Chain and Sprocket Questions

i know this has probably been covered but i cant find a definitave answer, i am looking to up the gearing and lower the revs at the expence of acceleration, i have a naked pointy, so my questions are as follows:

will a 16t front sprocket fit under the cover?
will 16-42 be too tall? would i be better going for 16-44?
i have heard renthal dont last very long so which makes would be best?
which pitch chain should i use 525? (i dont understand the numbers)


and the most important question:

Where do i buy from? i want a chain and both sprockets.


thanks to all that can offer some help!

ollie

[embee]

I have 16/44 on my curvey (15/44 is std).

16/44 puts the new gearing about halfway between original ratios, new 5th is like "5 1/2th".

It pulls this fine, I reckon if you really want to go this route and appreciate the effects, then 16/42 would be a viable gearing for motorway use without problem. It'll put your 5th gear quite close to the original 6th and the new 6th will be effectively "7th". Don't expect very much effect on economy, potentially there's a little improvement but it's not dramatic, the effect is more relaxed cruising.

For info, chain dimensions are traditionally in inches, the first number is the pitch (distance between pins) in multiples of 1/8", so a 5** series chain is 5 x 1/8" = 5/8" pitch. The second and third numbers are the width between plates (the nominal thickness of the sprocket) also in multiples of 1/8" but with the decimal point missing, so a *20 is 2.0 x 1/8" or 1/4", and a *25 is 2.5 x 1/8" or 5/16".

For road use stick to 525, you'll get better wear than with a 520.

thank you for your help. wher would you suggest a good place to buy is?

am looking to go up on the rear sprock or down in the front.