bmwrd0
Well-known member
Older French bicycles use 9mm on the derailleur.
But if you are solely going by DIN or JIS standards for your tooling needs, you are going to get caught shorthanded. Engineers use whatever sizes they think will work and do not really care about standards that hold them back.
But if you are solely going by DIN or JIS standards for your tooling needs, you are going to get caught shorthanded. Engineers use whatever sizes they think will work and do not really care about standards that hold them back.

