Q: What is a knurled barrel and why does the UP-03 have one?
The knurled barrel is a textured band machined into the rim where the tire seats. It helps stop the tire from slipping on the wheel under the instant torque and repeated hard braking of a heavy EV. On a Model X making big power, that grip keeps the tire and wheel indexed together, which protects balance and guards against gradual pressure loss.
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INSTALLATION guide
For the do it yourselfer or trained mechanic, our in-depth installation guides provide step by step detailed instructions on fitting your Tesla with Unplugged Performance Parts.
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