Cathrin Brae is good fun and worth a visit if your over that way. Top guys are round the lap in 20 mins but its a compact and fun loop to do a few times. 15 or 20 mins away from strathcyclde park. Aim for the massive single turbine on the hill as that is right at the start of the course.
Regards the zee mech, running it with a standard shimano 32t ring that came off my old triple ring cranks. Using at XCR superstar guide with it.
Sounds like it's time to visit my gran then (lives right next to strathy park for some post bacon rolls!