I currently have an endurance road bike equipped with Shimano 105 hydraulic disc brake calipers. Since I am transforming it into a gravel bike, I would like to change the calipers to the Shimano GRX 810 ones. I don't want to change the brake levers nor hoses though. Would it work? What do I have to consider when doing it?
On https://productinfo.shimano.com/#/com?cid=C-737&acid=C-499 I found this chart:
Here you can spot a GRX caliper BR-RX810 on the right and a 105-brifter ST-R7020 (you didn't state which exact one you own) on the left. So if that is your preferred combination, you should be good to go. I don't know if it will be any better than your existing system of 105 brifter+caliper.
You don't have to change calipers. All Shimano Road/Gravel Calipers, except Dura Ace, are basically identical:
They may differ in design/color and the brakepads that come with them when new.
If you still want to replace them:
- Get new olives and pins.
- Remove the hose from old caliper, cut it just above the old olive to remove olive and the pin.
- Put new olive and pin on the hose and mount it to the new caliper.
- Bleed the brakes.
But there wont be any difference, except the different text and color on the calipers.