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Old 01-01-2013, 06:18 PM   #1
I<3My750
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chain&sprocket

i was wondering what cain and sprocket ratio to put on my bike, i am new to this anyone wan to inform me in what i should use and what the outcome would be
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Old 01-01-2013, 06:21 PM   #2
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Do you not like stock? What kind of result do you want?

-1 tooth in the front and +2 teeth in the back is popular, provides an acceleration gain.


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Old 01-01-2013, 06:32 PM   #3
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Re: chain&sprocket

-1 front +2rear works nice for a little more drive and snap but needs a speedo healer to fix speedo. It reduces top speed though. Mileage will suffer a bit.
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Old 01-02-2013, 09:39 AM   #4
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Re: chain&sprocket

It has been discussed about a billion times on here, the search button is your friend.

Also, if you want advice, you need to give more information. What's your goal? More acceleration, better fuel mileage or what?
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Old 01-02-2013, 10:06 AM   #5
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Re: chain&sprocket

You need -8 / +17. That's how all the cool stunters roll, so it's got to be good.

Or +6 / -8 so you can hit 300 mph.
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Old 01-02-2013, 10:23 AM   #6
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Re: chain&sprocket

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Originally Posted by davidhar View Post
You need -8 / +17. That's how all the cool stunters roll, so it's got to be good.

Or +6 / -8 so you can hit 300 mph.


Legit point!
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Old 01-02-2013, 02:10 PM   #7
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Re: chain&sprocket

im looking to gain a little bit more highspeed without loosing so much acceleration
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Old 01-02-2013, 02:20 PM   #8
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You won't gain high-speed. The bike is horsepower limited. Meaning it will likely run out of HP to push through the air before it runs out of rev/gearing.
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Old 01-02-2013, 02:21 PM   #9
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And where is it you ride that you are needing more mph out of a bike capable of about 170-180mph real speed?

Last edited by Moto_Joe; 01-02-2013 at 02:24 PM.
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Old 01-02-2013, 02:21 PM   #10
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Re: chain&sprocket

Maybe one tooth lower on the rear? . Power is the real limiter from top speed, not so much gearing. A 600 loses no top speed with +1 or 2 on the rear, since its top speed is when power runs out. Your 750 has a touch more grunt though, so it may work. Is 140+ mph really not enough?
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Old 01-03-2013, 06:38 AM   #11
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Re: chain&sprocket

stock gearing and ad a nitrous kit, once you reach terminal speed just hit the button
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Old 01-03-2013, 10:37 AM   #12
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Re: chain&sprocket

Quote:
Originally Posted by TAgsxr1k View Post
-1 front +2rear works nice for a little more drive and snap but needs a speedo healer to fix speedo. It reduces top speed though. Mileage will suffer a bit.
I have been very happy with this Combo. (but, I gear'd mine for the street. Where I live)
You cant't pull to redline in top gear now. How do you plan to go faster? Is this a street bike?
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Old 01-03-2013, 10:51 AM   #13
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Re: chain&sprocket

As Joe said, you can't gain any more top speed without more power (lots more). You would need a nitrous or turbo. It's not a gearing issue, but a power issue. If you really want more top speed the easiest and most cost effective way is to just upgrade to a 1000cc bike.
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Old 01-03-2013, 01:17 PM   #14
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Re: chain&sprocket

If you want to study this, go to this site - it gives you your default out-of-the-box setup by year and model. It shows you what will happen when you start changing things on those sprockets. It is very accurate!

www.gearingcommander.com
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Old 01-03-2013, 02:34 PM   #15
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Quote:
Originally Posted by ajsenol View Post
If you want to study this, go to this site - it gives you your default out-of-the-box setup by year and model. It shows you what will happen when you start changing things on those sprockets. It is very accurate!

www.gearingcommander.com
Not as accurate as you may think. Not unless you are very very careful about parameters. Things like tire diameter, rev limit, etc make a huge difference.

It is good but too many people aren't smart enough to take it for what it is.... math. Math requires all the input numbers to be accurate... shit in=shit out.
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Old 01-03-2013, 02:48 PM   #16
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Re: chain&sprocket

Quote:
Originally Posted by Moto_Joe View Post
Not as accurate as you may think. Not unless you are very very careful about parameters. Things like tire diameter, rev limit, etc make a huge difference.

It is good but too many people aren't smart enough to take it for what it is.... math. Math requires all the input numbers to be accurate... shit in=shit out.
You don't have much faith in people.

If you manage to put the simple stuff there, it really is pretty accurate.
At higher speeds you get some tire slippage, but at least up to 250 km/h it was dead on for my bike.
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Old 01-03-2013, 02:50 PM   #17
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Quote:
Originally Posted by -JK750- View Post
You don't have much faith in people.

If you manage to put the simple stuff there, it really is pretty accurate.
At higher speeds you get some tire slippage, but at least up to 250 km/h it was dead on for my bike.
Check your theoretical top speeds, rpm, and how it changes with changes in tire size.. example 180/55 is stock but put a 180/60 on it .

A lot of it is just theoretical at the top. And tire sizes wvwm with wear or brand to brand change a lot
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Old 01-03-2013, 02:54 PM   #18
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Re: chain&sprocket

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Originally Posted by Moto_Joe View Post
And tire sizes wvwm with wear or brand to brand change a lot
And with tire pressure - plus at high speed the centripetal force will increase tire diameter enough to make a difference.
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Old 01-03-2013, 03:03 PM   #19
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Re: chain&sprocket

Quote:
Originally Posted by Moto_Joe View Post
Check your theoretical top speeds, rpm, and how it changes with changes in tire size.. example 180/55 is stock but put a 180/60 on it .

A lot of it is just theoretical at the top. And tire sizes wvwm with wear or brand to brand change a lot
True, but for Supercorsa SC2 180/55 -1/+4 gearing at the limiter, it was just correct (GPS and speedohealer).

I think they advertise that new Dunlops are pretty stable, but some tires have big differences at different speeds.

Dunlop
Quote:
virtually no circumferential tire growth
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Old 01-03-2013, 03:49 PM   #20
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Re: chain&sprocket

-1, +2 is the way i bought my bike, went to do the mod and low and behold i had the same sprocket smh.

So its not very aggressive in my opinion, but i do weigh 240lbs
Can barely clutch it up in 2cd and ppl said -1, +2 was a shore shot ijs,

but ur bike is lighter and im sure u are too so it might work for u
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