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RPM Heavy Duty Caster Blocks for the ECX Boost, 2WD Circuit, 2WD Ruckus and 2WD Torment are designed to prevent downtime and keep you running. RPM redesigned the overall geometry of the caster block, increasing the thickness of the walls in key breakage areas by as much as 20%. RPM also integrated a strengthening rib down the center-line of the caster block to improve the overall rigidity, helping to reduce or completely eliminate the possibility of a hard hit yanking the king pin screws out of the spindle block. Each RPM caster block is molded from their incredibly tough blend of engineering grade nylons for proven performance and durability
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