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Old March 11th, 2012, 09:13 PM   #1
jus4fun
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Your favorite sprocket mod

What are the top 2 front sprocket mods?

What are the top 2 rear sprocket mods?

I had heard that going to a 15/42 was awesome.

I need more information. What seems to be the favorite, and why?
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Old March 11th, 2012, 09:23 PM   #2
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Gearing changes really just depend on what you use the bike for, and what you want from it.

For lower highway rpm's, people really seem to like going to a 15 tooth front sprocket.

Personally, I went to a 14/47 sprocket setup because I don't ride highway and wanted some more torque out of corners. 14/47 ftw!!!
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Old March 11th, 2012, 09:29 PM   #3
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Most common mod is probably going from a 14/45 stock setup to a 15/45 setup. Lowers revs a smidge, making highway travel a bit less hectic. But people have gone all the way to a 16T up front, with a little grinding of the sprocket cover.

In the rear, there are a bunch of sizes that work fine, and some people do swear by a 15/42, 15/41, or even 16/41 setup, each of which will lower the revs for a given road speed just a little bit more. But - every little bit you go taller, the harder it is to get rolling from a stop in 1st, requiring more clutch slipping.

Good site to play with all of the combinations is:

www.gearingcommander.com

Some relevant threads with some reviews of different setups here on this site:

Sprocket Setup
DIY- Sprocket Swap
13t front sprocket
15/41 sprocket set up
16/41 Sprocket Review

/thread moved to new-gen tech area
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Old March 11th, 2012, 09:44 PM   #4
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this was the first mod i did to my bike. i have a 15/42 setup right now and i love it. yes, it does reduce the "zippiness" a bit, but i ride on the highway alot and the setup i have reduces rpms and makes it more bearable.

+100 for the gearingcommander site, itll tell you everything you need to know about every combo.

this also helped me in picking a combo
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Old March 11th, 2012, 10:32 PM   #5
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I'm thinking about switching my sprockets out since I have the 650 for commuting now. I think I'll make my 250 into a perma twisty bike
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Old March 11th, 2012, 10:39 PM   #6
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@Jiggles. 14/47! Works with the stock chain length. Gets to redline a lil' quicker, and puts a on your face
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Old March 11th, 2012, 10:52 PM   #7
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Quote:
Originally Posted by choneofakind View Post
@Jiggles. 14/47! Works with the stock chain length. Gets to redline a lil' quicker, and puts a on your face
How about 13/47 or 13/48 just to get real ridiculous. That would put my top speed at 87mph, I'm down for that
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Old March 12th, 2012, 02:33 AM   #8
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I crossed the country at 15:38 but it's because a 38T rear was the only thing in stock locally before my trip. I put a lot of time/miles on 15:41.

Keep in mind, 16" vs. 17" wheels also affect your final drive (OP didn't specify).

Quote:
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How about 13/47 or 13/48 just to get real ridiculous. That would put my top speed at 87mph, I'm down for that
I think Casey, @ninja250, did that ("stunt gearing").
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Old March 12th, 2012, 08:24 AM   #9
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Keep in mind, 16" vs. 17" wheels also affect your final drive (OP didn't specify).
The diameters of the tires are nearly the same between a 130/80-16 or a 130/70-17. The difference in gearing would be a lot more noticeable than the difference in diameter of the tires on 16" wheels or 17" wheels.

@Jiggles, a 13 tooth front sprocket makes the chain turn a tighter corner and reduces life, but a 250 with 13/47 gearing would practically be able to power wheelie
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Old March 12th, 2012, 10:38 AM   #10
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Sounds good to me haha
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Old March 12th, 2012, 12:30 PM   #11
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to the trackday junkies - so the 15t is good for highways and streets, but what about for the track? what do you guys like running for best torque and acceleration in the corners?
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Old March 12th, 2012, 02:02 PM   #12
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Quote:
Originally Posted by choneofakind View Post
The diameters of the tires are nearly the same between a 130/80-16 or a 130/70-17. The difference in gearing would be a lot more noticeable than the difference in diameter of the tires on 16" wheels or 17" wheels.

@Jiggles, a 13 tooth front sprocket makes the chain turn a tighter corner and reduces life, but a 250 with 13/47 gearing would practically be able to power wheelie
Really? It seems to me that the final diameter difference would be even more than 1" and it would have exaggerated the difference for the full circumference.
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Old March 12th, 2012, 03:48 PM   #13
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Well, I might be wrong. Let's do the math out loud. Double check my work in case I miss anything.

pregen

130/80-16
130 x 0.8 = 104 mm tire height
104 x 2 = 208mm = 20.8 cm = 8.18 inches of sidewall/diameter
8.18 + 16 = 24.18 inches final diameter

new gen.

130/70-17
130 x 0.7 = 91 mm tire height
91 x 2 = 182mm = 18.2cm = 7.16 inches of sidewall/diameter
7.16 + 17 = 24.16 inches final diameter

I'd say those are close enough to be considered the same.
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Old February 10th, 2014, 09:36 AM   #14
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I was reading on the Ninja 300 forums and they were saying you could do a 40t sprocket in the rear instead of 15/45? Is that true on the 250 as well?

I live up a 6 mile hill so I'm looking to lower the highway rpm a bit without making 6th gear useless.

Also sorry for the necro but I hate making new threads when threads already exist ;o
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Old February 10th, 2014, 05:50 PM   #15
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I went with a 15/43 setup. It requires a little dragging of the clutch when starting out on steep hills, but at least I can make it through an intersection without changing gears.

Did I mention I also get 10 more miles per gallon! (52.5 stock and 63 with 15/43)
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Old February 10th, 2014, 05:56 PM   #16
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I went with a 15/43 setup. It requires a little dragging of the clutch when starting out on steep hills, but at least I can make it through an intersection without changing gears.

Did I mention I also get 10 more miles per gallon! (52.5 stock and 63 with 15/43)
Weird...that did not happen to me.

15/43 +1
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Old February 14th, 2014, 09:48 AM   #17
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I went to a 15tooth front. While I liked it for highway I did end up changing it back to stock. Just made it more fun to ride for me. I never was bothered by switching gear more often. However with my 05 636 gears are much taller.
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Old February 14th, 2014, 10:25 AM   #18
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Quote:
Originally Posted by gt_turbo View Post
to the trackday junkies - so the 15t is good for highways and streets, but what about for the track? what do you guys like running for best torque and acceleration in the corners?
I have raced on the following;

14/45 - stock and zippy but wanted more at Jennings will be trying 14/47 next time I am there
15/45 - meh, not really that much different aside I got no pull in 6th on the straight
15/43 - Again, no pull in 6th but worked well for the slightly downhill back straight at mid-ohio, you might like it on the bigger tracks
15/42 - About the same as 42, cept I was on a smaller track, it's to tall for tight track sprints
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Old February 14th, 2014, 07:05 PM   #19
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Just put a 15/41 on. Should warm up later this week and will hopefully be able to test it out and report.
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Old February 15th, 2014, 11:15 AM   #20
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...Gearing changes really just depend on what you use the bike for, and what you want from it.

For lower highway rpm's, people really seem to like going to a 15 tooth front sprocket.
Agree with Chone.

Those who ride freeway do like to reduce the RPM speed as much as possible and still be able to have passing power in the top gear if need be. As a frequent Hwy rider I use 15/41 and still outpace most traffic easy.

15/41 @ 8k = 76.3 mph in 6th gear
15/42 @ 8k = 74.5 mph in 6th gear
15/43 @ 8k = 72.8 mph in 6th gear
15/44 @ 8k = 71.1 mph in 6th gear
15/45 @ 8k = 69.6 mph in 6th gear
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Old February 15th, 2014, 11:27 AM   #21
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Hmm, I'm wondering what the best gearing for the track would be since I'm rebuilding my 250 as a track only bike, and a tight/twisty track at that (shenandoah, summit point, wv)

Alternatively I could slap the gearing on my 300 for a track day and switch it back to a 15/45 after.
Would a 13T front be worth it? I'm considering switching to a 13/47 for track days (particularly with my dedicated track bike rebuild coming along...slowly) If I go through with it I'll bring the stock 14T front with me just in case the top end is entirely too low. I'd imagine the top speed to be somewhere in the mid 80s at that point, but the loads of extra acceleration would probably make up for it in the overall lap times and fun.
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Old February 15th, 2014, 11:39 AM   #22
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First off, there is no best gearing. It's track, rider and pace dependant. I have been beat by 15/42 while on stock gearing and vice versa. For example; when I started riding mid-ohio on my r6, the stock gear felt perfect but once I got moving really fast, I went up one in the front only. At putnam 15/42 sucked, went back to stock and was it was t*ts. Play with it... there is no right or wrong answer here.

I feel a 13t would have you shifting like a mad man. Better go with GP shift if you go that route. If you have never been to the track, give stock a go first, take the gears with you, they are a piece of cake to change out during the lunch break. Don't forget your torque wrench.
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Old February 15th, 2014, 11:50 AM   #23
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Luckily I'm already running GP shift since I had problems upshifting while taking a few select corners before, didn't fix everything but it's helped. Luckily I love shifting too haha, it would take me a bit to figure out which gears I want for which corners but the result would likely be super rewarding laps. When it gets closer to summer and my track bike is up and running properly I'll post a thread on it, at the moment though there's nothing thread worthy in the shed and won't be for a few more weeks at least hahaha. I get the feeling that I'll be adjusting quite a few things during my first few trackdays. Since I'm likely to stick with the same track for a while I should be able to eventually find that "sweet spot" with the bike, track, and myself.
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Old February 20th, 2014, 07:17 PM   #24
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I tried the 15/41 setup, but went back to the stock front sprocket. The stock sprocket has a rubber insert, the aftermarket one did not. I did not like the extra vibration I felt running the 15 tooth solid sprocket. The 14/41 combo feels good to me, acceleration is decent and I have longer legs on the freeway!
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Old March 29th, 2014, 03:45 PM   #25
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Hi guys I'm pretty new to this bike In fact I just bought the bike couple days ago with 6700+ miles. The bike runs perfectly , nothing wrong with it, and verything on it is stock except the exhaust. I was thinking of doing 15/42 sprocket combo + new chain. I rarely going on highway but I love to ride fast and in my area west palm beach florida there isnt much traffic so I could speed. My question is, if I go with that combo does it affected the tire? Like do I have to get a different size of rear tire?
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Old March 29th, 2014, 04:21 PM   #26
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I likes the 15/43 the best for street riding as I am 200 lb. These things are easy to over gear. And from my experience racing the mile they will not push the 15/41 past 11,500 rpm. And the max power is at 12000-12500. So the bike slows down in sixth gear when going full throttle for a mile.
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Old March 29th, 2014, 05:57 PM   #27
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15/43 for me too.
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Old March 29th, 2014, 06:04 PM   #28
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I'm just a street rider, so I run 15/44. Plenty peppy after the first 40 feet or so. Turns 8K rpm at indicated 70 mph in top gear.
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Old March 29th, 2014, 10:58 PM   #29
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Got to test my 15/41 setup. Thought something was wrong as everything felt similar, except then I realized I was in one gear LOWER than I thought. I love having that true "overdrive" gear now (6th).
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Old October 9th, 2014, 12:41 AM   #30
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What brand sprocket/chains are you guys using and where are you buying from? I don't much like the pricing the stealership is giving on this.

Resorting to having them do it because labor is going to be about the same as buying the tools to do it myself. They said they would install whatever I brought them. I want the o-ring chain and prefer this 15-45 sprocket config.
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Old October 9th, 2014, 07:12 AM   #31
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All the info you need Trey

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Old October 10th, 2014, 08:42 PM   #32
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I left the 14T engine sprocket as is, and replaced the 45T rear sprocket with a 42T sprocket. Drops engine speed by a factor of 42/45 = 0.93.

No need to remove links from the chain (new).

In 6th gear at 13,000 rpm the bike should be going a calculated speed of 96 mph -


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Old October 13th, 2014, 07:47 AM   #33
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If anyone is looking for a gearing chart for the 08-12 250r I have one here:

http://garth285.com/misc/08-250-GC.xls

You can enter in your tire sizes and gearing and it will tell you things like top speed, gear change speed, etc...

Check it out!


I am going for top speed to I picked up a 15,16, and a 40t
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Old October 13th, 2014, 07:58 AM   #34
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I left the 14T engine sprocket as is, and replaced the 45T rear sprocket with a 42T sprocket. Drops engine speed by a factor of 42/45 = 0.93.

No need to remove links from the chain (new).

In 6th gear at 13,000 rpm the bike should be going a calculated speed of 96 mph -

How lazy does the bike feel now? This is my biggest worry with a mod to drop the revs.
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Old October 13th, 2014, 01:46 PM   #35
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How lazy does the bike feel now? This is my biggest worry with a mod to drop the revs.
I discovered my pregen Ninja came with 15/42 sprockets (stock being 14/45). The rpms still feel high to me for the freeway, cannot imagine stock @ 75 mph running 15% higher. But, the bike is not a rocket from a stop, I have to be on the ball when I filter to the front, and scope out the lead cars that I'd be between before doing so. I wish I knew what stock gearing felt like.

Quote:
Originally Posted by garth285 View Post
If anyone is looking for a gearing chart for the 08-12 250r I have one here:

http://garth285.com/misc/08-250-GC.xls

You can enter in your tire sizes and gearing and it will tell you things like top speed, gear change speed, etc...

Check it out!

I am going for top speed to I picked up a 15,16, and a 40t
Also try gearingcommander.com site ... 1104 bikes
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Old October 13th, 2014, 02:35 PM   #36
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yeah I have used gearing commander but found they are really not accurate
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Old October 13th, 2014, 02:39 PM   #37
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every few 10k miles i will lube the chain and sprockets... i think this is a good mod.
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Old October 13th, 2014, 03:02 PM   #38
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yeah I have used gearing commander but found they are really not accurate
I find that GC (for Ninja 250R at least) is about 10% optimistic on mph, just like my speedometer -- which I find a little odd. You can always GPS your own bike, and then punch in your own ratios. Then your sprocket numbers should be accurate.
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Old October 13th, 2014, 04:25 PM   #39
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Originally Posted by BlownWideOpen View Post
How lazy does the bike feel now? This is my biggest worry with a mod to drop the revs.
With the stock set-up, engine speed at 60 mph seemed a bit too high at about 8700 rpm. Going to a 42T rear sprocket engine speed is now 8100 rpm.

It doesn't feel sluggish at all - considering that it gained a couple of ponies from mid range to top end with the full system exhaust plus now it pulls further as it rev's higher -


Last futzed with by C-Bass; October 13th, 2014 at 08:57 PM.
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Old October 18th, 2014, 04:02 PM   #40
Linkin
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Name: Linkin
Location: Sydney, Australia
Join Date: Jun 2014

Motorcycle(s): Kawasaki ZXR250C Ninja

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I ordered stock gearing JT sprockets, but found that the rear sprocket was larger, with the same number of teeth - this apparently gives better acceleration? It would explain why I couldn't get the bike above 145KM/h (90MP/h) in top gear.

I don't race or do a lot of highway travel so it seems to work fine
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