Bikes with a wider gear range will typically use a longer cage rear derailleur in order to shift smoothly between high and low gears. In contrast, DH bikes utilise much narrower range cassettes and hence have much shorter caged rear mechs. Choose between a range of front & rear derailleurs, derailleur parts and hangers.
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Once your kid has mastered the balance bike they'll be ready to progress to a normal bike without training wheels, and the next challenge will be teaching them how to pedal. Michael is here to show hi...