Blackburn Trakblock 3 Front Wheel Platform. With the Blackburn Trakblock 3 front wheel platform, you have an incredibly convenient means to level out your bike for indoor trainer workouts. Built from super sturdy plastic, the Trakblock 3 features three separate slots each optimized for a specific wheel size: 700c, 650c, and 26. No longer will you have to resort to stacking books under your front wheel for trainer sessions as the Trakblock 3 removes the guesswork plus supplies a very stable base.
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