I agree with Hillrider's questioning the usefulness of an 11 T cog for most of us, especially with a 53 T chain ring. My bike has Shimano 50 x 13 which will take me to way faster than I can sustain for any reasonable length of time. If I could find an end 14 T, I would exchange it for the 13 T because I would rather have close ratios in the middle of the range, where the most time is spent.