Originally Posted by
martianone
Presume a "normal set up" for the 8 spd triple and 10 spd double-
will provide the following ratios:
Misc deletia.................
Triple 25-
2130 622
26.7 30 39 50
12 67 87 111
13 62 80 103
15 53 69 89
17 47 61 79
19 42 55 70
21 38 50 64
23 35 45 58
25 32 42 53
Could you please explain this gearing chart? Most of the numbers make no sense to me.
Example: first line, 2130 622 Huh?
Second line: 26.7 30 39 50. That's 30 on the casette, 39 on the chainring for a result of 50 inches, right? What's the 26.7, then?
Third line and all the rest: 12 67 87 111. I think we are talking about a 12 tooth cluster but which is the number of teeth up front? Do they even make 67 tooth chainrings?
Thanks for the explanation.