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hose with a banjo connector
Yeah good shout, I realised this earlier. All the MTB calipers use a banjo connection. From memory my old 785 calipers didn't have a banjo connection. So to avoid buying new hoses too, I'd ideally get a second hand pair of 785 calipers.
This is just for a winter hack bike, in an ideal world I'd find someone selling the older RS685-RS785 shifter/caliper combo. But it could take a while waiting for some to show up.
TotalShanner
Best check the Shimano compatibility chart but IIRC you can use the latest road shifters with the latest MTB postmount calipers and they all use a BH90 hose. The older road 785 postmount calipers use BH59 hoses yet people seem to have been mixing them with newer shifters without any issue.
If you buy a full shifter set (with hoses and flatmount caliper) and intend to use a MTB caliper then not only will you need to sell the calipers but there's a good chance the hoses won't be compatible too - you'll likely need a hose with a banjo connector on if you buy MTB calipers.
You may find it cheaper to buy the parts individually but few shops online are selling each bit individually.
I recently went through it all. I bought GRX shifters, SLX calipers, and the correct hoses and connectors all from German shops (bikediscount, bike24).