1:1 and 2:1 Rapid Fire Shifters

[Mama Coosa]

I am learning some neat stuff about rapid fire shifters. One of the big differences between SRAM and Shimano is the ratio. The Shimanos are a 2:1 ratio, which means more cable. Which can mean that it can be a bit more finicky with dirt, cable stretch, etc. The SRAM 1:1 require less cable and thus are not as high maintenance.

This is only true for model year 2009 and before. In 2010, Shimano came out with their 10sp Dyna Sys drivetrains. Among the many changes to the new groups, was a change in actuation ratio. Now the actuation ratio on Shimano shifters is very close to the ratio on Sram shifters.