Hollowtech Crank
- Thread starter awol
- Start date
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I'd suggest spraying the inside with waxoyl spray or similar regularly as they are apt to rust internally, pit and then shear.
I think plastic end caps would likely trap the moisture in rather than keeping it out.
I can't help on the other question.
I'm pretty sure that Alan Farrina would have said the same right up until the day his sheared.
For the sake of a quick spray inside once a month -- say a £10 can a year -- I'd rather that effort than end up under bus if it let go in traffic.
Maybe he was unlucky, but it doesn't seem to be an isolated incident.
Over reaction to a rare occurrence, there are millions of Hollowtech's in use.
Nothing in your link suggesting any major issue or problem.
Any failure is most likely contributed to other factors such accidental damage leading up to a failure, bearing failure or a manufacturing fault.
He's a small sample of hollowtech II failures findable on the web. All separate, all verifiable. Many severe injuries. At least one death.
A small percentage of those is use; and if those odds are acceptable to you, ignore this.
If not, an ounce of prevention just might save you from becoming a statistic.
Hard to see what the user could have been done to prevent those catastrophic failures.He's a small sample of hollowtech II failures findable on the web. All separate, all verifiable. Many severe injuries. At least one death.
A small percentage of those is use; and if those odds are acceptable to you, ignore this.
If not, an ounce of prevention just might save you from becoming a statistic.
No amount of lube will stop a crank shearing, and even with the broken axles it doesn't looks as if corrosion played any part.
Possible the axle somehow seized, but once again lubing the tube internally wouldn't stop that.
Most of those crank failures a shear failures. Shear failures start with stress risers. Rusting causes pitting.
Waxoil is not "lubrication", but rather a rustproofing fluid used to prolong the life of steel. It works by excluding water and air from bare metal and by slowing the progress of existing surface rust using phosphoric acid rust inhibitors.
No rusting, no pitting. No pitting, no stress risers.
Seems to me unlikely painting any fluid on those cranks would have prevented them shearing.
The axle failures are a bit more complicated, but I reckon the tube is simply not strong enough as manufactured to resist the various forces applied to it.
Painting it with something is not going to make it stronger.
Most of Shimano's kit is decent, but the company does have a track record of using buyers to beta test products.
Alfine 11 hubs and eMTB motors are just two examples.
I don't pretend to be a Hollowtech expert, but I bet the latest ones are strong enough to do the job.
The axle failures are a bit more complicated, but I reckon the tube is simply not strong enough as manufactured to resist the various forces applied to it.
Painting it with something is not going to make it stronger.
Most of Shimano's kit is decent, but the company does have a track record of using buyers to beta test products.
Alfine 11 hubs and eMTB motors are just two examples.
I don't pretend to be a Hollowtech expert, but I bet the latest ones are strong enough to do the job.