Number of teeth on a bicycle disc
There are many kinds of mountain bikes, there are 3, 42-32-22, 44-32-22, 48-34-24 road vehicles, there are 3, 53-39, 52-38, 48-38, there are also single speed, the general teeth inside the plate is marked how much T
I'll ask for a second, please wait for a moment,
The key is to see the gear ratio than to use the number of teeth in front divided by the number of teeth behind (such as the first 36, 936, in addition to 9=4) ~ the larger the faster the more laborious
