The Kyosho MZW412B SP Long King Pin Ball Set is a focused upgrade for Mini-Z MR-03 cars that improves steering accuracy and reduces play in the front end. Replacing the stock balls gives more predictable steering response at speed.
This king pin ball set is crafted for the Kyosho Mini-Z MR-03 series and is compatible with the standard MR-03 steering assembly. It is well suited to drivers wanting steadier mid-corner balance and crisper turn-in.
Fitting the MZW412B is quick and does not require specialised tools. Make sure the steering area is clean, fit the new balls securely, and run a short test to verify alignment and smooth operation.
Copyright © 2008-2025 rcjaz.co.uk All rights reserved