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)