Can I fit larger rotors on a Surly Karate Monkey fork? I have a Surly Karate Monkey fork that has 160mm rotors.

I'd like to upgrade to Clarks M2 brakes with 180mm rotors.

How can I tell if those calipers/rotors will fit my fork?
You will need an adaptor, but those are common. The only trick is which exact one you need, basically which way you need to move the caliper. The really simple ones just lift it straight away from the mounts like this Hope one:



You might want to move it up instead:



I expect that the 180mm Shimano adaptor is what you want but you should check carefully to make sure the mount spacing is correct.

The process is not tricky, but this blog post explains it in more detail.