17.5=27
13.5=19
10.5=fast 17
8.5=16-15
7.5=14-12
6.5=11-10
5.5=9-8
4.5=7ish
3.5=6ish
2.5=too fast
this is just about right, but it depends on your manufacter, novak is more torque based so they would be equal to something like EXAMPLE: 10x1 and lrp are more speed so they are more like EXAMPLE: 10x3. Hope this helps, either way, brushless kicks brushed ass in everything except 4wd off road.