Kreitler's 2.25in Complete Roller Set delivers approximately 90% more resistance than the 4.5's, which should sufficiently kick your ass. After all, Kreitler designed the 2.25-inch rollers for the US Cycling Team. Not only does this roller set get you in excellent riding shape, but your bike control skills will improve. Choose from alloy rollers or Challenger rollers with poly end caps.
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