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https://www.planetx.co.uk/i/q/BSSDBM/sram-disc-brake-mount-adaptor
Can I use any of these to run a 180 disc on a post mount Rock Shox fork and a 160 disc on a rear post mount frame?
Shimano brakes.
I have no idea what the letters mean in the description.
Are yr brakes post-mount too ? That adaptor link suggests they are
What fork ? (some RS forks, like Lyriks, are 180mm without any adaptor)
Brakes are post mount and forks are rebas.
^ same for frames, what is the rear unadapted mount on your frame?
REBAs, I bet you do need +20mm
CPS are the swivelly washers that some brakes are designed for
OIS - presumably those are IS tabs (like older brakes with the bolt perpendicular to the "line" of the wheel/rotor
Post mount frame and brake.
For the forks it should be the post to post 20mm and the frame may be the same but it depends on the frame which could be 140, 160 or 180 or something else. I realise they are cheap but don’t forget the postage and variable lucky dip nature of buying from Planet X plus you may next be asking what bolts you need because the adaptors didn’t come with any
From the web page...
"Bolts and washers for illustration only, not supplied with adaptor mount."
So yeah I'd just buy some from CRC or wherever, that actually come with bolts.
Where do you live?
Feel free to rummage in my box.
I've got bolts galore, so that's not a problem.
Have measured the back and the calliper needs moving 10mm from the frame. Anyone point me in the direction of what I need?
Are back and front adaptors different these days with post mount?
calliper needs moving 10mm from the frame
You’ll want the post to post 20mm again. 20mm more diameter = 10mm more radius
I may have a couple also. I'll have a look tomorrow morning. I'll just post you them if I do. I'll DM you either way, by about 12:30 at the latest.
Sorry! Had a busier morning than expected. I'll have a gander when I pop my bike in the cellar when I get home from work.