snippet: Built ground up for Ultra4 rock racers, the Spidertrax Ultimate Unit Bearing is truly the reinvention of the unit bearing itself. Genuine Timken bearings, full chromoly heat treated construction, and a fully integrated drive slug makes the Ultimate Unit Bearing the only racing unit bearing of its kind. The Ultimate Unit Bearing, the last bearing you'll ever need.<br><br>This Ultimate Unit Bearing uses 5/8"-18 studs on a 5 on 5.5" bolt circle, designed specifically for Spidertrax 40 splined axle shafts.<br>

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