5

I want to replace the chainrings of a group set Shimano Ultegra FC-6703. Unfortunately, I can't find the external chainring anymore. Can I use an external chainring FC-6700 (two-speeds) to replace an external chainring FC-6703 three speeds? According to bikeimport.ch the bolt distances are the same.

1 Answer 1

6

The FC-6703-specific 52-tooth outer chainring is Shimano model number WP-Y1LK98030.

The FC-6700-specific 52-tooth outer chainring is Shimano model number WP-Y1LJ98150.

Yes, the FC-6700 outer chainring will bolt up and would likely work. However, the difference in the model number indicates a difference in the part, likely the positioning of the shifting ramps (I have seen a similar difference in a Shimano big ring before where logic would seem that it should not be, but Shimano does what it does for a reason). If indeed the ramping is different, the shifting could be affected negatively, but I stress the "could."

As for availability, I have found two locations with the 52-tooth FC-6703 ring. It is not inexpensive as it is over $100 USD in both locations.

FC-6703 52-tooth ring via Amazon

FC-6703 52-tooth ring via Universal Cycles

The chainring you seek on the UC link is at the bottom of the page.

Both links are based in the US, not Europe.

3
  • 1
    I too have high praises for Universal Cycles. Beware the Stack Exchange rules discourage what appear to be product or business endorsements.
    – Jeff
    Nov 25, 2022 at 22:50
  • 1
    @Jeff - good point. I will remove the endorsement for Universal Cycles from the answer. It’s a challenge to not endorse a resource that has been dependable to me in order to help others, but understand the boundaries, and applying them consistently.
    – Ted Hohl
    Nov 26, 2022 at 18:55
  • 1
    Aside - Shimano has some particular rules about resellers selling their stuff to another market. I used to be able to buy from Wiggle (UK) to NZ and even including shipping it was 1/3 cheaper. Now I can only buy locally.
    – Criggie
    Nov 26, 2022 at 20:04

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.