Point

For aesthetics I prefer the Csmpy Record of the 80’s, but 7410 is pretty nice. Looking at these failures, I feel good with my affection for cold forged, solid, square taper cranks.

Polaris OBark

Page 27: https://si.shimano.com/ru/pdfs/dm/RA...012-00-ENG.pdf

Racing Dan

So, how often can you go for an inspection? ..

Imo, the product lines are faulty by design and prone to delaminating. Thus, by not replacing every single crank they create a need for regular inspections of every non-replaced crank in the affected series.

PeteHski

If Shimano end up having to replace 760,000 cranks in the US alone, perhaps millions worldwide, then we can expect future Shimano supply issues.

Racing Dan

Sure. So what? By not replacing every affected crack, they are not solving the safety problem, unless they implement a routine inspection of every crank, for the life of the products. It appears they didn't outside of one initial inspection. Honestly its BS, leaving the customer in limbo, as soon he/she has had the one scheduled inspection.

Du you even trust your local dealer to accurately diagnose defects by eye? Who is liable if the crank breaks after the LBS deemed it good? Shimano, LBS or YOU?

jpescatore

I got the email from my bike shop last week, brought my 2017 Domane with 14,000 miles on it for the inspection. The next day they called back, their inspection, and theoretically Trek looking at photos, showed no delamination, etc. The claim is that the vast majority of the 1% of cranksets that failed did so within the first few years.

Definitely not clear what happens if it fails from here. The frame and fork have a lifetime warranty against manufacturing defects. With a recall out, I'll bet that will be true for these cranksets. But, having one fail while riding is something I'd rather avoid.

PeteHski

I’m just saying it might not be very practical to replace that many cranks and certainly not overnight. Inspecting them is a more pragmatic solution, given that 99% of them are likely to be fine.

In an ideal world it would be nice if they could just send out 760,000 new cranks, but I’m guessing that’s simply not an option.

PeteHski

The chances of it failing while riding are very slim, especially now you are likely to carefully check for any signs of delamination.

eduskator

Good thing the 12sp aren't part of this recall.

If I am not mistaken, they are also hollowtech. Does someone know what's different between the 12sp and 11sp?

Polaris OBark

Shimano, and their liability attorneys.

seypat

I agree. Unless they found something specifically defective such as adhesive, it goes back to a faulty design. The current approach is not increasing confidence on the consumer side.

aliasfox

I would hope that longer term, once they have the replacement cranks manufactured in quantity, that Shimano would offer a discounted replacement for affected cranks - ie, even if your crank isn't delaminating, you can take it in to your LBS, who will replace it for $100 with a (supposedly) safe crank. For anybody who's concerned it would offer peace of mind, and it would earn Shimano some goodwill amongst all of us that spent solid money on Ultegra and Dura Ace. Honestly, the best goodwill is to build something with bulletproof reliability in the first place, but I digress.

Considering I've been told what to look for, I'm ok with riding my cranks for now, but if Shimano doesn't:
a) take care of their customers
b) doesn't clarify what structural changes were made between late R-code cranks and later builds (including R71xx, R81xx, and R92xx cranks)

I can see a lot of people losing trust in the Ultegra and Dura-Ace brand names. I hadn't been planning on a new performance road bike, but given the newfound lack of trust, I'm entertaining the idea of getting something SRAM Red or Campy Chorus (or Record?) equipped in the next few months.

Trakhak

In one of the other threads on the crank recall, someone reported that since Shimano's factories are apparently no longer set up to produce 11-speed cranks, they're going to use different spacers to retrofit their 12-speed cranks as 11-speed.

eduskator

Read that too. From what I understand, 12sp have the ''Hollowtech II'' technology. I hope they figured out how to better bond their components. For what it's worth, I never had any issues with the 2 bikes I owned that were equiped with 11sp Ultegra.

PeteHski

They have all been named “Hollowtech II” since around 2004 when they went to external BB bearings.

eduskator

Oh, OK! Well, this confuses me even more as to what changed between the 11sp and 12sp Ultegra and DA that makes the 12spd not part of the recall. I thought they were manufacturing them differently now. May-be they're too recent or something.

genejockey 

It's not just 12 speed cranks that aren't part of the recall. It's also 11 speed made after July 2019, which seems awfully specific, which suggests they made a change in manufacturing technique during the run.

PeteHski

Hollowtech II is not a specific design. Just a marketing term for a hollow crank. The II was introduced when they went from “Octalink” to external bearings a long time ago. I’m actually surprised we are not on Hollowtech X by now!

I would imagine Shimano were well aware of this manufacturing issue with some of their 11-speed cranks when 12-speed was designed. So I presume they tweaked the process to avoid the issue. Time will tell.

spelger

my crank is not in the recall group (yet), but regardless i'd like to know what a failing inspected crank (that was otherwise considered ok by the user) looks like just so i can look out for any signs.

bonsai171

Not sure mine fits the failing category, but I have the 6800 crankset. My LBS looked at it, and their main criteria was looking for fissures, but noticed the spider sat uneven on one of its arms, and sent it to Shimano. From there, the dealer says Shimano will inspect it and replace it, or if they think it's ok, send it back. Guess we will see soon.

Dave

malcala622

I've got DA 9000 on my Bianchi. I inspected it myself but ill have to keep an eye on it from now on.

cat0020

Investigating Shimano’s snapping cranksets:
What happened, unanswered questions and an engineer's report

https://road.cc/content/feature/inve...anksets-304173

malcala622

Alot of the pictures I've been seeing of snapped cranksets I've noticed a few things.

1. The chainrings are super worn out.
2. There's some extensive shoe rub on the crank arms.

Both these would contribute to fatigue in cranksets. Just my observation and in no way am I saying shimano is in the clear.

choddo

Surprised that article doesn’t mention galvanic corrosion

bblair

I took my bike in last week, 6800 series groupset. No visual problems, but neither of us wanted to leave the bike at the shop during prime fall riding season.

We're traveling in December and it is often too cold and wet to ride anyway. I'll have them do the full deal when they do my seasonal refresh.