It is easy to installation
Innovative design universal style
Diameter of Axle Hole: 12.9mm
1. Instruction is not included,professional installation is highly recommended.
2. Please check the size measurement chart carefully before making payment.
3. Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm).
1 X Set Of 13mm Chain Adjuster Tensioner