The M4WD-40/RE spare roller is a 19mm ringless aluminium ball race roller finished in red. Its aluminium construction keeps the assembly light and the ringless design reduces rotating mass versus ringed rollers. It is intended as a plug-in replacement for applications calling for a 19mm roller.
Compatibility covers common Mini 4WD layouts that accept 19mm rollers. Actual fitment will depend on axle bore, spacer stack and mounting brackets on the chassis; check clearances and axle length before fitting. The roller can be used on chassis families such as MA, MS, AR and FM-A where the interface is appropriate.
For modellers and collectors, colour match and surface finish matter for display pieces. The description emphasises material and form rather than promised time improvements. Installation follows standard 19mm roller procedures and typically requires existing axle and spacer hardware.
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