WTB Proterra Tough i30 Rear Wheel - 27.5" 12 x 148mm 6-Bolt BLK HG 11 MTN 32HWTB Proterra Tough i30 Rear Wheel 27. 5" 12 x 148mm 6 Bolt Black HG 11 MTN 32H. Proterra Tough i30 wheels keep the trail in check while everything else blurs by in the periphery. Reinforced by WTBs proven Dual I Beam support Proterra Tough rims feature a 30mm internal width to provide higher tire volume while also increasing sidewall support at lower pressures. Choose Proterra Tough when you need a wheel that wont let you down. Frequency Hub with top
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