A snowmobile has a rear suspension assembly including at least one slide rail, a plurality of idler wheels, a front suspension arm having first upper and lower ends, and a rear suspension arm having second upper and lower ends. The first upper end is connected to a tunnel of the snowmobile. The first lower end is selectively connected to the at least one slide rail. The first lower end is connectable to the at least one slide rail at first and second positions. The first position of the first lower end is vertically higher from a bottom surface of the at least one slide rail than the second position of the first lower end. The second upper end is connected to the tunnel.