Anyone know anything about disc brakes?

That's why they say they're not compatible, depends how much you want them.

I can't figure out where the problem lies but it is sort of putting me off trying it out.

Mate in the shop got them all in for me on the gov 50 quid x2 scheme so he bought the tools as well. You wont believe the b2b hope website its a minefield of codes for every clip nut washer spring seal gasket hose banjo tshirt pump umbrella spoke pawl .

gov 50 quid x2 scheme

I've got no idea what that is!?
Have I missed out on something??

You have indeed missed out but hardly worth the effort.
https://fixyourbikevoucherscheme.est.org.uk/

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Ok

I've ordered RX4 calipers and a Post to IS adaptor.
I have proof that it should work. Sooooo excited

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Hopefully it doesn't foul the IS mount.
I needed a 20mm adapter post to post for my 140 native fork and even the shimano adapter fouled the caliper but nothing that 20 seconds with an angle grinder couldn't solve

The caliper is quite low sitting in relation to the mounting points

Well, it is a longer chat for my own CP thread which I can elaborate on soon. But these brakes will only be on this frame for the remainder of the summer and then go onto a different bike build as I am making this fixed permanently.

The rear caliper is still working so if the rx4 with adaptor doesn't work on this I'll keep the Shimano caliper until I move everything over to the new old frame

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Ah I think I did read something about that scheme.

Haha I haven't seen the hope b2b site for over ten years but it sounds like it hasn't changed...

Nice. We need an Rx4's owners club thread now

signs up

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Cute. I bought purple as well 💜

+1. Managed to get a pair of Shimano PM models in good nick for 40 quid from a club mate. Haven't used them yet mind you. But if it's an owners club not a users club...

Bargain!

I thought so. Virtually ran over there waving the cash along the way.

@snottyotter will BL-M506 work with BR-MT520? 🙏🏽

Or 4 piston brakes have specific levers?

They use the same levers, I've got deore 4 pot to GRX 600 levers working great.

BH59 or 90?

I think the idea is to use the caliper's hose type, but not sure it matters too much in practice.

how do you read my mind?!

90 is a bigger number so much be better, use that.

It's not mind reading, it's stalking and statistics.

I really wanted purple too but I'm too tight to pay Rrp new. Could only find black.
Will get purple bore caps to kinda tie in with the chameleon flip paint on my Tarmac.

That will look very nice indeed!