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I have a GRX810 2x groupset and thinking about changing the shifting system to eTap but stick to the braking system and the crankset. I tried to get any information for the GRX group but could not maybe since it is quite new.

Could anyone help me out here?

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It's unclear what you mean by 'changing the shifting system to eTap but stick to the braking system'. You can't separate the two systems.

If you change shifters you are changing the brake levers. Shimano and SRAM hydraulic brake levers and calipers are utterly incompatible as they use different hydraulic fluids (SRAM DOT fluid, Shimano mineral oil).

If you are replacing the shifters/brake levers why not replace the calipers too?

Shimano provides extensive info on all their bicycle products. Start here https://productinfo.shimano.com/#/. Specific GRX810 info is here https://productinfo.shimano.com/#/lc/rx810/mech_2x11.

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  • Thank you for your answer. I have the whole GRX810 Set and want to change to eTap. I thought I could safe some money by not replacing the crankset and the calipers. That was the intention of my question. – ruedi Jul 12 '20 at 11:23
  • @ruedi you might be able to use the crank, but everything will be guaranteed to work better if you swap the whole group. If you want electronic shifting there is a 810 DI2 group which would all you to keep calipers, crank chain, cassette etc. – Argenti Apparatus Jul 12 '20 at 11:31
  • That is right. But I do not want anything conserning shifting inside my frame and with the Di2 this is not possible as far as I see. The eTab is completely outside that is what I am looking for. Thank you for your hint though! – ruedi Jul 12 '20 at 11:33
  • @ruedi I’d like to emphasize Argenti’s statement on incompatibility. Everything in a brake, including the rubber seals, is designed for a specific type of fluid. SRAM uses something called DOT 5, which is corrosive. Shimano uses a type of mineral oil. You put DOT 5 in something not designed for it, and it would surely corrode the seals. If you tried it, you would destroy the calipers and not even have those to resell. Also, properly installed Di2 won’t rattle in a gravel bike (personal experience). – Weiwen Ng Jul 12 '20 at 12:41
  • @Weiwen: Thanks for highlightening the point. A am aware of this. It is not abouit ratteling. I just do not want to remove the bottom bracket and other thinks if anything crashes. In my case atm I even have to remove the bottom bracket to renew the shifting cables... – ruedi Jul 12 '20 at 12:53

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