Pending your riding style and rider weight I have found 20/39 to be the best .
If your buying new chain anyway this ratio will have no big deflection in chain.
21/39 will have.
JMO
Pending your riding style and rider weight I have found 20/39 to be the best .
If your buying new chain anyway this ratio will have no big deflection in chain.
21/39 will have.
JMO