currently using a 105 5800 rear mech and having some issues, as per thread below. I am wondering if £40 at CRC on a medium cage 6800 Ultegra one will solve it. I need medium as with 50-34 and 11-32 I am on 37T. Main question, apart from compatibility, is does the Ultegra have a stronger spring than the new 105 ?

currently full drivetrain/STI’s are 11 Speed 105

here

As per other thread, no way will a new mech will sort the issue, a regrease or new hub might.

But just don’t back pedal hmmm’k?

Thanks Al

I agree with Al, wasting your money.

thanks njee20, will hang off and have a chat with LBS tomorrow who want a look at it