Originally Posted by
BluesDawg
I'm running a 12-30 Tiagra 10 speed cassette on my Roubaix now. Although the Ultegra RD is only rated for up to 28 teeth, it works flawlessly with no adjustments needed. The extra two teeth give just that little extra I had been wishing for on my steepest climbs and I don't miss the 11 at all.
I am running a triple with a low of 30 and a 13-30 cassette (9 speed). I have knee issues and this gearing allows me to keep a nice cadence on all but the really steep stuff. I spin out at about 32 mph on the descents but it's not a concern.