I'm a bit unsure about lengthening a 10sp Ultegra chain once it's been shortened
Don't lengthen the chain once it's been shortened.
There's no 52/36 6601 chainset so I may have to bite the bullet and go 52/39
What about changing the rings on your existing chain set for aftermarket ones such as TA. Then you can make any combination you can purchase. You can probably E-Bay the existing rings as new to offset cost?
Don't lengthen the chain once it's been shortened.
What about changing the rings on your existing chain set for aftermarket ones such as TA. Then you can make any combination you can purchase. You can probably E-Bay the existing rings as new to offset cost?