my bike is two twwth up in the back and i was wondering how much that would affect my speedo either to faster or slower?

 

it shouldnt effect ur speedo at all. most spedometers get the speed,(and odometer)from the front tire.
ur sprokets shouldnt change a thing

 

I know I have a magazine somewhere that has an equation that shows how changing sprockets affects ur bike. I can't remember if it shows how ur speedo is affected orhow it will change ur top speed. I'll put it up here when I find it but I'm sure u could just google this topic and find an answer pretty quick.

 

That's true of bikes like the F2 and older. Not for your bikes. Your speedo sensor is off the tranny. So changing sprockets will affect your speedo.

Use this to determine your speedo error:

http://cbrworld.net/forums/thread/11033.aspx

 

Here we go

The stock ratio is 43 / 16 (2.687), so this is what the speedo is set for
The new ratio is 45 / 16 (2.813), assuming you haven't changed the front.

So, the speedo is no out by the difference between the ratio, divided by the stock ratio
expressed as a percentage, or

(2.813 - 2.687) / 2.687 * 100 = 4.7%

So, around 5%.

My bike has a 44 / 15 (2.933) setup, so the error is around 10% (9.2)

 

thanks for yalls input. i was just wondering if i am actually going 150 or less[sm=badbadbad.gif]