Disc brake caliper compatibility

Equipment
1

Quick question about caliper compatibility. I’m building up a gravel bike that has post mount brakes. I want to use Ultegra di2 (8070) which it looks like there is only a flat mount brake offered. I looked into this briefly and it looks like I cannot use an adapter to go from flat mount to post mount. Does anyone know what other post mount hydraulic brakes might work with this setup?

Thanks,

Brandon

2

Yes, it’s no problem to achieve what you want. You can use a Shimano road post-mount caliper in place of the flat-mount caliper. For instance, you can mount an Ultegra 6870 series BR-RS785 or BR-R785 post-mount disc caliper onto the brake hose of any of these flat-mount brakes: a Dura-Ace R9100 series brake, in place of the flat-mount BR-R9170 caliper, an Ultegra R8000 or 6800 series brake, in place of the flat-mount BR-R8070 or BR-RS805 caliper, or a 105 R7000 or 5800 series brake, in place of the flat-mount BR-R7070or BR-RS505 caliper.

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3

Thanks for the comprehensive response. Appreciate it.

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4

Well, I take no credit other than Google-fu (I’m decent at search sometimes). Zinn is the real monster of knowledge there.

5

Thanks. I looked for a bit but I read a few things as if they would not be compatible with that di2 lever which seems ridiculous but I was nervous about buying something that wouldn’t fit.

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