Rear Disc Brake Mount

ffpaulgoh

Hello,

I have a carbon hardtail bought somewhere from a china supplier about 2 years back. Recently, I have decided to try building my first mtb and everything went fine until I reach the part where I have to mount the rear disc brake. I'm sure it is a 74mm post mount but it is not threaded. It has another hole perpendicular to where the brake is supposed to be mounted.

Any idea how do I install this?

cooldad

Looks like you need some barrel shaped inserts. They'll be threaded through the barrel.

cooldad

Called barrel nuts or cross dowel nuts.

I think Whyte might use a similar system. I used to have a bike with them but can't remember the make offhand.

cooldad

Remember now, it was an old Turner. Looks like the new ones still use the same system.

http://www.turnerbikes.com/bikes/flux-v4-0/

Page down a bit and you'll see the brake mount. It meant if you stripped anything it was a cheap insert, not the frame.