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2.71" dia up wheel for 3/16" front or rear axle. (NOTE SETOP WHEELS SOLD AND PRICED AS EACH. 2 REQUIRED) The reinforced front and rear arms allow for simple toe in/out check with a mini tape measure with added accuracy over the 1.6 version. The arms are low enough to allow the tape to run under any car running more than 1/8" ride height. Video coming soon. Designed for use with Custom Works dirt oval cars or equivelant. has slot for drive pin for rear axle use