CHAIN STAY LENGTH/GEAR RATIO

Here's the Gear ratio and Chain stay length of 14 popular gearing combinations, note that chain stretch
and other variables can change the chainstay length slightly
. No half link!

The most common gear ratios are in bold text.

SPROCKET

DRIVER

GEAR RATIO

CHAIN STAY

LENGTH

 

25

9

2,78

13.19''

13.69''

14.19''

25

10

2,50

13.07''

13.57''

14.07''

           
27 9 3,00

13.17''

13.67''

14.17''

27 10 2,70

13.05''

13.55''

14.05''

 

 

 

 

 

28

9

3,11

13.29''

13.79''

14.29''

28

10

2,80

13.17''

13.67''

14.17''

28

11

2,55

13.05''

13.55''

14.05''

           

30

9

3,33

13.27''

13.77''

14.27''

30

10

3,00

13.41''

13.91''

14.41''

30

11

2,73

13.29''

13.79''

14.29''

30

12

2,50

13.17''

13.67''

14.17''

 

 

 

 

 

33

11

3,00

13.39'

13.89''

14.39''

33

12

2,75

13.27''

13.77''

14.27''

33

13

2,54

13.15''

13.65''

14.15''

 

 

 

 

 

36

12

3,00

13.36''

13.86''

13.36''

36

13

2,77

13.25''

13.75''

14.25''

36

14

2,57

13.13''

13.63''

14.13''