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I was just riding along
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Well it's certainly muddy, probably stripped the splines. New crank time - much prefer the most solid interface on the RF/SRAM cranks.
much prefer the most solid interface on the RF/SRAM cranks.
The only cranks my massive 65kgs have ever destroyed were RF. Despite being correctly fitted and torqued, alloy crank spider splines on steel axle splines eventually wear. Especially if used with one of RF's self-destructing BBs which no doubt adds to the load.
Shimano use a steel insert against a steel axle.
To be fair with the lens glare, mud and poor focus I'm only guessing at what the OP's problem is (unless we're supposed to be looking at the chain rings in which case it's focussed perfectly....)
Crank arms say its Half past 8
I was looking for a crack or some such in the dirt for a while
I think I may need new crank arms.
Nah a clean and a bit of Loctite will sort that*.
*may not sort it
Probably just the NDS crank arm. I did the same to a 105 was £22.50. Splines on the crank arm appeared significantly softer than those on the axle, so you should be in the same boat.
I thought the black scuff marks might be where it was installed by being hit with a rock.
My previous experience was both totaling themselves and the other case was once one worn the interface wasn't any good. Hence not running any these days.Splines on the crank arm appeared significantly softer than those on the axle, so you should be in the same boat.
Do the posher ones have lighter axles? I've seen 105 and XT fail at the crank arm, zero damage to the axle. My inner geek wants to visit the Shimano website now... But too tired.
THe question I now have to ask is would you pay £20 to save 40g of weight
Any weight weenie would tell you £1 per 2g saving is a bargain. Others may suggest it's an insignificant weight saving.
Have you actually taken off the crank arm to look at the splines?
I haven't yet I will have a look tonight.
Yes - what did it sound like?
I actually snapped an ISIS BB in half once which left me with two crack arms pointing at the floor - I took it back to Halfords with a look of WTF written all over my face only for the monkey behind the desk to take one look - make a blemface and say "duurrr you're meant to fit them the other way" as if I'd been riding about like that.
Honestly - I should have thanked him really, it was the last time I took a bike into a Halfords and took the time to learn was a LBS was.
Anyway, ramble over - when it snapped it made a noise like someone snapping a lamppost.
This made almost no noise it was a really strange feeling when it broke. The left hand spins independently with a feeling similar to a really really rough BB so I expect it is the splines.
home made power cranks. 😀
That William Morris wallpaper is a bit dated tbh.
The only cranks my massive 65kgs have ever destroyed were RF. Despite being correctly fitted and torqued, alloy crank spider splines on steel axle splines eventually wear. Especially if used with one of RF's self-destructing BBs which no doubt adds to the load.
This. I bought some Evolve XCs back in 2006 and they died within eighteen months (the warranty is twelve months). The spline interface isn't strong enough, I know a few people who've killed Deus and Atlas cranks the same way. RF bottom brackets might as well be made of cheese.
SRAM stuff is better but the BBs tend to die very quickly.