CYCLEOPS 9900 WINDSimply shift gears to change resistance 2` resistance unit roller allows for 650b, 700c, 26`, 27` and 29` wheel sizes up to a 2. 0 tire Designed to fit common road and mountain bike frames with included steel quick release skewer and has three settings for rear dropout spacing: 120mm, 130mm and 135mm Vortex blade design generates progressive resistance Die cast Zinc fan blades double as a heavy flywheel for fluid starts and stops Spring loaded skewer
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