NEXT carbon cranks

[binner]

I have a problem, is there a brains trust for these cranks?.... esp driveside

 

[Oddjob]

Whats wrong?

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[binner]

drive side is slipping between crank and axle...as in crank arm has about a 2mm slip on force down on pedal stroke...

 

[Ultra Lord]

Throw ‘em out and get shimano.

 

[binner]

yes ..ive torqued and checked all , i think the inner alu cog has come away from the carbon part of crank

 

[binner]

Throw ‘em out and get shimano.

yeah ok...will do

 

[bear the bear]

Worn spline/ worn interface, not enough weetbix?
If the insert is loose, should be an easy check off the bike

 

[Scotty675]

Think it's time for your NEXT set of cranks.

I do run a set but never had an issue though.

 

[k3n!f]

Anything like this? Is the carbon crank arm slipping on the metal insert?

I just tried to get a set warrantied as the pedal insert came loose. Very well known issue but the warranty was declined as they were a few months past their warranty date. Very disappointed.

 

[binner]

yep,that's it.....thanks man ................ well, hang wall time

 

[moorey]

yes ..ive torqued and checked all , i think the inner alu cog has come away from the carbon part of crank

I have the same issue with a set of SRAM GXP carbon cranks (S1000 maybe) I bought years ago for a kid build. They feel like you can tighten them. 5km they come a bit loose and get that slop. I think the interface in the crank is slightly stretched.

I have a tube of liquid metal I’ve always planned to try...But I’m just not that attached to the cranks.

 

[binner]

I have the same issue with a set of SRAM GXP carbon cranks (S1000 maybe) I bought years ago for a kid build. They feel like you can tighten them. 5km they come a bit loose and get that slop. I think the interface in the crank is slightly stretched.

yeahh, i think i got my 3 yrs out of them...

 

[moorey]

yeahh, i think i got my 3 yrs out of them...

Better than my 3km.
I’ll try the liquid metal one day though.

 

[hifiandmtb]

Follow my experiment - Gorilla Glue!

Liquid Nails was a disappointment.

 

[The Duckmeister]

Although I'm mostly a defender of the carbon faith, there are some things the stuff isn't good for, and cranks are one of them.The bonded-in pedal and spindle interface blocks are subject to too much offset loading to ensure a long-term reliable joint, with precicely the types of failures noted above.

 

[link1896]

Although I'm mostly a defender of the carbon faith, there are some things the stuff isn't good for, and cranks are one of them.The bonded-in pedal and spindle interface blocks are subject to too much offset loading to ensure a long-term reliable joint, with precicely the types of failures noted above.

Yes but RF carbon crank failures seem a lot more common then sram carbon crank failures and there are a lot of sram cranks out there.

Same scenario as Giant carbon Anthems.

No data, just gut feeling here.

 

[komdotkom]

Same scenario as Giant carbon Anthems.

Lol, fucking Anthems.

I think I'm off the carbon crank cool aid now too, me E13 TRS cranks are starting to creak and are only marginally lighter than my XT cranks.

 

[Haakon]

I had carbon cranks on my carbon anthem for years. They both were awesome and zero trouble... Straight pull spokes on it didn’t break either.

 

[Oddjob]

Just saw a guy this morning with a busted XX1 crank. Whole end of the arm had delaminated and alloy insert pulled out.

Carbon cranks are risky kids.

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[moorey]

I had carbon cranks on my carbon anthem for years. They both were awesome and zero trouble... Straight pull spokes on it didn’t break either.

All this is just a window into your riding.