Lots of frames use an adapter that is specific for the frame. I suggest you
contact a Trek dealer and ask
A) if an adapter is required - mention the brake model you want to install
B) if they have one in stock - often they bring them in when requested only

Note many brakes also require an adapter for the fork install as well. If
you know your fork and want to add disc there as well, it's worth finding
out about at the time.

Cheers
Gary

wrote in message
ups.com...
Hi,
I bought a used frame and want to instal rear disc on it.
It has 2 mounting holes on the rear triangle.
I guess those are for the caliper.
They are 6mm diameter / ~44 mm apart on opposite sides of the hub.
Does anyone know what adapter / caliper fit in there if at all?
Advice appreciated.
Thanks.
NH.

--
rec.bicycles.off-road is moderated by volunteers. To find help solving
posting problems, or contact the moderators, please see http://rbor.org/
Please read the charter before posting: http://rbor.org/rbor_charter.txt


--
rec.bicycles.off-road is moderated by volunteers. To find help solving
posting problems, or contact the moderators, please see http://rbor.org/
Please read the charter before posting: http://rbor.org/rbor_charter.txt