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Discussion Starter #1
I have a 2008 zx6r, I'm about to get new sprockets and chain. Thinkn about doing -1 in front +2 in back. Anyone know how much top end I will lose? Bike does 170 now, don't want any less than 160. Thanx...
 

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The shorter gearing will make you think you're going even faster....
 

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My 2011 with -1/+2 runs completely out of gear at 135mph
 
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I have a 2008 zx6r, I'm about to get new sprockets and chain. Thinkn about doing -1 in front +2 in back. Anyone know how much top end I will lose? Bike does 170 now, don't want any less than 160. Thanx...
:ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO:o_Oo_Oo_Oo_Oo_O:ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO:

do some math, why should anyone else do it for you!?!

and you surely confuse speedo indicated speed with actual speed!

your 08 will not do anything close to 170, even if you threw it out of a plane... despite some claims of 164 or even 170, they only did an honest 159 in stock trim and 2 miles of flat windless roadway! even modified ones with +/- an additional 10hp still barely topped 160
 

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Discussion Starter #6 (Edited)
Just asking a question bud, haven a bad day are we? My speedo said 170. I mean who would have thought that your would use a spedometer to check your speed. Hmmm. Wanted to no any real riders advice on how I should go about changing my sprockets. After alot of reading prob just gonna go with -1 on the front.
 

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Discussion Starter #7
My 2011 with -1/+2 runs completely out of gear at 135mph
Thank you ZXnasty, that was more of an answer than I got elsewhere. This is my first 600, and first Kawasaki. Had a 955 so going to a 600 is a step backwards and tryn to help that along some. Did a headers back two brothers and k&n air and it def helped and sounds great. Going in this week for the chain, sprockets, fork seals, power commander 5 and a dyno. Tryn to add up the little things.
 

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You will lose a good amount of top speed with that setup. I have 15t front 42t rear and gps clocked my 2020 at 168 that’s the best I’ve done top speed wise on a 636.

108152
 

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Discussion Starter #9
Thanx Rvaughn2. And that's not to bad. Thinkn going 15-43 but ur 15-42 setup doesn't sound bad either.
 

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Thank you ZXnasty, that was more of an answer than I got elsewhere. This is my first 600, and first Kawasaki. Had a 955 so going to a 600 is a step backwards and tryn to help that along some. Did a headers back two brothers and k&n air and it def helped and sounds great. Going in this week for the chain, sprockets, fork seals, power commander 5 and a dyno. Tryn to add up the little things.
Make sure that if you get sprockets you get a speedo healer or something similar. Speedos can be up to like 10% off from factory, which is why you got the responses saying you weren't really going 170.
Changing sprockets will make it even more inaccurate and needs to be corrected.
 

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You will lose a good amount of top speed with that setup. I have 15t front 42t rear and gps clocked my 2020 at 168 that’s the best I’ve done top speed wise on a 636.

View attachment 108152
What app is this? and you just have your phone on you while you ride? I've been looking for a way to get some stats from my rides 😄
 

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Dude we aint crabby. We just get alot of Dudes(I think) claiming casually of impossible speeds...AND WE CALL THEM ON IT.
 

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What app is this? and you just have your phone on you while you ride? I've been looking for a way to get some stats from my rides 😄
yep I have an iPhone it’s called gps speed. Just turn it on and it clocks your Average and top speed.
 

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^^ who else does it report that information to? What's the fine print say?

Automotive black box data does not require a warrant to be used against the driver.... this just serves it up on a plater.
 

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^^ who else does it report that information to? What's the fine print say?

Automotive black box data does not require a warrant to be used against the driver.... this just serves it up on a plater.

dont know don’t care this is used on the track..
 

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look at gearingcommander.com. Its a very cool tool for getting numbers from all kinds of variables - final drive ratios, tire circumference, etc...

In stock gearing (16/43), a 2008 ZX6R can hit a calculated top speed of 155.6mph at 14000rpm. I don't know what redline is for that year though and whether or not the bike can actually reach that number.

With -1/+2 (15/45), it will reach 139.4mph at the same 14000rpm.

And of course the real question is if there is enough horsepower available to reach those speeds. Drag increases as a square of the speed, and taller gearing means less torque available to the rear wheel at a given engine RPM.

Re: the 2020 calculations - gearingcommander doesn't have anything newer than 2015 for the ZX6R. Does anyone have all of the transmission gear ratios from the latest models - let's say a '20 or '21? The numbers they have for the 2013-2015 are:

Sprockets - 16/43
Primary Drive Ratio - 1.900
1st Gear 37/13
2nd Gear 33/15
3rd Gear 37/20
4th Gear 32/20
5th Gear 27/19
6th Gear 26/20
 

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108166

Just swapped the 43t forgot how high the gearing is
look at gearingcommander.com. Its a very cool tool for getting numbers from all kinds of variables - final drive ratios, tire circumference, etc...

In stock gearing (16/43), a 2008 ZX6R can hit a calculated top speed of 155.6mph at 14000rpm. I don't know what redline is for that year though and whether or not the bike can actually reach that number.

With -1/+2 (15/45), it will reach 139.4mph at the same 14000rpm.

And of course the real question is if there is enough horsepower available to reach those speeds. Drag increases as a square of the speed, and taller gearing means less torque available to the rear wheel at a given engine RPM.

Re: the 2020 calculations - gearingcommander doesn't have anything newer than 2015 for the ZX6R. Does anyone have all of the transmission gear ratios from the latest models - let's say a '20 or '21? The numbers they have for the 2013-2015 are:

Sprockets - 16/43
Primary Drive Ratio - 1.900
1st Gear 37/13
2nd Gear 33/15
3rd Gear 37/20
4th Gear 32/20
5th Gear 27/19
6th Gear 26/20
Final drive Sealed chain
Primary Reduction Ratio 1.900 (76-40)
Gear Ratios 1st 2.846 (37-13)
Gear Ratios 2nd 2.200 (33-15)
Gear Ratios 3rd 1.850 (37-20)
Gear Ratios 4th 1.600 (32-20)
Gear Ratios 5th 1.421 (27-19)
Gear Ratios 6th 1.300 (26-20)
 
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