- XT Crank Fail
not the first time ive seen that
seen it before on oOOOLD xt cranks that had seen a power of miles – foot rub basically wore the front thin – but you could see it clearly – the photos above dont actually look so bad) and cracking initiated in the front judging by the colours of the material i was looking at – the rear of the crank was shiny and fresh broken the front was dull and grey looked like it had been going for a while.Posted 4 years ago
Half way through lap 1 of the Thetford Summer Enduro yesterday,I had an unexpected mechanical. I was prepared for most eventualities but not this…
I finished the lap pedalling with one leg, handed over to my partner and then rushed home to get another bike.
The cranks are a few years old now but I didn’t anticipate such a catastrophic failure.
(The chainring bolts are missing as I was in the middle of stripping it down.)Posted 4 years ago
Agreed, a lot of metal has worn away. The thing is, it isn’t something you expect….even after years of pedalling!
Ideally, some form of wear indicator would be a good idea but I have no idea how you would do it.
I’m not sure Shimano would be interested, as mentioned previously, they are hardly new. I’d just have preferred it if they had gone nearer the end of the lap! 🙂Posted 4 years agoRusty SpannerSubscriber
Ms S is a serial heel rubber and has some, ooohh, 7 year old XT on her Rock Lobster.
Is there anyway to judge effective lifespan?
How worn is too worn?
Northwind – Member
Enjoying the concern here, stuff breaks, if in 2013 you’re hearing about failures of what is I think a 2009 model (?) then it’s doing alright.
You think 4 years is an acceptable life span?
Wow. I would expect them to last pretty much indefinitely unless severely damaged or heel rubbed to hell.
Seen a couple of SLX do the same but then I think some people try to get SLX to do more than its paygrade.
Jumping/downhilling you mean?
If XC use, I’d expect them to last just as long as any other model of Hollowtech crank.
Lifespan isn’t model specific, is it?
Not trying to be funny, just interested.Posted 4 years ago
It’s more about amount of use rather than lifespan. I accept I’m a heel rubber, I don’t think there’s anything Shimano can do about that short of making 5kg solid cranks.
A wear indicator would be handy but I suspect ain’t gonna happen, so I guess the rule is if in doubt then get rid. The potential costs and consequences of a failure far outweigh the cost of replacement.Posted 4 years agoNorthwindSubscriber
Rusty Spanner – Member
Jumping/downhilling you mean?
Yup. Tons of SLXs on dh bikes- I got on fine with mine but then I weigh as much as a child.
Bear in mind here we’re not talking about a “4 year lifespan”, we’re just talking about a couple of items failing after 4 years, on a popular line. What’s the mean time to failure going to look like? Not 4 years, that’s for sure.Posted 4 years ago
3dvgirl – Member
Shimano will still replace recalled cranks from the mid 1990’s id contact them.Posted 4 years ago
Im happy to be corrected on this point, but im not aware of any recalls on Hollowtech cranks.
Besides there is a clear cause of why the cranks have failed. Is not a manufacturing defect, but a direct result of excessive heel rubbing.londonerinozMember
Measure from new and check occasionally seems very sensible.
Thankfully I’m not a heel rubber, but if I was I’d add cranks to the list of items that get replaced periodically to avoid a crash or injury in the event of age/use related failure, such as handlebars and helmets.Posted 4 years ago3dvgirlMember
Im happy to be corrected on this point, but im not aware of any recalls on Hollowtech cranks
no they were altus ones i think. I have just read the instructions for my crank it makes no reference to watch out for heal rub etc. like i said id contact them, if only for the sake of feedback, you might be surprised how interested they are.Posted 4 years ago
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