19 1/4" 156 Link #25 Size Chain For Dirt Bikes, Mini Bikes, Pocket Bikes etc... 19 1/4" Length When Connected / 38 1/2" When Stretched Out. CHAIN PITCH: The most reliable method for determining scooter chain pitch is to examine three consecutive pin heads and measure the distance between the center of the first and the center of the third head. Divide this measurement by two to get the pitch. #25 Chain (1/4" Pitch): The most common size of scooter chains used on electric scooters, and also used on many other electric vehicles.
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