![Wink :wink:](./images/smilies/icon_wink.gif)
Die Zahlen 14 bis 19 bitte gedanklich über die darunter stehenden Zahlenreihen stellen.
It's interesting to note that the gear ratios can be changed by either the front sprocket or the rear sprocket. It's also possible to go ether way and end up with something better or worse than the original settings. For example, this chart illustrates the various gear ratios that might be obtained by using different combinations of front (top row) and rear (left column) sprocket teeth:
Gear Ratios - Motorcycle Front/Rear Sprocket Combinations
14 15 16 17 18 19
49 3.50 3.27 3.06 2.88 2.72 2.58
48 3.43 3.20 3.00 2.82 2.67 2.53
47 3.36 3.13 2.94 2.76 2.61 2.47
46 3.29 3.07 2.88 2.71 2.56 2.42
45 3.21 3.00 2.81 2.65 2.50 2.37
44 3.14 2.93 2.75 2.59 2.44 2.32
43 3.07 2.87 2.69 2.53 2.39 2.26
42 3.00 2.80 2.63 2.47 2.33 2.21
41 2.93 2.73 2.56 2.41 2.28 2.16
40 2.86 2.67 2.50 2.35 2.22 2.11
This matrix uses a simple calculation: rear sprocket teeth/front sprocket teeth = gear ratio. Our Triumph Thunderbird Sport sample motorcycle came with a 17-tooth front sprocket and a 43-tooth rear, for a 2.53:1 ratio (43/17 = 2.53), shown in red in the matrix above. This means that the front sprocket turns 2.53 times to turn the rear wheel once. Changing the ratio so that the front sprocket makes more turns for each single turn of the rear wheel can mean that the bike will be revving higher for any given speed, which was my goal.