replacing cranks

pdrolo
pdrolo Posts: 127
edited June 2008 in Workshop
when fitting new pedals I have cross threaded the crank on the left pedal - guess I need a new crank - its my winter bike - decathlon 7.1 sport - what do I need to buy ? - both left and right or just the broken one ? - what do I need to do to ensure compatibility ?

and budgets crank recommendations welcomed
Roadie with an MTB

www.cyclestuff.org.uk

Comments

  • SteveR_100Milers
    SteveR_100Milers Posts: 5,987
    In my search for a complete new front end chainset and bottom bracket, I have seen a few ads on t'internet for left had cranks only.
    http://www.pontypoolrcc.co.uk/
    www.facebook.com/group.php?gid=44397853765
  • W5454
    W5454 Posts: 133
    Your LBS should be able to sell you a LH crank.I had to cut a crank off a spindle last year and got a spare.It was a chunky thing so I filed and polished it to the shape of the RH crank,as near as I could.Since it was for my commuter I wasn't too fussy about an exact match.
  • bmckeon
    bmckeon Posts: 6
    Would it be possible to use a Tap (or is it a die, I can't remember) to re-thread your crank? I picked us a set of taps and dies for €8 in Aldi a few weeks ago.
  • W5454
    W5454 Posts: 133
    bmckeon wrote:
    Would it be possible to use a Tap (or is it a die, I can't remember) to re-thread your crank? I picked us a set of taps and dies for €8 in Aldi a few weeks ago.

    The taps you bought in Aldi will be a metric coarse thread.To tap your crank you need a 9/16" cycle thread tap from a specialist supplier like this:
    http://www.tracytools.com/
    Also if it's the left hand crank you'll need a tap with a left hand thread.These are about 3 times more expensive than a right hand thread tap.
    Depending how damaged the thread is it might not be possible to re-tap it.
    Much easier to buy a new crank.

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