RC Ball bearings should always be your first upgrades, it reduces friction for less rolling resistance, and that means higher speed and longer the running times. RC Ball bearings hardly require maintenance and last a lot longer than stock Oilite bushings

Feature:
Material: Steel
Shielding: Rubber

Include:
Bearing (29 Pcs)
-5mm x 11mm x 4mm    x 7pcs
-6mm x 13mm x 5mm    x 2pcs
-10mm x 15mm x 4mm    x 3pcs
-12mm x 18mm x 4mm    x 1pc
-15mm x 24mm x 5mm    x 8pcs
-17mm x 26mm x 5mm    x 4pcs
-20mm x 27mm x 4mm    x 4pcs
Bearing Oil (15ml) #YA-0215 X 1 Pc