• Why is the idea of using Shimano ST-RS685 levers, with RS875 post mount caliper for the fork and RS805 flat mount caliper for the frame a non starter?

    If technically possible, the frame would then be flat mount and I could up grade the fork as and when a flat mount became available.

  • Why is the idea of using Shimano ST-RS685 levers, with RS875 post mount caliper for the fork and RS805 flat mount caliper for the frame a non starter?

    You could do that - there's some hassle involved in sourcing the new caliper and fitting it. Are the pads compatible between the two? Might be worth checking that.

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