Originally Posted by
ziqpy
I'm using a tape measure but getting aroudn 132mm on rear.
The forks have a pressed section to clear discs, and around 95mm from center.
I going with 53/39 because of the smaller wheels.
Last bike i was a specialized rockhopper.
2000 ish model
something like this ish...
Used to go everywhere around 16mph and deff without tail wind got 30mph outta the bugger on the flat. Fastest was 47 going downhill filtering (which you should not do at that speed)
Sounds like a pretty standard d/o, so I would be so bold as to say it is built to common standards. I.e. as long as you get the right sized adapters between the calipers and frame/fork, everything will work out fine. Hubs built for disks are built to work for the same standards, so go nuts. As I said, mtn hubs at 135 will be more common than road disk hubs at 130.
I'd still be tempted to go with a 50/34 crank, but if you rarely find yourself in the three lowest gears on your mtn bike, then it's a wash, stick with the bigger crank. With the Rival groupset, you could always swap out to a mtn RD (X9) and 11-36 cass if you find you miss the lower gears.