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  • Would you trust a HTII crank that has slipped on its splines?
  • Premier Icon mtbtomo
    Free Member

    I forgot to tighten the pinch bolts on a HTII chainset and it slipped round the splines when i rode it.

    I’ve refitted and tightened and had a brief ride in some high gears to try and provoke it.

    Seems ok, but should i trust it? Don’t want to get caught out miles from home.

    Premier Icon tony07
    Free Member

    Did the exact same about three years ago on a home crankset. They’re still going strong with no issues

    Premier Icon cyclistm
    Full Member

    Never seen one slip round. I’ve had one fall off before.

    I’d check the splines carefully and if undamaged Id ride them

    Premier Icon maxtorque
    Full Member

    Pop the cranks off, and take a close look at the splines and in particular to see if any material has been removed from either part. With the pinch bolt fully loose, the crank arm should just “Open up” and slip relatively easily around over the splines without too much damage. If the bolt was tight, but not tight enough, then there is a chance the splines will have been damaged. It should be obvious if there has been damage as the “swarf” should be jammed in there still!

    Premier Icon Garry_Lager
    Full Member

    If it came loose and just slipped off the splines then that sounds like nae bother – that must be the case as if you’d really mashed the crank round the splines you prob wouldn’t be able to re-fit it, not so it worked anyhow.
    If it feels solid, no play then I’d go ahead with it.

    Premier Icon Simon
    Full Member

    I had some XT cranks that came loose on a ride. I tightened the pinch bolts up but they just kept coming loose and I had to stop using them.
    I’d had them a few years and they’d seen plenty of use.

    Premier Icon Blazin-saddles
    Free Member

    I’ve done it on a road crank. nipped up the pinch bolts, it was fine.

    Premier Icon mtbtomo
    Free Member

    Yep, that’s it. The pinch bolts were totally loose (road crankset) – I’d preloaded the bb with the top hat cap, but must have been distracted before tightening the pinch bolts. Its not that they weren’t tight enough, I just hadn’t even put an allen key to them.

    A fair bit of metal dust but as I say, it seems fine now having tightened it properly.

    Premier Icon D0NK
    Full Member

    Chances are the Ali crank arm splines will be damaged rather than the steel axle so a none driveside crank arm would be an idea, I got an XT one a few years back, can’t remember how much but must have been reasonable if I bought it. Same thing happened to me as Simon, the cranks are still going strong.

    Premier Icon Rorschach
    Free Member

    I did my xtr960 ones about 4 years ago.Bit of nifty work with a file to clean up the splines and they’ve been fine (I use an alloy pre load bolt now though!!!)

    Premier Icon mtbtomo
    Free Member

    Well, I did chaingang tonight and it seemed fine. One of my shifters slipped on the bar instead. Balls.

Viewing 11 posts - 1 through 11 (of 11 total)

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