Do you know how to maintain mountain bikes? Let me introduce you in detail...
     1. Remove the attachment on the handlebar. Including lights, bells, etc., if it is a V brake, release the brake cable. Starting from the front brake, push the two brake calipers to the rim so that the brake cable is not stressed, and then take the cable out of the card slot, and the rear brake is also operated in the same way.
     2. Turn the bicycle over. To protect your grip and seat, spread an old blanket or similar on the ground. Standing next to the bicycle, leaning over the bicycle and grabbing the frame, holding the fork down tube in one hand and the seat upright tube in the other hand, lift the bicycle and turn it over.
     3. Remove the wheels. Open the quick release lever on the front axle and take out the wheel. Open the rear wheel quick release. When lifting the wheel, loosen the gear from the transmission mechanism.
     4. Clean the drive system. Use a brush and some soapy water to clean the rear derailleur and brush all moving parts.
     The above is the information of the frame folder series and the single-section series folding riser.