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Does anyone know what type of mount this is? Its like an IS mount but in a strange position!Im trying to put a 180mm rotor on it. So, are there any adapters I can use for a modern XT brake or does anyone have a cheap brake I could put on it?!?
Im building up a frankenbike and had an old pair of Spinner (I think!) Cargo forks, 180mm from maybe 2012 or around then, never used.

Looks like an old Boxxer mount
Is it not just an IS for a 203mm (or similar) rotor?
I did try replying to this earlier. Google Marzochhi disc mounts and see if any of the online discussion has measurements that are similar. I remember some bombers from the late 90's and early 2000's has an odd disc mount that was like IS but not.
I think the top lug normally sticks out higher on the marzochhi though. Might just be a rotation though as you get with PM and IS mounts on different frames and forks.
Forum keeps rejecting my replies... I dont know what's going on here, but I'll try to post without linking to anything.
There is a video on youtube (titled "Falando Sobre a Spinner Cargo 178") of a similar fork, which mentions "Boxxer" at the 2:38 minute mark. There is also an older STW topic titled "Officialy confused – Boxxer brake adaptor".
l.e. Looks like the links were the cause... the "new" forum software is pants.
Might help if we knew what fork it was? But probably either what Hatter or Njee20 said, either a 203mm IS mount or a Boxxer mount. Although I thought the Boxxer mount was closer to the Marzocchi mounts (i.e. it looks like a normal IS mount position, but isn't)
Marzocchi 20mm mounts were just spaced differently IIRC, they took the dimensions for a 100mm spaced fork, and spread the legs by 5mm each side to make the 20x110mm forks, so they needed a 5mm thick spacer.
Whatever the mount is in that video at 2:38, thats it alright. Trying to find it here now!