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Discussion Starter · #1 ·
I just changed my rear sprocket with a renthal 41 tooth,much lighter and drop RPM 250. Now at 60MPH RPM'S is 4,000
 

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Funny you started a thread about rear sprockets. I've been chasing one all day. I have a '07 with +3 rear (43) now and wanted to replace it with the same. But, in black, Superlite sprocket from Drive Systems. I bought it online the other night and just got an email this morning, no more 43's until September 1st. They are the manufacture so nobody has them or will be able to get one until then. However, they do have a +1 (Boo) or I could just cancel and buy a Vortex 43 in black for $10 more.
You've had 2 '07's so what are you thinking zephyrboy? Point me in the right direction.
I was thinking buying the 41 for long trips and the 43 later if I really hate the 41.
 

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I just changed my rear sprocket with a renthal 41 tooth,much lighter and drop RPM 250. Now at 60MPH RPM'S is 4,000
Thats what it is on my '03 stock. :dontknow:
 

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Discussion Starter · #4 ·
I pulled the spec for both bikes 07-10. the 07 Final reduction ratio 2.667 (40/15 The 10 Final ratio is 2.800 ( 42/15 ) The 07 @ 60MPH was 4,000 RPM, But the 10 is @ 4,300 RPM'S and I keep looking for 7th gear on the Hwy. I ride allot of Hwy & back roads deals gap. So if I need more power I just shift down one. Underdog me personalty I think a 43 is a bit much, for me at 60MPH you have to be at 5,000 RPM'S. I had the 15/41 on my 07 and loved it :thumbsup:
 

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Thanks bro, I'm going to order the 41 tooth since I'm headed up north to the GP race in a couple weeks. Maybe I'll pick up a couple mpg's for the road trips.
The 43 was 67.7 at 5,000 and 81.2 at 6,000 and 94.7 at 7,000. it's +7.5%
The 41 will be 71 at 5k, 85.2 at 6k, and 99.4 at 7k. it's +2.51% over stock. According to the gearing commander website anyway.
 

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I've read alot here about the 520 chain not being good for the z. Some one explain to me how dropping a few pounds worth of rotating mass is bad?
 

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Discussion Starter · #7 ·
I've read alot here about the 520 chain not being good for the z. Some one explain to me how dropping a few pounds worth of rotating mass is bad?
As long as its strong enough there is no problum
 

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Its all about tensile strength....
 

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I can and have stretched a 525 pitch chain with just a few hard starts and playing with wheelies. The 520 is a little lighter/smaller and could have less tensile strength. Lots of people run them on the Z and I haven't heard any complain yet. It probably depends on how you ride and how hard you're hammering the throttle. I figure if Kawi could have saved some money and put on a lighter or cheaper chain they would have. My son has a RC51 and his is a 535 pitch chain. What are they running on the other big horsepower bikes?
I just put a D.I.D. Super Street 525ZVM-X on my bike today. It is rated MAX. 1300 C.C. and cost $132.00 which I didn't think was a bad price at all for a quality chain.
Link: D.I.D Racing Chains and Dirt Star? Rims
 

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More than enough tensile strength underdog..... I got the EK 525SRX and its only rated for a 750 cc, but the tensile strength is around 9,000lbs i think.....forgotten since I looked it up when I bought it
 

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i have a 2011 z1000 and i changed my sprockets .....up one in the front and down three in the rear. made a big difference, each gear is way more usable, pulls longer, and almost as hard, still pulls the wheel up whenever i want it to and lowers the rpm's by 1000 on the highway and i get better gas mileage. its a total win win in my book since this bike has all the torque anyone could ever need on the street.
 

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