I am planning to upgrade my drivetrain and I'm in the process of selecting the various components. My bike currently has a Shimano Tiagra CS-4600 10 Speed Cassette 12-28t. I am looking to upgrade to a Shimano 105 5700 10 Speed Road Cassette. The 105 doesn't have a 12-28t so I was wondering based on the following options (below) what would be the closest to what I am riding now?
I am guessing the two in bold would be the closest options. Here's some additional info if it helps:
- I currently have a compact 50/34t 110mm crank. Plan to upgrade from FSA to Shimano 105 5750 Compact 10sp Chainset (same ratios).
- I live in a fairly hilly city (Seattle, WA) and ride mixed terrain hills, flats, gravel (short and long rides). Basically everything but steep mountain passes.
- The existing 12/28t seems to suit me fine.