regearing for smaller tires

[07RedRider400]

my 07 400ex has a 14 tooth front sprocket and 38 tooth rear (i think) and the stock 20" tires. Ive been thinking about dropping down to 19s, any one know how i should change the sprocket setup to keep the same(or better) acceleration and same top speed?

[Drfat400ex]

Why bother? All that's going to do is give you lower ground clearance doing that I would think, and if you want it lower go right to 18s. But go down a few on the rear and probably leave the front for that.

[chevymanrick]

If your dropping a size tire in the back you'll be increasing your acceleration, if you want to keep the same gear setup for speed you'll new to go down one or 2 teeth in the back sprocket

[CJM]

Up a tooth front is more speed, down a tooth front is torque. Up a tooth back is torque and down a tooth is speed

For 1 size up in the front its like going up/down 3 inthe back.

Play with the rear first.

for what its worth: your wasting your time with 19" tires.

[TheAwesomehonda]

I was going to ask the same question about 18in tires but i said screw it and got 20in cuz all u gain with 18in is some stibility.

[Drfat400ex]

Originally posted by TheAwesomehonda
I was going to ask the same question about 18in tires but i said screw it and got 20in cuz all u gain with 18in is some stibility. And torque, accelleration, loose a bit of speed.

[CJM]

18s are worthless unless you ride the track only. Otherwise they are to small for anywhere else.

[TheAwesomehonda]

Originally posted by Drfat400ex
And torque, accelleration, loose a bit of speed. No i'm saying if you got the gearing changed so its the same as stock.

[407EXr]

I agree that the smaller tires like 19s or 18s would be no good for anything but track....... I personally run 22s and with a 12/38 it has amazing torque. I tried the stock (15/38) and it bogs bad in 1st. I would say a 15/40 or 42? Like others were saying, play with the rear sprocket.

[TheAwesomehonda]

Originally posted by 407EXr
I agree that the smaller tires like 19s or 18s would be no good for anything but track....... I personally run 22s and with a 12/38 it has amazing torque. I tried the stock (15/38) and it bogs bad in 1st. I would say a 15/40 or 42? Like others were saying, play with the rear sprocket. 14 and 39 is stock for 05+ and 13 and 38 is stock for 99-04 man.

[CJM]

Originally posted by TheAwesomehonda
14 and 39 is stock for 05+ and 15 and 38 is stock for 99-04 man.

Fixed.

[TheAwesomehonda]

Originally posted by CJM
Fixed. What does that mean :huh :huh :huh

[Drfat400ex]

Originally posted by TheAwesomehonda
No i'm saying if you got the gearing changed so its the same as stock. Oh then yeah, but if your riding trails it sure as hell isn't worth it because of the ground clearance.

[TheAwesomehonda]

Originally posted by Drfat400ex
Oh then yeah, but if your riding trails it sure as hell isn't worth it because of the ground clearance. Exactly my point!!

[b0rn c0nfused]

Originally posted by TheAwesomehonda
What does that mean :huh :huh :huh
You said 13 to 38 gearing for 99-04 he changed it to 15-38 which is the correct gearing.

[TheAwesomehonda]

Originally posted by b0rn c0nfused
You said 13 to 38 gearing for 99-04 he changed it to 15-38 which is the correct gearing. IDK i was just saying that 13 38 was stock gearing for the 99-04.

[Drfat400ex]

Originally posted by TheAwesomehonda
IDK i was just saying that 13 38 was stock gearing for the 99-04. But... 13/38 isn't right. It is in fact 15/38. :blah:

[storms400ex]

i run a 14/38 with 18's but mines a 05

[TheAwesomehonda]

Originally posted by Drfat400ex
But... 13/38 isn't right. It is in fact 15/38. :blah: I'm so embrassed... Sorry man your right I was thinking 13 cuz thats what my 01 has but that isn't stock i forgot..