• Thinking of going hydro on my postmount gravel bike with some GRX ST-810 shifters. Question is what caliper I can get away with using. I'm not so interested in paying 45eur on BR-RS785 calipers when BR-M6100 can be had for 25, and seemingly so can BR-M7100.

    Any good reason to choose the road caliper in this case? It's an older model now using the BH59 hose whilst the GRX and M-series calipers are BH90.

    This bike won't be doing anything but CX/winter rides, not descending the Alps or anything like that so I can't really see a need for anything beyond an XC level brake.

  • No reason at all, just buy the hydro calipers you like.
    You pay 20€ for cooling fins which look nice.
    At least thats my knowledge.

  • My GRX 600 levers are quite good with MT520 4 pot calipers, much stopping.

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