And as long as we're edumacating on chains...many prefer the SRAM (or non-shimano) chains that have "quick links" or some other type of link that allows you to more easily remove the chain, either for switching out cassettes or thorough cleaning. The Shimano chains require that you have a "chain breaker" tool, to push out the pin to take it apart. then you have to buy a pin to push back in. Some use quick links with shimano chains but to mixed reviews and opinions (what else is new on BF!).