what are some good pulley sizes

what are some good pulley sizes if i want my tractor to go about 30

i would say for 30 mph......5"front 4" back. that should be about 20-35mph i believe. because i know 4-4ratio does like 20-25

thanks just so i can get up and down the road to my pappas farm a bit faster

yea. i am building a mudder but it has to go about 65mph.... when i go to miami with it to see my friends there 250 does 45 and there friends 700 prairie does 60 so id wanna keep up with the 700 because i didnt my math and my 21hp is about a 800cc motor

i just dont want it to go too fast cause im not the only one that will be driving it and i dont want to bee going to fast mudding

it will do about 5mph in first gear and in 2nd gear it will do bout 13mph. in 3rd it will do 20, 4th it will do 25 or more. 6th it will do bout 35

how would it pull

hmmm :/ i would think the belt would slip some if you dont tighten it up. just shift the gears like a atv or dirt bike. 1,2,3,4,5,6 that way it graduallly increases

ok thanks

What do you think about 3" front & 2" rear with spicer 4 speed withstock 20"/ 10"/8" rear & 15"/6.50"/ 6 front.B&S 8 HP.

I have a 7inch on the front and 2 1/2 on the transaxle.

Im runing about a 6.5 inch fornt and a 4 inch rear does about 25 mph with a 6 speed peerless.

stock drive pulley, 2 or 3 inch in the back

im running a 41/2" in the front and a 31/2" in the rear and that does 20mph with 20" tires so 51/2 in the front and a 2 in the back should get at least 30 with 18" tires

I say 6 or 5 they are best like i heard on fearlessfront's channel and they do nut run on clearance issues, and they have enough circumference so the belt won't constantly slip.