Ask a Mechanic: Upgrading Your Mountain Bike Ask a Mechanic: Upgrading Your Mountain Bike Greg O'Keeffe2016-02-03T06:31:41-08:00 Rick wants to know, “ I want to start upgrading my mountain bike, but Ask a Mechanic: Upgrading Your Mountain BikeGreg O'Keeffe2016-02-03T06:31:41-08:00