Ive seen way to many posts about changing sprockets etc. Decided to do a write up. Changing the front sprocket is much more of a drastic change than the rear. Going down in teeth on the front sprocket lowers top speed but boosts torque. Going up in teeth raises top speed but lowers torque. The rear is exactly the opposite, going up in teeth lowers top speed but gains torque, going down raises speed but lowers torque. As far as diffrences in speed changes between 1 rear sprocket tooth and one front ive found that: 1 front tooth sprocket changes speed by 3-5 mph in either direction 1 rear changes 1-2 mph in either direction As a good rule of thumb ive always followed that one front tooth equals about 3 in the rear sprocket. The warrior comes stock with 13/40 gearing. In my opinion this set-up should not be changed unless you mod or change tires on a stock machine. The stock sprockets are pretty good as far as using the motors power and gear change speed. As far as lowering a time in drag racing goes, I feel that both a 12 and a 14 would raise your 500 foot times. 12 is too low, and 14 puts the motor down too low in rpms between gears. With the 12 you shift more than you move. Also another thing, Gearing changes to accomadate tight trails should not be needed even in the tightest of trails. Lets face it, the warrior stock has the first gear of a tractor, i never had any problems moving it around in woods when mine was stock. Top speed break down Stock the warrior does about 62 mph. Changing to 20" rear tires will put you at about the 58 mph mark, and 18" tires about 54/55 mph. In order to keep the same speeds while changing tire sizes change the front sprocket. Ive found that on the warrior, front sprocket changes change about the same amount of speed as tire changes. For example... if you put 20" rear tires on, changing your front sprocket to a 14 tooth will put you right at about stock speed again. Mods can also affect top speed, for example pipe and cams filters etc. Allow the motor breath more and open up more gaining not only more torque and horsepower but also allowing the motor to rev out further. As far as availible sprockets for the warrior Fronts: 11 12 13 14 15 16 17 ( not sure if it will fit or not, with the removal of the stock case guard any size should fit no problem) Rears: Pretty much anything 38-48 and beyond in either direction. One last thing id like to throw out there is not to waste your money on expensive sprockets. Even the cheapest sprockets will last a long ass time. What wears out sprockets is stretched chains and worn out chains. Keeping the chain tight at all times also prolongs sprocket life. I have found primary drive sprockets to be excellent for the price, ive had the same rear for about 2 years now. Ive been changing fronts to find my sweet spot. Chains are also an often debated topic. There are many diffrent types, oring, non oring, heavy duty, racing chains, x rings. Most guys on here run oring chains. I personally run non oring chains. They are way lighter, flex much easier, and allow you to squeeze a little bit of free horsepower out ( dont believe me?, try it!). My favorite chain would have to be the primary drive 520H racing chain. Its lasted for about 2 years so far. When i first installed it it stretched alot at first, then it got to a point when i could ride its on about 3-5 rides without an adjustment. The trick with non oring chains is frequent lubrication. However since most people prefer o ring chains im going to say id stick to them. All the major companies produce good solid chains, just stay away from the ebay specials and you should be good. Theres no real chain out there that i can say is best. The best way is just to buy a good chain and be done with it, all of the higher priced chains will last a long time as long as they are maintained properly. Chains can be pretty expensive. Ill compile a list of good solid chain brands ive heard good things about and had good experience with. DID Regina RK Primary drive ive heard good and bad. I dont hear much about renthal but im sure its a solid product as most are.