doing rear sprocket, need some input

[jamesmccain]

whats stock rear? 36?

[galaxy]

Originally Posted by jamesmccain

So in that case, whats the pros of swapping to a 520 race chain then? I looking at the ERV3 actually... with a 520.

also note, around 9500 mileage... I take it front should be done too?

The chain you are looking at (520ERV3) is lighter and stronger than the stock (or most other) 525 pitch chains. At least you are looking at the right chain. No way I would want to put a weaker chain on a 999!!! The only benefit to the 520 chain is reduced weight/rotating mass. This is ideally for the racer who is trying to drop every ounce he can when on a race bike that it actually makes a difference. I find it hard to believe that you or I on a 70/30 % street/track bike, would ever know the difference in that 8 ounces of weight savings... But that's just me. For me, it's not that I don't think it's worth it, it just more so that I don't think it's worth the cost $$$. The cost of the initial upgrade, plus the cost of sooner chain replacements in the future. Got too many other CF goodies I'd rather invest in than spend that money on a 520 conversion.

As for the front sproket change now, that's mixed also. Some flat out say yes, some say depends on what the sproket looks like. My SS has 15,000 miles on it and the sprokets look great right now. No fish-hooking or anything. I'll make that decision to replace both when the chain 'needs' replacing next time.

[mad]

Originally Posted by jamesmccain

whats stock rear? 36?

IIRC 15/36 from da factory.

[molasses]

Personally, I've never understood the urge to swap a 525 chain for a 520.

If weight savings is your goal then you're far better off either losing a bit of weight yourself (the cheapest mod there is) or going for lighter parts elsewhere on the bike.

A broken engine case from a chain failure at speed isn't something you'd wish for and the slight weight savings going from 525 to 520 certainly don't justify such a risk.

That's just my thoughts on the subject.

You do whatever you feel like but keep in mind a 999(S/R) produces quite a bit of torque and at some stage it might exceed the tensile strength of a 520 chain.

[dzucati999r]

I went to the 40 tooth on the 999r and think it's the best mod yet. It was crazy fast before. Now I'm afraid of it and it's been in the garage ever since. Ya Sure!

[critterdoc]

Originally Posted by molasses

If weight savings is your goal then you're far better off either losing a bit of weight yourself (the cheapest mod there is) or going for lighter parts elsewhere on the bike.

+1

Never fails to amaze me how much people will spend to reduce the weight of the bike by 10# when they're at least 30# overweight...and most of that weight sits ABOVE the saddle making it even worse.

How about a regimen of regular exercise and a responsible diet?

Doesn't cost a penny and may even help you live longer too!