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**sridar1983** · 10-15-2012, 01:27 PM

Originally posted by Samarth 619 View Post

Apart from the ECU, as suggested by Anant bro, sprockets can also be changed to overgear the Duke. Duke 200's setup: 14/43 on .520 chain pitch.

Try fitting one of the following rear sprockets:

1. Karizma's rear sprocket, 40 teeth,
2. Pulsar 180 UG4's rear sprocket, 39 teeth,
3. The very first Pulsar 200 DTSi's sprocket: 38 teeth,

I'm not too sure if these will help you achieve 150 kmph exact, but they should definitely help in a better top speed, if the road is good enough. And with these sprockets, you might lose a little acceleration.

if you change sprocket then ur will have error on Speedo as the speed is calculated RPM and final gear ratio. so pls make a not of that. if you reduce the number of teeth in rear, ur speedo will show lesser speed that the actual. and if you reduce the teeth on front. it will show more speed than actual. (actual means company provided, not GPS)

**ATHUL4R** · 10-19-2012, 02:01 PM

Originally posted by Honda_CBF View Post

Mileage will increase with low traffic. But mileage may go down with heavy traffic, as number of gear shifts and accelerate-deaccelerate-cycle increases. Rideability: upshifting point will increase by few 100rpms. For 10kmph you should stick to 1st gear. 20kmph can easily be done in 2nd gear. Upshifting point (for me) from 1st to 2nd is somewhere around 15-18kmph, on a zero degree incline road.

so its a good for light traffic and highways...

**Honda_CBF** · 10-19-2012, 04:12 PM

Need info regarding hero Honda street's chain set. Specially no. Of fitting holes in rear sprocket and length of chain in links. Can anyone help?

Originally posted by ATHUL4R View Post

so its a good for light traffic and highways...

its great for light traffic & highways. Kinda ok for moderate traffic (feels like riding a big bike

when ridden in uncle mode) and no go for heavy traffic (for me)

**riot** · 10-25-2012, 12:23 AM

Originally posted by sridar1983 View Post

if you change sprocket then ur will have error on Speedo as the speed is calculated RPM and final gear ratio. so pls make a not of that. if you reduce the number of teeth in rear, ur speedo will show lesser speed that the actual. and if you reduce the teeth on front. it will show more speed than actual. (actual means company provided, not GPS)

Dont know about other bikes but Pulsar and Duke speedos calcuate speed according to the speed of front wheel. Hence, it will show the correct speed regardless of the spreocket size.

**icemang** · 10-26-2012, 11:37 AM

I have a question here.

The CBR 250's stock tyre is a 140/70. An alternative is the 130/70. Now, will fitting the 130 instead of the 140 undergear or overgear the bike?

The change to a 130 is an artificial reduction in the rear sprocket size due to lesser circumference of the tyre. Therefore, does this translate into higher speeds at lower revs or the other way round?

Some data from the CBR ownership thread, courtesy nsengg:

The 140 would be taller by 14mm which is indicated in my previous post.

The 130 will have to do 518.94 rotations to cover a distance of 1 km. &
the 140 will have to do 507.35 rotations to cover a distance of 1 km.

Hence for the same number of engine revs per time the 130 will be rotating the same but will be covering a lesser distance (It will actually be travelling slower not faster as mentioned by you).

Another way to put it across would be:
Speed=Distance travelled/Time taken
Hence if you intend to cover the same distance in the same time the bike with a 130 will have to rev more as compared to the bike with the 140.

**Samarth 619** · 11-11-2012, 09:12 PM

Originally posted by icemang View Post

I have a question here.

The CBR 250's stock tyre is a 140/70. An alternative is the 130/70. Now, will fitting the 130 instead of the 140 undergear or overgear the bike?

The change to a 130 is an artificial reduction in the rear sprocket size due to lesser circumference of the tyre. Therefore, does this translate into higher speeds at lower revs or the other way round?

Some data from the CBR ownership thread, courtesy nsengg:

The 140 would be taller by 14mm which is indicated in my previous post.

The 130 will have to do 518.94 rotations to cover a distance of 1 km. &
the 140 will have to do 507.35 rotations to cover a distance of 1 km.

Hence for the same number of engine revs per time the 130 will be rotating the same but will be covering a lesser distance (It will actually be travelling slower not faster as mentioned by you).

Another way to put it across would be:
Speed=Distance travelled/Time taken
Hence if you intend to cover the same distance in the same time the bike with a 130 will have to rev more as compared to the bike with the 140.

Very long post. But let me put it in short, a 130/70 will undergear your bike by a very slight margin, by less than 10%. It means slightly more acceleration, that's it.

**Jay Kumar Azad** · 11-30-2012, 12:57 PM

Originally posted by rreneav1987 View Post

sorry guys.. got a bit confused with the new shifts.. here are the actual read outs before and after sprocketing..

Speeds at 5000RPM with the 40T rear sprocket on my ZMR..

1st Gear - 19kmph
2nd Gear - 29kmph
3rd Gear - 47kmph
4th Gear - 63kmph
5th Gear - 77kmph

Speeds at 5000RPM after changing to 36T rear Sprocket..

1st Gear - 26kmph
2nd Gear - 36kmph
3rd Gear - 55kmph
4th Gear - 71kmph
5th Gear - 86kmph

The Strain on the Engine has reduced and hence on highways.. its gonna be a smooother ride than before

tried Max till 9000RPM in first 3 gears... achieved a pretty decent speed

touched 101kmph at 9000RPM in 3rd gear

yet to touch the top speed..

what top speed U got after this mod?

And which chain U used(p220 or zmr)?

Actually I am also planning to do this mod so seeking help from U?

**madhav766** · 12-03-2012, 08:59 PM

Hey guys, I have a twister that needs new sprockets. I want to go in for a smaller rear or a larger front sprocket, because I don't use the bike anymore and dad finds it difficult to handle the short geared twister. From what I gather, if I do that then gearing will be slightly longer, with sacrifice in pick up and maybe a better top end. Can anybody suggest a sprocket set for my bike?

**aryan rajvanshi** · 12-04-2012, 12:40 PM

Hi guys...need your help!!!
I have a 2010 Honda unicorn with stock gearing and tyres...i wanna change its sprockets to increase acceleration...so plz suggest me appropriate sprockets sizes(both) for my bike.
Thanks in advance....plz help.

**samarth14feb** · 12-05-2012, 02:36 AM

World of Sprockets!

I would like to under gear my bike for acceleration. I own a cbr250r it's a great bike but rattles in 18kmph speed in second gear. Which bikes sprockets will be a direct fit and helpful ? I want it to pull smoothly in second gear from 15kmph so that will be easier in traffic.

**abhisheklalnediya** · 12-05-2012, 11:20 PM

hi,
my ride is 2011 cbz, it will go 51kmph on 5th gear at 4000rpm,
it vibs a lot while riding on 55~65kmph(my usual range)
but once i tried my friend's unicon having same engine of cbz,it went 60+ on 4000rpm with absolutly no vibs
so i need my cbz to run 60kmph at 4000rpm, please help me.

**fayad555** · 12-06-2012, 12:26 AM

Originally posted by abhisheklalnediya View Post

hi,
my ride is 2011 cbz, it will go 51kmph on 5th gear at 4000rpm,
it vibs a lot while riding on 55~65kmph(my usual range)
but once i tried my friend's unicon having same engine of cbz,it went 60+ on 4000rpm with absolutly no vibs
so i need my cbz to run 60kmph at 4000rpm, please help me.

i think xtremes sprocket ratio is 14/43, so try changing the front sprocket to 15 to over gear it. unicorn's 15T front sprocket should fit.

btw, unicorn on stock sprocket does only 50kmph at 4000rpm.

**abhisheklalnediya** · 12-06-2012, 09:20 AM

Originally posted by fayad555 View Post

i think xtremes sprocket ratio is 14/43, so try changing the front sprocket to 15 to over gear it. unicorn's 15T front sprocket should fit.btw, unicorn on stock sprocket does only 50kmph at 4000rpm.

my be he did the over gearing or the meters were wrong.

**abhisheklalnediya** · 12-06-2012, 09:52 AM

Originally posted by aryan rajvanshi View Post

Hi guys...need your help!!!
I have a 2010 Honda unicorn with stock gearing and tyres...i wanna change its sprockets to increase acceleration...so plz suggest me appropriate sprockets sizes(both) for my bike.
Thanks in advance....plz help.

Originally posted by abhisheklalnediya View Post

hi,
my ride is 2011 cbz, it will go 51kmph on 5th gear at 4000rpm,
it vibs a lot while riding on 55~65kmph(my usual range)
but once i tried my friend's unicon having same engine of cbz,it went 60+ on 4000rpm with absolutly no vibs
so i need my cbz to run 60kmph at 4000rpm, please help me.

Originally posted by fayad555 View Post

i think xtremes sprocket ratio is 14/43, so try changing the front sprocket to 15 to over gear it. unicorn's 15T front sprocket should fit.

btw, unicorn on stock sprocket does only 50kmph at 4000rpm.

hi aryan

i think its clear if you refer the above 3 posts
I need more top speed so changing my 14T front sproket to 15 T of unocorn

if you want more accleration, change your 15T front sproket to 14T of cbz.

**albyjose** · 12-06-2012, 02:17 PM

Just out of curiosity,owners are complaining about the pathetic low end torque of pulsar 200 ns.In specs 200 ns have 18 nm torque,which is pretty respectable comparing other bikes in the segment,but this torque is supplied at high rpms only.
Can we use a bigger rear sprocket to make 200 Ns a better city tool,by making ratios shorter?I understand that it will not bring low rpm torque but at lower speeds one could use better torque.Question is can we use its brother's(Duke's),sprocket on this?If not,any other?
Is there any chance of reduction in reliability?Warranty affected?

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