Swapping R8000 Cranks for 6800

[charliedid]

I was gifted a set of cranks by a customer and just curious (someone mentioned maybe not the same) if these are a plug and play swap?

R8000 everything else

Thanks

[benb]

Wait you have 8000 and you would put the 6800 on?

Make sure the 6800 are not in the recalled block, if they are that's a serious downgrade. Apparently not all of them are recalled, it depends on where and when they were manufactured, but anything in the block would not be anything you'd want to put on a bike IMO. The backstory here is Shimano is replacing only the ones that are currently cracked, but they might all eventually crack, Shimano just doesn't seem to have enough stock to replace them all immediately. Cranks seem in short supply if you start trying to buy them online too as lots of people probably replaced their cranks if Shimano didn't give them new ones.

I do believe they are compatible though. They are both 11 speed.

I have a 6800 on a bike with 10-speed and that is 100% fine as well.

[Alistair]

Same spindle. Don't recall if they're the same bolt pattern (not sure when Shimano went from 110x5 to the asym 4-bolt).

[benb]

6800 is 4-bolt.

[charliedid]

Thanks I did the responses so far. Fully aware of all that has been stated. I want these because 165mm.

A coworker not here today mentioned something about distance between rings not being same. I should have mentioned originally.

Make sense?

[NYCfixie]

Originally Posted by charliedid

Thanks I did the responses so far. Fully aware of all that has been stated. I want these because 165mm.

A coworker not here today mentioned something about distance between rings not being same. I should have mentioned originally.

Make sense?

They are both 11 speed and the cassettes/chains are interchangeable so the crank rings should be too. AFAIK, there is not difference on ring spacing for those cranks.

[slambers3]

6800 and 8000 are functionally interchangeable. Same ring BCD but the rings have some aesthetic differences. 6800 series cranks will be affected by the recall, running them seems like a risk at this point.

[Gummee]

Originally Posted by Alistair

Same spindle. Don't recall if they're the same bolt pattern (not sure when Shimano went from 110x5 to the asym 4-bolt).

I think the only difference is in the shape of one of the arms where it interacts with the rings

Otherwise same same

M

[charliedid]

Thanks for all the reply and concerns for my safety but I'm fine running them and my R8000 fully check out IMO not worried about failure.

I'll look into it further in terms of the spacing between big and small ring comment.