Another Shimano Crank Failure & the New Design

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[wazzup]

"I'm getting my shaft out of Hambini"... pure bro love !

[Hambini]

In case anyone was in any doubt, it's my bottom bracket in that bike. And it's as tight as a coke can in a toilet roll holder.

[dtacto]

You may have a problem if…you keep a shimano preload tool on your keychain

[valmorell]

Glued cranks seems daft to me. Will stick with the forged items and accept the small weight penalty.

[shankeong]

if anyone is interested, one can accelerate the debonding process by just dunking your cranks in water with electrolytes and alternating that with sessions in the oven.

[feedbackzaloop]

Funny how "getting the right crankset" no longer refers to the one that actually doesn't break.

[darrenhitchcox]

I had a Dura Ace 9000 crank crack across the line where the top of crank boot would fit. Was not obvious and needed a magnify glass to confirm. Shimano replaced all including chainrings. I warrantied mine when the recall started and took 3 months to get the replacement

[watsonthedog]

talked to our shimano rep a few weeks ago about the crank failures and what all is different on the new cranks and you're absolutely right about the waterproofing being the main thing they focused on :)

[nonsequitor]

Another "improvement" to cycling 🙌.... Can't wait to see what the marketing team thinks up next I'm almost not bankrupt yet.

[cxbkpmf]

Too bad Shimano won't allow crank length substitutions. It seems this would be a nice bone to throw us for having to deal with it.

[jimbo]

The new cranks are simply Ultergra 8100 12sp cranks however the rings had to be specically made for the recall. The reason being the entire shimano 12sp group has a chainline that sits 2mm further outboard to clear newer wider chainstays, this means the spider on the 8100 crank sits 2mm further out. A new chainring had to be developed to compensate for this and maintain the original 11sp chainline. This is why the new chainrings are not compatible with the older cranks and vise versa as it will totally mess with chainlines. Shimano say they are going to stock just the new chainrings as a spare part for when these rings wear but am yet to see them available on their own.

[borano]

HAMBINI BOTTOM BRACKET!!! Got the message alright... Rgr

[ChrisWagner-bhvn]

people give me a lot of crap for cleaning my bike/components after every ride, I call it preventive maintenance, my point is that one will more likely find damage/defects when the bike is clean. I've never had a frame or crank fail on me while riding, knock wood, thanks for the vid.

[marcelknop]

Shimano have known about this for years. I had my road bike 6800 crank set fail in Aug 2016, with just 15000km on them. It failed at the drive side crank arm bonding. The first hint I had was that I thought my pedal axle was bent, even though I had no fall at all on those cranks. I was looking down to see if I could actually see a bend in the pedal axle and noticed that the Crank was bending under load. Closer inspection revealed a complete bonding failure of the crank arm bonding, all the way up to the Spider, including the spider as well. I suspect the redesigned spider of the next ultegra series was a result of multiple failures. I had a few friends also subsequently have similar failures.

[mtd]

Took my 8 year old 6800s to the shop without rings, and after a few weeks simply got a call what rings used to be on there - could've told them anything I wanted, if I fancied a change. Also had creaking and the exact same failure spot, but much much smaller opening. Still replaced without question after about 10 weeks.

[fraserherman]

Add some blue thread locker to those chainring bolts as all mine backed out. One of them came out far enough to gouge my frame 🤬

[dannbdge]

I had two R8000 cranks replaced.
My LBS took the chainrings off to inspect and asked if I wanted them back.

The new cranks came with new chainrings and I got to keep the old ones (they were barely worn, so I sold them for £40/50 ea).

[hrdcor]

How many creeking bottom brackets could actually be traced back to Shimano Cranks? Has the cycling community been duped into a bad meme for years?

[luketoms]

As far as I know, they only ship with new chainrings. I5s a pretty quick turnaround now should only take a couple of weeks to have your replacement crank. I've only seen 4 replacement cranks in my shop

[fleurdelispens]

Your british sports car panel gap joke is out of date. It should be cyber truck panel gap