I’m building up a Bird Zero, when I’ve mounted the Zee brake Calliper it’s only just touching the very edge of the disc. The disc is a 203 and so is the PM to PM adaptor. Forks are 2018 Rockshox Relevation.

I’d post a pic if I could work out how!

front brake mounted on rear adaptor ?

The fork will be a 180PM not a 160PM so you’ll need a different adaptor.

160 to 203 adaptor in a fork with 180 mm minimum rotor size?

EDIT: 41 seconds…

So I’ll need to get a 180 PM adaptor?

You need a 180-203 post mount adapter. Or you can run a 180 disc with the caliper mounted directly to the fork.

You should be using a 160 to 203 adapter pm-pm. Is that definitely what you have?

Edit: seems to be differing info about what size mount the fork comes with. Sounds like you need a 180-203 pm-pm as above

Hope adapter H for 160mm to 183mm on a 180mm mount gives you 203mm rotor spacing.

2018 revelations are 100% a 180 post mount, so as all the other replies, a 180->203 adapter is needed, not a 160->203.

or…just leave it as it is and mop up all the downhill segments in your area on Strava?