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replacing crank set/ bb on Specialised Sirrus Sport 2006

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replacing crank set/ bb on Specialised Sirrus Sport 2006

Old 10-22-15, 04:42 PM
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squibble
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replacing crank set/ bb on Specialised Sirrus Sport 2006

Hi all,

I'm a commuter using a Specialised Sirrus Sport 2006. Although there were probably warning signs that I failed to notice, out of the blue last night my right peddle started feeling awfully weird under my foot. Turns out the thread in the right crank arm is completely gone and the peddle thread was just wobbling around inside (peddle thread is fine).

So... I'm looking to replace these cranks I guess. I would like to have a go myself but am a bit unsure of what I should be looking for. I'm aware that as a slightly older style (although not ancient) some parts may now be obsolete/ no longer produced. Specialised website gives the following specs for this model (appropriate year):

BB: TH Sport, square taper, 68mm shell, 113mm spindle, sealed cartridge
crankset: Sugino Comp, polished arms

First option is to replace just the cranks I guess (since the bb is fine as far as I'm aware). What measurements should I be looking at to make sure the cranks fit onto my bottom bracket? Does getting new cranks basically mean I have to get new chain rings? And would that in turn mean I have to reconfigure my chain setup/ chain type or can I just make sure I get the same tooth-number chain rings?

If I can't find cranks to fit then I guess I'm looking at buying a whole new BB w crankset? In that case, what is the most important measurements/ dimensions to look out for here?

Would really appreciate any input/ advice able to be offered. Many thanks!
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Old 10-22-15, 04:57 PM
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As an alternative to replacement you can have the threads repaired by insertion of a Helicoil insert; the new threads will be stronger than the original ones.
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Old 10-22-15, 05:02 PM
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Yes, find a shop that can do a Helicoil repair - less expensive and better than new.
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Old 10-22-15, 05:44 PM
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Okey dokey I'll look into that helicoil, thank you! Otherwise if that's not an option, any advice on the other options? Cheers.
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