have not run it yet,
tires are 5" tall hard rubber
not sure on what spur/pinion that will work best
but going to try a 49 spur and a 14p=11.5:1 . maybe go 17pin =9.5:1
also have a 45 spur
I ran 15:1 ratio with 3s on 1/8 wheels 4 3/8" tall street tires and it was awesome