SpiderTrax Ultimate Unit Bearing5 on 5-1/2" x 5/8" Studs FUBR55125840.
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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. If you have any questions feel free to ask.