different sprocket sizes

[85Atc350x]

I just replaced the stock 22 inch tires with 20 inch tires on my 350x and since the tire swap the gearing is alot shorter in each gear and the bike revs out alot faster in each gear. What I'm asking is should i get a sprocket with more teeth or less teeth to bring my bike back to its stock performance level?

Justin
85 Atc 350x

[250sx]

You can either increase the teeth on the front sprocket by one or two or lower the teeth on the rear sprocket.

I'm sure someone has a formula for doing this based on your tire size, but I don't have it.

good luck!

[Fuzzy]

Just to throw my two cent`s in. I have had trouble in the past on dirt bikes becasue of only changing one sprocket. Because it can throw your chain link count off. And you can either have the chain so tight that you cant get it connected or to loose and not be able to get it tight enough. But by changing both sprockets cured the problem. Like one tooth less in the back and one tooth more on the front. Giving you the same gearing as just adding a 2 tooth higher front sprocket. But still retaining full use of your chain adjuster. And it is always a good idea when chainging a sprocket to do them both at the same time anyway`s. I know my wheeler`s seem like they have quite a bit of adjustment for the chain. And it might not be a problem. But if i was going to do it. And going to buy 1 new sprocket anyway`s . I would spend the money on the rear sprocket also and set it up this way. Just to make sure with chain stretch and all. That you will still be able to tighten it out on the trail if you need to.

[ATCRYDER]

hmmm, Im changing from my heavy @$$ 22inch Surtracks to a 20 inch turf tamer or something close. I didnt really think about the effects. Thanks for posting guys (0:

[85Atc350x]

Well, I changed the front sprocket about 1 1/2 years ago and it probly only has about 30-50 hours on it so i just want to change the rear one to get the bike back into the stock performance range. If anyone knows how many teeth smaller i should go than stock let me know.




Justin
85 Atc 350x

[ATCnut]

I did the same thing on my 350x, and I found that replacing the stock 13 tooth front sprocket with a 14 tooth sprocket fixed it right up. A 14 is the biggest you can put on the front with the case saver in, some people will run a 15 without the saver, but I would not. Punching a whole in your case is not worth it. I had no problem adjusting the chain on my 85 350x with the 14 up front.

[markb]

try 20/22=.909
.909*your stock ratio= the equivalent ratio you now need
i don't know the stock 350 ratio so i'll use a hypothetical 13 front and 40 rear
40/13=3.077
.909*3.077=2.797 which is your new target ratio
you've posted that stock front is 13 so 13*2.797=36.36
you'd need a 36 tooth rear to equal it out
or 40/2.797=14.30 tooth front, which would be cheaper and you shouldn't have to cut the chain
mark

[Fuzzy]

You bet they can. You can have all the power in the world. But with out proper gearing you cant take advantage of it. We use to be able to get 100 and 125cc dirt bikes up to darn near 100mph just by playing around with the gearing. This use to be popular for cafe style racing in the 125cc or lower class. So it is very surprising how much 1 tooth can make such a big difference.

[Dirt Digger]

Thats right, 14 tooth for the front. markb gets 2 thumbs up for this one. Now for the cheap way to get the .3 of the 14.3 sprocket. Lets say you run 5 psi tire pressure: 14*.3=4.2 divided by.909=4.62*1.3= 6 psi :headbang: