Ready to give your Tamiya TT-01 RC car a smoothness and performance upgrade? This is the full ball bearing set you need. Replacing the stock plastic bushings with these proper ball bearings reduces friction dramatically, which means less power loss, higher top speed, and longer run times. This set (part number 2422) includes all the bearings required to fit the TT-01 chassis. Installation is a straightforward swap that makes a world of difference in how the car feels and drives. It's one of the most popular and effective first upgrades for any Tamiya builder or racer. If you're serious about getting the best out of your TT-01, this bearing set is an essential purchase. Get ready for a smoother, faster, and more efficient ride!