The Tamiya 42307 upper arm spacers are intended to help adjust suspension geometry on the TRF419X on-road chassis. Supplied in 0.5mm and 0.8mm options, they alter the effective length of the upper arm turnbuckle and influence camber gain while cornering.
Fitting these spacers lets you tailor upper arm length to track demands. Increasing arm length reduces camber gain for a steadier feel, while decreasing length raises camber gain to boost mid corner grip. Try different settings alongside tyre and shock adjustments for best lap stability.
Made specifically for the TRF419X, these spacers offer a more secure fit than standard circular types. They are usable with BA23 components from the TRF419X kit, allowing straightforward setup changes without permanent modifications.
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