Mountain Bike Air Shock Absorber 120/125/150/165/190mm E-bike Folding Bicycle Scooter Air Absorber Shock Adjustable Air Pressure. Product Name? : Air Shock Absorber (Front/Rear)? Type? : Air pressure adjust? Material? : A7075 aluminum alloy? Model? : BM-RR7? Use For? :MTB Bike / Road Bike /Scooter /Soft tail bicycles/Suspension folding bikes. The factory air pressure of this product is 100PSI. It is recommended that the air pressure of the air chamber does not exceed 180PSI, otherwise it may cause excessive air pressure and cause damage to the cylinder. Inflation valve: American air nozzle. About test , the scooter or bike is stationary, if you use your hand to press, there will be no change, such as: the total stroke of the 125mm shock absorber is 20mm, the actual safe use stroke is about 10mm, it is impossible to press up and down by hand, otherwise it cannot be used to slow down the vibration, the rear shock absorber is in the road surface encounter uneven road surface will play a role in reducing vibration, If your scooter is now in a static state, is unable to play a shock absorption effect pls test it in the road.