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How strong are light weight cranks?
Posted: Tue Apr 09, 2013 5:32 pm
by Kayrehn
Was contemplating getting lightweight boutique cranks like THM clavicula stuff when I read the Storck powerarms user manual that says it is recommended that the cranks are sent back after 3 years to the dealer for a checkup in case the thing breaks down etc. So are such cranks (with weight limits to them) necessarily disposable after a number of years? I do feel that more mainstream carbon cranks like Sram and Campagnolo ones should be more lasting though, given that they don't come with weight limit or similar precautionary note, from what I know at least...
Re: How strong are light weight cranks?
Posted: Tue Apr 09, 2013 6:18 pm
by HillRPete
Well there's strength as in stiffness which is fairly well documented in the
FWB Crank Tests, and strength as in durability, which is hard to measure, because every rider uses and treats the gear differently.
Re: How strong are light weight cranks?
Posted: Tue Apr 09, 2013 6:18 pm
by Weenie
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Re: How strong are light weight cranks?
Posted: Wed Apr 10, 2013 4:10 am
by NiFTY
Any material can fatigue, be it carbon or otherwise. I am sure the 3 year service is a very conservative estimate.
Re: How strong are light weight cranks?
Posted: Wed Apr 10, 2013 6:32 am
by sugarkane
Not all lightweight cranks are equal...
THM recommend for their m3 cranks that you send em back for a refurb every 10 years or 100000kms
Re: How strong are light weight cranks?
Posted: Wed Apr 10, 2013 10:32 pm
by ras11
Aren't Storck cranks not also made by THM?!
Re: How strong are light weight cranks?
Posted: Fri Apr 12, 2013 3:01 am
by jmartpr
THM is the manufacturer of Storck PowerArms...they are basically the M3 model.
Re: How strong are light weight cranks?
Posted: Fri Apr 12, 2013 10:26 am
by latman
Carbon (w/epoxy resin) has no fatigue life and does not deteriorate with time , its weakness is the bonding to the threaded metal parts which can be affected a lot by temperatures especially due to expansion/contraction of Aluminuim inserts
Re: How strong are light weight cranks?
Posted: Fri Apr 12, 2013 11:54 am
by HillRPete
jmartpr wrote:THM is the manufacturer of Storck PowerArms...they are basically the M3 model.
Huh? M3 has a replaceable spider, whereas Power Arms don't.
Edit: good to know, thanks jmart.
Re: How strong are light weight cranks?
Posted: Fri Apr 12, 2013 1:40 pm
by jmartpr
Yes...that's basically the difference but the 30 mm alloy axle, arms and design is the same. They even use THM BBs which are sent on THM packaging. Storck contracts THM for various components like forks and cranksets.
Re: How strong are light weight cranks?
Posted: Fri Apr 12, 2013 1:40 pm
by Weenie
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starbike.com Online Retailer for HighEnd cycling components
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Re: How strong are light weight cranks?
Posted: Fri Apr 12, 2013 1:57 pm
by Geoff
SiSL are pretty light. They are also beefy as heck.