sorry, I've been away. It's just the contact to the tire. You turn a knob until you touch the tire, then do two more rotations. They came out with one that is more like a clamp, where once it's setup for your bike, you just open and close the clamp to contact the tire. Everything else is the same except colour. I also have the climbing riser block that will of course be given with the trainer.
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Cycleops Fluid 2 trainers
