I should know this but does a bigger sprocket on the back give it bottom or top end power...Same question about front sprocket...thnx.

 

A smaller rear sprocket gives you more top end speed and cuts your low end torque back abit. A biger front sprocket dose the same thing. I don't like changing the stock front sprocket size though. I here you have to remove the case saver and that's not a good idea. I changed my 300ex from a 13/38 to a 13/36 to make up for my 20' rear tires!

 

if by case saver you mean that little black metal piece and other guard that are held on by two 8mil bolts then yea.....

removing the front sprocket isnt a big deal dont worry about it. i take it off to clean all the time, right behind there seems to build up a lot of nasty grimey. just make sure you put it on there EXACTLY HOW YOU TOOK IT OFF lol

also to answer the question....

smaller front=better acceleration
smaller rear=better speed
bigger front=better speed
bigger rear=better acceleration

 

im pretty sure both of you guys are reversed on gearing!

a smaller frount sprocket will give = better acceleration
larger frount sprocket = better top speed
smaller rear sprocket= better acceleration
bigger rear sprocket= higher top end speed.

because the general rule is droping 1 tooth in the frount is equal to dropping 3 teeth in the rear, and vise versa......

v581

 

Vinson 581-

Sorry man, but I think you have your back sprocket gearing reversed.

It should be:
Smaller rear sprocket = more top end speed.
Larger rear sprocket = Better acceleration.

 

Vinson581 you are correct about the front but wrong about the back. Bigger rear=better acceleration and smaller rear=more top speed.

 

Vinson is the only one that has it right. Think of it in very simple terms if you decrease the size if the front sprocket it makes it easer to spin lowering the overall ratio and therefore making it easer to accelerate and giving you a lower top speed.

 

No like the others 581 has the rear wrong. Bigger rear = less top end, smaller = more top end. Less top end equals more low end and vice-versa. Or think of it in simple terms...by making the rear sprocket larger, the front sprocket and engine will turn more times than the rear. By making the rear smaller it more closely matches the engine. Closer to 1 to 1 the faster the bike will go but less low end.

Hey 581 stick this on your CAD...

 

Just think of your 18 or 21 speed mountial bike and look at the sprockets and where the chain is in 1st gear and 21st . 1st gear small front large rear 21st large front small rear

 

A good gear ratio chart: http://hondaex.com/techtips/gearing.htm

Larger - front sprocket = more top speed, less acceleration
Smaller - front sprocket = more acceleration, less top speed
Larger - rear sprocket = more acceleration, less top speed
Smaller - rear sprocket = less acceleration, more top speed
Taller - rear tire = more top speed, less acceleration
Shorter - rear tire = more acceleration, less top speed
1" @ the rear tire roughly translates to 2 teeth on the rear sprocket.
2-3 teeth on the rear sprocket roughly translates to 1 tooth on the front sprocket
"Taller" ratios mean more top speed, less acceleration, smaller numerically.
"Shorter" ratios mean less top speed, more acceleration, larger numerically.