47T Rear Sprocket

[bobit69]

Would this http://cnb-host4.clickandbuild.com/cnb/shop/bikeparts4u?productID=121&op=catalogue-product_info-null&prodCategoryID=263 fit on a SILVER :lol: SK3

Or can anyone onle else suggest a good 47T alternative. Am off to the Isle of Man soon(ish) and want a bit more oomph at lower speeds, as I am sure I will be a bit scared of going too fast, i.e. have more fun at lower speeds!

Cheers,

[jonboy]

It'll fit providing your chain's long enough. If you have an "S" then the standard chain will be too short (108 links) but the naked's chain (110 links) will be okay. Best to change both sprockets and the chain at the same time, in which case it won't be a problem.

47 teeth... so you want to do wheelies everywhere eh? :lol:


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[bobit69]

Fair enough, will be on the look out for new longer chain then!

Wheelies everywhere (specially over balou(sp) bridge). I find that I can get the SV up pretty easy but I wouldn't mind making it easier in second. :twisted:

Bit like this

Thanks!http://upload3.postimage.org/55445/McCullaghpractice.jpg (http://upload3.postimage.org/55445/photo_hosting.html)

[Valman]

It will fit, but I'm pretty sure you need more than 110 links on the chain, although I could be wrong.

To be honest it hasn't turned my SV into a wheelie machine and my SV goes quite happily without trying to throw me off every time I whack the throttle fully open. I was a little disappointed as everyone was warning me to be really careful when I was getting it done, I had only been riding for 6 months, but I hardly noticed the difference to be honest.

[leegriffiths128]

Thinking of making this mod myself.

So for the 47 tooth sproket I'll need at least a 110 link chain on my K3 S ?
What would be the ideal link number for the chain and can anyone recommend stockists ?

Thanks guys

[jonboy]

To be honest it hasn't turned my SV into a wheelie machine and my SV goes quite happily without trying to throw me off every time I whack the throttle fully open. I was a little disappointed as everyone was warning me to be really careful when I was getting it done, I had only been riding for 6 months, but I hardly noticed the difference to be honest.

Yes I know you feel this way Tahir but I honestly can't fathom it. My 46 tooth sprocket is really fab.


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[UlsterSV]

I have ordered a 47 teeth rear, 15 front sprocket setup for my '01 SVS. I'm fitting a 110 link gold DID chain. :wink:

[Cloggsy]

I'm fitting a 110 link goldie looking chain. :wink:

Bling bling (even though they've just been dropped by their record company :!:)

[Toypop]

For my benefit could someone remind us of the default sprocket sizes of the naked and faired?

I was wondering whether to get a naked chain and sprocket set or whether something smaller (as in giving smaller gears) is required?

The gearing on the SVS is the biggest disappointment for me as I reckon it makes the bike feel a bit sluggish compared to my old naked Bandit.

My Bandit had a gold chain by the way and I reckon it looked great.

[Cloggsy]

For my benefit could someone remind us of the default sprocket sizes of the naked and faired?

44 on an 'S'

45 on an 'N'

:wink:

[Toypop]

Blimey so at what speed would it run out of rev's in 6th with a 47 as per UlsterSV's posting (is the 15 front standard?) and what rpm would it be doing at 70?

[jonboy]

My 46 makes only about a 100 rpm difference at 70, and (on my private test track) I've had 133 out of it with a tiny bit more to go, so in the real world you'll notice no difference in top speed but more punchy acceleration. The cheapest "performance" mod going.


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[Carsick]

With a 46 I've found I have an identical top speed but now it will redline in top.

[fizzwheel]

it will redline in top.

I think Liz manages that with standard gearing :lol:

[Carsick]

it will redline in top.

I think Liz manages that with standard gearing :lol:
Impressive if she can. I've genuinely tried on a long motorway run and it simply wouldn't with standard gearing but now will.

[fizzwheel]

it will redline in top.

I think Liz manages that with standard gearing :lol:
Impressive if she can. I've genuinely tried on a long motorway run and it simply wouldn't with standard gearing but now will.

my last post was made purely tongue in cheek, Shes said shes nearly maxxed it out in 6th but not quite...

[Scoobs]

it will redline in top.

I think Liz manages that with standard gearing :lol:
Impressive if she can. I've genuinely tried on a long motorway run and it simply wouldn't with standard gearing but now will.

my last post was made purely tongue in cheek, Shes said shes nearly maxxed it out in 6th but not quite...

You need to really max it in 5th if you want to max it in 6th and duck down and get everything tucked in. I've been 200rpm max from being maxed but I am sure it could have done it.

[fastdruid]

It's possible but not IMO on the flat, a tail wind/slipstream/hill OTOH...

I've managed it the once, 2000 SV650S tucked in about 1ft off the back of a mate (on a VTR1000 firestorm) down a hill. :D

Extensive early morning testing on er a private road says it's not possible otherwise, it gets close but not enough to hit the limiter. :D

Druid

[Blue_SV650S]

I actually generated a bit of software to calculate the theoretical speeds in each gear with different gear ratios/sprocket combinations. It was actually based around my R6 racebike so I could calculate the effects of my sprocket combinations. But as I now have an SV too (roadbike) and was interested for myself, I have updated the software with the ratios in a curvys ‘box. It seems others might be interested too ;)

Does anyone have some webspace that wouldn’t mind hosting it if I was to email them it? Its really straightforward to use … you can even output the data to a textfile :)

[Carsick]

I'll host it if you want. Send it to michael.carrick "at" gmail.com

[jonboy]

With a 46 I've found I have an identical top speed but now it will redline in top.

Yes I've found the same - well it was almost touching the red when I ran out of private road :lol: .


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[Blue_SV650S]

I'll host it if you want. Send it to michael.carrick "at" gmail.com

I'll email you it when I eventually get home later this evening, we can post the link up :)

BTW I fitted a 14t front sprocket to mine, this equates to roughly the same as 15f 47r, it a bit more lively, but not really that rude, to be honest I wouldn't bother changing 1t (rear) for road use, the difference will hardly be noticeable. I think I could go 14f 47r and it’d still be ok for my purposes …

Yo can all make your own decisions though when you see the actual figures :)

....

Oh and BTW one thing you need to do to get accurate data out is to measure the circumference of your rear wheel as this is used in the calculations. I have set the default as 200cm as that ballpark for the 17” wheel, my rear tyres is actually 199cm, circumference. This is quite important to measure. A worn tyre will have a different circumference to a new one, one manufacturer will have a slightly larger tyre than another etc etc … so to make it tailored for your bike you need to measure it. Although the default is 200cm, this ‘circumference’ figure is easily configurable/selectable at runtime.

[Blue_SV650S]

Right, managed to get the files to Carsick (eventually :oops: ) and he has kindly hosted them :)

There are 3 files, GearRatioCalculator_SV650.exe, GearRatioCalculator_SV1000.exe and COMDLG32.OCX.

Basically I have looked up the gearbox ratios for both the SV650 (all years) and the SV1000 (for the 1000cc impostors amongst us :lol:) and generated two separate executables using this data. No prizes for guessing which file is for which bike!! :D

Whichever one you want, copy to your pc. Some of you will also need the .OCX file too (for the dialog boxes) so save this to the same folder too. Then enjoy :)

Here is the URL for the files/folder that Carsick has hosted:-

http://bikes.carsick.me.uk/GearRatioCalc/

If anyone has any questions or not sure what to do, then just shout :)

I did write this for myself and I am not a software engineer by trade so, so if you don’t like the colour scheme or summin, well I don’t care :D but if there is any constructive criticism, I’d be happy to hear it.

Oh and as with all good software realises I better give a short disclaimer … ;) … I am sure there is proper legal jargon, but basically … don’t come crying to me (or to me via your lawyer)!!! :D

[jonboy]

That's really cool, thanks :thumbsup: .


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[Skip]

That is cool! Nice one! :D

[jonboy]

I can also plan how I'm going to gear my much desired SV1000 for when I get it :twisted: .


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[KayDee]

Right, managed to get the files to Carsick (eventually :oops: ) and he has kindly hosted them :)

There are 3 files, GearRatioCalculator_SV650.exe, GearRatioCalculator_SV1000.exe and COMDLG32.OCX.

Basically I have looked up the gearbox ratios for both the SV650 (all years) and the SV1000 (for the 1000cc impostors amongst us :lol:) and generated two separate executables using this data. No prizes for guessing which file is for which bike!! :D

Whichever one you want, copy to your pc. Some of you will also need the .OCX file too (for the dialog boxes) so save this to the same folder too. Then enjoy :)

Here is the URL for the files/folder that Carsick has hosted:-

http://bikes.carsick.me.uk/GearRatioCalc/

If anyone has any questions or not sure what to do, then just shout :)

I did write this for myself and I am not a software engineer by trade so, so if you don’t like the colour scheme or summin, well I don’t care :D but if there is any constructive criticism, I’d be happy to hear it.

Oh and as with all good software realises I better give a short disclaimer … ;) … I am sure there is proper legal jargon, but basically … don’t come crying to me (or to me via your lawyer)!!! :D

Can you knock up a MAC OSX version? :lol:

[Blue_SV650S]

Can you knock up a MAC OSX version? :lol:

Please don't swear like that on a forum :D

[jonboy]

:lol: Too right!


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[Carsick]

I don't mind knocking up a java applet version if you send me the formulae.

[Blue_SV650S]

I don't mind knocking up a java applet version if you send me the formulae.

Well if you like :D … I could give you the source, but most of it concerns the GUI, the only bit you are concerned with would be the actual calculations function (and that is what you asked for :D). So this is the fundamental logic/maths/calculations behind it all!!! in Pseudo code format, with comments (depicted by/started with a ‘ ):-

‘If wheel was turning at engine speed, with wheel circumference in cm; work out distance that would be travelled in miles per hour
SpeedCalculationWithoutReduction = ((WheelCircumfarance/100000) * (RPM * 60)) * 0.621371)

‘ now work out reductions:-

Reductions = primaryreduction * gearratio * (rearsprocket / frontsprocket) ‘gearratio is the gearbox reduction e.g. from the specs, 6th is 23/27 (0.851), primaryreduction is also from specs

‘ Now reduce the wheel speed using the calculated overall reductions:-

SpeedInGearAtRPM = SpeedCalculationWithoutReduction / Reductions


‘ Here are the gear ratios for SV650:-
‘Pimary - 2.088 (71/34)
‘1st - 2.461 (32/13)
‘2nd - 1.777 (32/18)
‘3rd - 1.380 (29/21)
‘4th - 1.125 (27/24)
‘5th - 0.961 (25/26)
‘6th - 0.851 (23/27)

‘Standard sprockets for an SVS 44rear 15front

So a worked example:-
Input:-
200cm circumference, 10500rpm, 6th gear, 15t Front, 44t Rear.

SpeedCalculationWithoutReduction = ((200/100000) * (10500 * 60)) * 0.621371) = 782.9275
Reductions = (71/34) * (23/27) * (44 / 15) = 5.21801
SpeedInGearAtRPM = 782.9275/5.21801 = 150.0433

i.e. at 10500rpm in top you would theoretically be doing 150.0433mph!!!

Clear?? :D

[Carsick]

Seems pretty clear. I'll knock something up tomorrow or at the weekend when I have a spare half an hour.

[valleyboy]

Any chance of knocking one up for a Kwak ZX-6R B1H ?? PLEEASEEE!!!! Im 'tempted' to fit a 14 F 41 R insted of 15/40 and would like to know what I'll be giving up in each gear.. and mileage differences caused by the speedo reading from front sprocket etc....

dont know whats waht, coppied from Manual...

Primary Reduction Ratio: 2.022 (89/44)
Overall Drive Ratio 6.223 (Top Gear)
Gear Ratio:
1st 2.923 (38/13)
2nd 2.055 (37/18)
3rd 1.722 (31/18)
4th 1.450 (29/20)
5th 1.272 (28/22)
6th 1.153 (30/26)

Final Reduction Ratio: 2.666 (40/15)


ta...

[Blue_SV650S]

I can knock you a version up, sure, but for now if you click 'custom box' on the left, you can then enter in the relevent data and play away.

As I am kind, I'll do it quickly myself :D

Here is the output of the 'saved file' for you if you were doing 15,000rpm (I presume that is about the redline?) and a rear wheel of 200cm. standard sprockets

Saved on:- 23/03/2006 22:31:49

ZX-6R B1H Posible configuration 1


Speeds with above configuration:-
Speed in gear1 = 70.97 MPH @ 15000rpm
Speed in gear2 = 100.94 MPH @ 15000rpm
Speed in gear3 = 120.46 MPH @ 15000rpm
Speed in gear4 = 143.06 MPH @ 15000rpm
Speed in gear5 = 163.07 MPH @ 15000rpm
Speed in gear6 = 179.91 MPH @ 15000rpm

General info:-
Wheel circumferance = 200cm
Front Sprocket = 15 teeth
Rear Sprocket = 40 teeth
RPM selcted at save time = 15000

Ratios:-
Primary reduction = 2.022
Gear1ratio = 2.923
Gear2ratio = 2.055
Gear3ratio = 1.722
Gear4ratio = 1.450
Gear5ratio = 1.272
Gear6ratio = 1.153


'''''''''''''

then with new sprocket combo

Saved on:- 23/03/2006 22:32:54

ZX-6R B1H Posible configuration 2


Speeds with above configuration:-
Speed in gear1 = 64.62 MPH @ 15000rpm
Speed in gear2 = 91.91 MPH @ 15000rpm
Speed in gear3 = 109.69 MPH @ 15000rpm
Speed in gear4 = 130.26 MPH @ 15000rpm
Speed in gear5 = 148.49 MPH @ 15000rpm
Speed in gear6 = 163.82 MPH @ 15000rpm

General info:-
Wheel circumferance = 200cm
Front Sprocket = 14 teeth
Rear Sprocket = 41 teeth
RPM selcted at save time = 15000

Ratios:-
Primary reduction = 2.022
Gear1ratio = 2.923
Gear2ratio = 2.055
Gear3ratio = 1.722
Gear4ratio = 1.450
Gear5ratio = 1.272
Gear6ratio = 1.153

[valleyboy]

Ta very much :) red lines at 15,500 rpm... but I shift just before then anyway ;)

Yikes! bikes got an advertised top speed of 165 mph.... wish it would do 180 though :twisted: but at least I know roughly how much I loose with new toothing :)

[Blue_SV650S]

Ta very much :) red lines at 15,500 rpm... but I shift just before then anyway ;)

Yikes! bikes got an advertised top speed of 165 mph.... wish it would do 180 though :twisted: but at least I know roughly how much I loose with new toothing :)

This is where we come down to theoretical top speed and what is actually attainable. You can presume that your bike would never pull to 15k+ in top with stock gearing. It might just do it with your desired combo though!! :)

[Andy13_uk]

i had thought about this in the past, as when going top speed there is loads of 6th gear left just air restance makes it stop :(

On a curvy would a 46t make it readline and make acceration better but not loase any top end?

[Blue_SV650S]

i had thought about this in the past, as when going top speed there is loads of 6th gear left just air restance makes it stop :(

On a curvy would a 46t make it readline and make acceration better but not loase any top end?

Indeed drag/air resistance is the limiting factor. There will be a ‘sweet-spot’ with the gearing where you will be able to reach top revs, but only just. Too tall gearing and the bike probably won’t be able to reach the same top speed as one that is slightly lower geared as the engine ‘bogs down’. Gear too low and you run out of revs too soon!!! Unless you know the drag of the bike then this is experimental only I am afraid.

However, I have got a 14 44 on mine and that is still theoretically good for ~140mph, and lets face it, that is more than enough for a road bike!! :) With this gearing I believe with a long enough straight it’d pull that all the way to the line. Unless you do motorway I’d recommend a 14 front. You should be able to get away with the same chain too :) A 14 front is equitable to about a 47 rear (15 front).

[Carsick]

I have 15/46 on mine. I can pull all the way to the redline and my speedo shows 137 at that point.
I am of the opinion that I have a fairly optimum setup.

I have an sk4, btw.

[valleyboy]

Ive not red lined my bike in 5th or even attempted 6th yet..... red lined in 4th though :twisted: that was still near enough 140 mph.... and I was going up a hill at that point as well :lol:

Gotta have balls of steel to try and do that down hill.... a dry evening in summer for me then :twisted: