hargrovescycles.co.uk/components/gears-drivetrain/shimano-deore-fc-m590-left-hand-crank-arm-in-silver–175-mm__18990?currency=GBP

    Its from a 9 speed groupset but should be ok. I bought one of these in black to replace a snapped left arm from a 10spd deore set and it worked fine.

    Premier Icon mashr
    Free Member

    anyway, yesterday I managed to strip the pedal out of the threads in the non-drive arm.

    Have you thought about just getting the thread fixed (tapped and inserted)?

    Premier Icon poah
    Free Member

    Got one from bikester when I did the same thing.

    Premier Icon chakaping
    Full Member

    Have you thought about just getting the thread fixed (tapped and inserted)?

    On a related note – can you get the threads in crank bolt-holes repaired?

    Premier Icon mashr
    Free Member

    On a related note โ€“ can you get the threads in crank bolt-holes repaired?

    The big self-extractor thread? No reason why not. Just need someone with the right tools, so might be a local engineering place rather than LBS

    Premier Icon chakaping
    Full Member

    The big self-extractor thread?

    Nah, the M7000 SLX chainset had threaded holes to put the chainring bolts in – and they must have been prone to stripping out ‘cos they swiftly moved to direct mount for the next version.

    Premier Icon mashr
    Free Member

    Probably even more likely then tbh. Just need to know the thread size and thereโ€™ll be an insert available

    Premier Icon stefanp
    Full Member

    I think I have one – I’ve got an assortment of half knackered cranks! I’ll check after work for you.

    Premier Icon savoyad
    Full Member

    @DenDennis – try the guy who does a repair on ebay, “Bicycle crank arm pedal thread repair service (for stripped/damaged threads)”.
    I had a spate of this issue (the history is here on the forum somewhere…) a few months back I’m happy with his service. My LBS said it was unrepairable and tried to sell me a new crank. They were wrong.

    Premier Icon schmiken
    Full Member

    I can fix that for you! Drop me a PM ๐Ÿ™‚

    Premier Icon n0b0dy0ftheg0at
    Free Member

    Hollowtech style? Sorry, thought you meant…

    ๐Ÿ˜†

    Premier Icon mikeyp
    Full Member

    I have a 175 m760. PM me if you want it.

    Premier Icon chakaping
    Full Member

    I can fix that for you! Drop me a PM 🙂

    Was that aimed at the OP or me?

    Premier Icon martinhutch
    Full Member

    Nah, the M7000 SLX chainset had threaded holes to put the chainring bolts in โ€“ and they must have been prone to stripping out โ€˜cos they swiftly moved to direct mount for the next version.

    Seems possible.

    Premier Icon johnnymarone
    Free Member

    Ive got one spare , in black, marked up as FC-M442/443 , think it came off a Mongoose Teocali ages ago. Its yours for the postage, I was due to bin it this week anyway.

    Premier Icon schmiken
    Full Member

    I can fix that for you! Drop me a PM 🙂

    Was that aimed at the OP or me?

    The OP!

    Having said that, I’m sure its possible to helicoil and repair the holes the crank bolts thread into. Would need to double check the pitch and depth, but Im sure there is a suitable tool available to do it.

    Premier Icon johnnymarone
    Free Member

    I have repaired one of these before, for a workmate.I just bored out the damaged threads, turned up an insert and tapped it the correct thread, or maybe I thread cut it on the lathe. Anyway, nice tight fit and a couple of dutch keys to prevent the bush rotating in the crank arm and by all accounts it worked for years with no problem.

    Premier Icon DenDennis
    Free Member

    Cheers all for recommendations and advice.
    Just to show the bit I’m after, it’s this version of hollow tech BB crank.

    slx crank arm

    Out of interest, do the newer 1×12 Shimano direct mount cranks fit onto the same screw in BB cups?

    Premier Icon chakaping
    Full Member

    Yes they do.

    Premier Icon DenDennis
    Free Member

    Cheers chaka, so if it came to it I could use old BB cups and fit new full 1×11 chainset or at least just the left arm?

    Premier Icon DenDennis
    Free Member

    MikeyP top man, arm arrived in post today! Thanks

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