Bottom Bracket Selection Guide
TECH TIP: Ultegra and Dura Ace Crank Failure Diagnosis
It is the cycling equivalent of driving along the highway in a two-year-old Toyota Tundra TRD when suddenly the engine falls out. Shimano Hollowtech 2 crank sets are an amazing value, and we love them, and ride them, but what's with the crank failures? Most shops have seen this by now: Somebody riding along and suddenly the crankarm delaminates. It's mostly Ultegra cranks, and then there are plenty Dura Ace crank failures too. As interesting as it is to delve into the reasons why it's happening from a manufacturing and engineering standpoint, we think what you really need to know is how to spot if your crank is going bad on you. Enjoy the video. BBInfinite is here to solve the bottom bracket creaking and squeaking that's ruining you ride. BBInfinite doesn't just fix a bottom bracket creak, we deliver the highest spin performance of any bottom bracket system out there. Faster and creak-free? Absolutely, with BBInfinite.
There have been a lot of Shimano cranks failing lately and they can fail rather catastrophically- doesn't really happen on 105 and a lot of the other cranks like this DXR. It's not bonded together at all; It's really only happening in the Dura-Ace and Ultegra cranks. Like especially the R8000 cranks and if your bike is creaking and you have one of these crank sets okay it is it's imperative that if it's creaking you need to address it at the very least you need to inspect the crank to make sure that it is not cracking now I was I like to use the method of just tapping on it and I can hear there's a big difference between that one which is delaminated and this one that's not see how that's that high pitched ring not everybody that doesn't work for everybody so what you really want to look for is around where these bonded edges are you want to look for cracks stress cracks that might be starting because if this has come on bonded at all if it's bonded well over here and unbonded over here it could open up a stress crack in between them if you're having a creaking issue this is one of the things you need to look at and if you don't inspect it for a long time it could start opening that big crack and next thing you know like a big chunk of this crank is hanging off the end of your shoe and you're trying to ride down the road
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