Sprocket size

[290welder]

Getting kx250f race ready for district 11 what size sprocket to run front and back b class

 

[mthalt10]

i always liked 13f/48rear..it has good bottom end and still has the top-end speed that you need.. i run the 13/48 on all of my 250fs i have had..i have tried to experiment with different sizes but anything larger then a 50 will take away all of your bottom-end and that is something that you really need