---S-----L----XL
6 5325 3868 2501
7 4567 3168 2145
8 3998 2765 1875
9 3548 2212 1667
10 3198 2212 1502
11 2903 2010 1365
12 2686 1843 1251
The lower the number of turns, the faster the motors will spin per volt of power they are fed, but the more amps they will draw & hotter they will run. This rpm/volt figure is called the KV rating, and around here we generally like to run motors in the 2000kv region, for cooler running and longer run times. XL sided motors are the longest and produce the most torque which is required by larger & heavier vehicles.
As I already said in your other thread, you will be best off with either the 8 or 9xl on 12 cells/4s lipo/ 5s A123 & runing the MM esc. You will also need to use a ubec device with this setup, such as the CC unit that mike sells
HERE.
Gearing info
HERE
Wiring info
HERE