These 8.4mm pivot balls by Arrowmax are intended for XRAY NT1 and RX8 chassis, offered in titanium to resist wear while keeping the unsprung weight down. The components are hand-ground to ensure consistent dimensions and smooth pivot action at the suspension link points.
Sold as a two-piece set, the AM-RX8-337250-TI option serves as a direct replacement where 8.4mm titanium parts are preferred. Arrowmax also lists this size in spring steel and hard-coated 7075 aluminium so builders can tune durability versus weight for their car.
Use the titanium set where 8.4mm titanium components are called for to keep suspension geometry precise and to reduce joint wear during frequent running.
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