Viewing 23 posts - 1 through 23 (of 23 total)
  • Help! How do I get cranks off a square taper BB?
  • Premier Icon ononeorange
    Full Member

    I have removed the crank bolts; several minutes of gentle tapping progressing up to belting the hell out of the crank arms with a rubber mallett won’t even shift them.

    Am I missing something? Help please!

    Premier Icon g-dawg
    Free Member

    You need a crank puller

    Premier Icon swisstony
    Free Member

    Premier Icon boxelder
    Full Member

    tool

    Premier Icon boxelder
    Full Member

    Damn you swissies are good……

    Premier Icon postierich
    Free Member

    old skool innit! 🙄

    Premier Icon fingerbike
    Free Member

    Need a crank extractor:
    http://www.chainreactioncycles.com/Models.aspx?ModelID=7329

    Or middleburn do some neat self extracting crank bolts:
    http://www.middleburn.co.uk/access_crankbolts.php

    Funnily enough, a couple of days ago I overheard a guy chatting to his mate about a bike that came to the shop he works at (not sure which but seemed like halfords) with square taper cranks that needed removing, he didn’t once mention a crank extractor, did mention using a screwdriver, hammer etc. and then said ‘thank god for Hollowtech on new bikes, makes taking the crank off so much easier’… 🙁

    Premier Icon CountZero
    Full Member

    you need an extractor tool of some sort, or Q/R bolts for all cranks, not just square taper.

    Premier Icon richcc
    Free Member

    Crank extractor assuming you don’t want to knacker anything. If you don’t care then take out the Allen bolts and ride it around a bit inc. standing on pedals and they’ll probably loosen enough to get off.

    Premier Icon Tracker1972
    Free Member

    Where are you ononeorange? (can borrow if near)

    Premier Icon ononeorange
    Full Member

    Thanks everyone (apologies, my pc keeps dying).

    I’m in South Chilterns (Jct 18 of M25) – that’s a really kind offer Tracker1972. It’s a pain that I don’t have a tool as I’m secrtetly building a bike (transferring parts) for Mrs ononeorange and was hoping to really get a lot done this weekend.

    Premier Icon Tracker1972
    Free Member

    Would be kinder if you were closer to Chesterfield 🙂 You can get ones that use a couple of spanners, am sure most bike shops (including Halfords) carry them for a few quid.

    Premier Icon 4ags4
    Free Member

    I’ve one you can borrow – i’m not too far away (J16 M25)
    e-mail me if needed.

    Premier Icon nukeproof
    Free Member

    Back in the day (…and not everyone may recommended it!), if I had to get my square taper cranks off, I’d remove the crank bolts and then pedal around for a bit until they came loose. Just an option 🙂

    Premier Icon ononeorange
    Full Member

    Thanks again.

    4ags4 – you’ve got mail.

    Premier Icon MrOvershoot
    Full Member

    I’m not being funny ononeorange but if you didn’t know you need a crank extractor to take a SQ taper crank off what were you going to attempt afterwards?

    Premier Icon ononeorange
    Full Member

    Fair point Mr Overshoot. I plead guilty to the charge of being ham-fisted and inept.
    In my defence, I’ve never touched SQ taper cranks before. I have always had Hollowtech and assumed that her old bike were the same. I then assumed you just tapped them off, which didn’t work….hence the post, following a lot of head-scratching in the garage. There must be a first time everyone has tried to remove them once. Do I get a reduced sentence?

    The crank extractor works well, doesn’t it? Easy!

    Premier Icon MrSalmon
    Free Member

    I’ve just managed to strip the threads out so can’t use a crank puller- will try this just riding around tip 🙁

    Premier Icon Northwind
    Full Member

    “Back in the day (…and not everyone may recommended it!), if I had to get my square taper cranks off, I’d remove the crank bolts and then pedal around for a bit until they came loose. Just an option”

    This works. Though it’s much more effective if you don’t actually know the crank bolts are missing, it takes ages if you’re doing it on purpose but they fall off instantly if you’ve just forgotten to fit them :mrgreen: It makes sense just to loosen the bolt though, that way the crank will come loose without actually dropping off.

    Usually so does a rubber mallet, though you have to hit the crank as close to the BB as possible to have any chance.

    Premier Icon johnners
    Free Member

    The

    just riding around tip

    will knacker the taper.

    Premier Icon MrSalmon
    Free Member

    The

    just riding around tip

    will knacker the taper.

    I know, but the BB’s knackered anyway. It’s a Deore drivetrain that I was running into the ground before converting it to singlespeed, which was today’s job before I stripped the threads! It’s annoying because I was going to use the cranks but everything else was headed for the bin anyway.

    Premier Icon johnners
    Free Member

    The steel axle on the knackered BB will come out of it fine, it’s the softer alloy of the cranks that’ll suffer.

    Premier Icon MrSalmon
    Free Member

    Riding around didn’t work anyway, but turns out a mate has a gear puller which might do the trick.

Viewing 23 posts - 1 through 23 (of 23 total)

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