Do cranks have a lifespan?
It’s come to the time where I need to replace some drivetrain bits (currently 2×9) and I’m toying with the idea of going 1×10 after surprising myself at what I could get up with a 32t front this weekend. The swap is going to be fairly expensive, and a fairly big chink of that is going to be the cranks (£100 for an XT double).
So my question is do cranks have a lifespan? There’s no obvious sign of wear on my current ones apart from a bit of heel rub, but they must be coming up to five years old and I’d sooner replace them before they break for obvious reasons. They’ve been in pretty much constant use, though they are pretty meaty FSA Gravity jobbies.
So can I use that as an excuse to buy new shiny things?Posted 4 years agoConespannerSubscriber
My old square taper cranks are still going strong. I have a Suntour XC Pro which is 22 years old and is used twice a week as it is on my single speed and a middleburn RS7 which was purchased in 2000 so making it 14 years. I do have a youthful LX HT11 which is six years old so I’m not a complete old fart!!Posted 4 years agojonathanSubscriber
I think Hollowtech cranks are cold forged, starting with something tube like to get the hollow bit.
It is perfectly possible to wear through the side, but I think you need a very wonky pdealling style to do it. Ash (off of Trans Provence) clearly does…
I’ve seen quite a few broken cranks, but usually it’s either at the hands of serial component destroyers (very high mileage and very high power) or of lioghtweight construction (eg 90s era Middleburns). Never broken any myself, but I’m generally not a breaker of bits!Posted 4 years agotomasoSubscriber
Only Cranks I ever broke were Cooks Brothers Racing ones after doing a big drop – it actually snapped the Shimano bottom bracket but the reamaining axle jutting out was sharp and took a chunk of crank metal out and a crack formed. I wept as £230 of a CNC’d bike jewellery died…
Unless you do big big jumps I can’t see the heavy duty cranks you’ve got ever wearing out.Posted 4 years ago
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