Originally Posted by
stratman
Actually, I've just read that again.
It doesn't make sense. What do those numbers mean? You haven't got a rear cassette with 21 sprockets, have you? Presumably the smallest is 11 teeth, and the largest is 37. With 5 others in between.
He is probably referring to the numbers on the shifter indicator. 3 (large chainring), 2 (mid), 1 (small), and 7 (outermost sprocket), ...1 (innermost sprocket). So, 37 if something like 42T front, 11T rear....