component dropped off, what's it called?

by kayakboyuk   March 14, 2012  

Hey,
I recent got a new set of cranks/front rings. Working well but then I noticed a part had dropped off then the left arm began to come loose. Thing is I don't know what it is called to look for a replacement. It is the central screwed cover for the hole on the left hand side. Just unscrewed itself and disappeared. The cranks are made by FSA.

Any ideas guys?

thanks Graeme

5 user comments

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It's the crank preload bolt. By the sounds of things.

posted by thereandbackagain [152 posts]
14th March 2012 - 18:51

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that will be a vertical dropout... sorry, could not resist Smile

roadie come mountain biker come single speeder and back again

posted by cborrman [84 posts]
17th March 2012 - 22:04

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http://www.google.co.uk/search?q=fsa+crank+bolt&rls=com.microsoft:en-GB:...

look like any of these? depending on what crankset you have....

posted by Lost faith in t... [119 posts]
18th March 2012 - 14:44

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Yep,

Like this
http://www.wiggle.co.uk/fsa-left-hand-crank-bolt/
but silver

Thanks, will make sure everything is good and tight!

Only good at sitting-down sports

posted by kayakboyuk [41 posts]
18th March 2012 - 17:31

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kayakboyuk wrote:
Yep,

Like this
http://www.wiggle.co.uk/fsa-left-hand-crank-bolt/
but silver

Thanks, will make sure everything is good and tight!

This is the fundamental problem with this crank design - you can't really tighten it too much, as it's only there to pinch all the components together and take any play out of the assembly. Too much torque and you'll damage the BB bearings. The bolts on the LH crank are the things that need to be done up tight.

I'd recommend that you put some threadlock onto the thread of the preload bolt to stop it working lose. It may have some pre-applied, but more won't hurt.

posted by thereandbackagain [152 posts]
19th March 2012 - 18:31

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