The green wheel CROSS 12SG-MG RLS is a complete, pre-assembled and ready to insert 8 inch spare wheel with reverse lock system that fits Skikes and other cross skates on 8 inch base. The reverse locked ABEC7 wheel bearings are rubber sealed on both sides, lubricated and water protected. The backstop makes it easier to conquer slopes and saves a lot of energy when touring. The widely recommended Major Grip tire guarantees a high mileage, rare failures and comes with a full off-road tread. The wheel is specifically designed for all terrain use, uphill and downhill. 4-5 bars of air-pressure present a fair balance between suspension and grip.