The FREE RANGER is designed from the ground up to upgrade your 10 speed transmission to a great 11-40 tooth range
It is compatible with most 10 speed medium/long cage rear mechs on the market and any 10 speed chain will do. You can keep 10 speed sgifters too!
No need to change the freehub body either, it fits on the standard one.
The FREE RANGER can either be used 1 x 10 to give you that extra gearing to arrive at the top ready to slay the trail ahead or it can be used with a 2 x 10 setup to get up those simply ridiculously technical bits of trail. It is especially beneficial on a 29er where classic 2 x 10 gearing con sometimes put too much strain on the rider.