[ajmarshall1981]

im thinking about goin -1 in the front and +2 in the back on my 929. where does the speedometer get its reading from?? some people say the sprocket, front wheel,rear wheel,chain etc. i had a 600rr and my speedo was off by 5mph at 55mph because of this. i know a speedohealer will fix the issue. i dont want to buy one though.

 

[bladeracer]

im thinking about goin -1 in the front and +2 in the back on my 929. where does the speedometer get its reading from?? some people say the sprocket, front wheel,rear wheel,chain etc. i had a 600rr and my speedo was off by 5mph at 55mph because of this. i know a speedohealer will fix the issue. i dont want to buy one though.

The speed sensor is on top of the transmission on the 929/954.

 

[RICK-ITFC]

Really never know why riders change the gearing for the road,(track yes) but not road. The 929 has great eccelaration and top end and as far as i can see after 30,000 miles the balance is great.As they say each to there own, just dont see the point. Anyone else have a view on this!!!

 

[bladeracer]

Really never know why riders change the gearing for the road,(track yes) but not road. The 929 has great eccelaration and top end and as far as i can see after 30,000 miles the balance is great.As they say each to there own, just dont see the point. Anyone else have a view on this!!!

I _highly_ recommend lowering the gearing on sportsbikes. -1 off the front is a great start.
Nobody has need of the top speeds of modern bikes and lowering the gearing gets the revs up higher into the power and really wakes the bike up.
Have you actually tried it yourself?

 

[ajmarshall1981]

im a bigger rider and -1/+2 is called the wheelie button where im from. i like more torque. i dont care for high end speed cause 150mph is good enough for me. to each their own.

 

[bladeracer]

im a bigger rider and -1/+2 is called the wheelie button where im from. i like more torque. i dont care for high end speed cause 150mph is good enough for me. to each their own.

Lower gearing doesn't give you more torque. All it does it raise the RPM at the same road speeds so you have more power on tap.
I'm 240lbs naked and run 15/47 on my 929.

 

[ajmarshall1981]

what i meant was feel of power. sorry

 

[RICK-ITFC]

Yes changed gearing on smaller bikes Mainly for more top. But i have always been happy with the balance of the bike as it is.For me there is not enough incentive to try and have a speedo that lies.I can power wheelie if i so desire in second the eccelaration is controlerble wet and dry. I hear what you say about keeping in the band and for the track i would.But i belive you need a good balance for the open road, tyres, brakes suspension and performance. If i rode on perfect and dry roads all the time i would have more of a race set up but i dont. But as i said each to there own......

 

[bladeracer]

Yes changed gearing on smaller bikes Mainly for more top. But i have always been happy with the balance of the bike as it is.For me there is not enough incentive to try and have a speedo that lies.I can power wheelie if i so desire in second the eccelaration is controlerble wet and dry. I hear what you say about keeping in the band and for the track i would.But i belive you need a good balance for the open road, tyres, brakes suspension and performance. If i rode on perfect and dry roads all the time i would have more of a race set up but i dont. But as i said each to there own......

What do you mean you changed gearing for more top?
The speedo already lies so I don't consider that to be relevant at all.
You should ride with the bike in the power whether you're on the road or the track - that's where engines are designed to be run. Lowering the gearing lets you do so in a higher gear.

 

[RICK-ITFC]

Correct me if i am wrong, but lower gearing i.e. smaller rear sprocket will increase you top spead, less eccelaration i know but as i said on a smaller (slower ) bike. I know we were talking about front and back so the top speed will not change and that it changes the revs in each gear, so that you are on the power more, i just prefere the balance as it is in the wet as i personaly feel the power more controlerble as is. But i do hear what your saying..

 

[bladeracer]

Correct me if i am wrong, but lower gearing i.e. smaller rear sprocket will increase you top spead, less eccelaration i know but as i said on a smaller (slower ) bike. I know we were talking about front and back so the top speed will not change and that it changes the revs in each gear, so that you are on the power more, i just prefere the balance as it is in the wet as i personaly feel the power more controlerble as is. But i do hear what your saying..

If you modify the bike to put out _significantly_ more power it may be able to pull a higher top speed with raised gearing.
Generally though raising _or_ lowering the gearing will reduce your top speed.
I can only claim familiarity with sportsbikes but I'm not aware of any bike that will actually pull a higher top speed by raising the gearing.
The SRAD750 is probably the closest I've found as they're geared to pull something like 310kph at redline in sixth but they're only capable of around 270kph about 1500RPM short of redline (they'll pull 270kph in fifth and sixth). By lowering the gearing it's _possible_ that it might be able to pull a few more kph but I never tried it myself.

 

[RICK-ITFC]

They did a test here on the new hyabusa, to see if it would pull a true claimed 200mph needless to say it didnt. They changed the exhaust to a full race system, did a remap , powercommander, taped up the gaps and still no joy. They then put a bigger rear sprocket on the rear only and finally hit the 200mph mark..210mph i think it was, so there must be some truth in it ...mind you it was only a very small increase.As a matter of interest what float your boat more ....top speed or eccelaration !! or is it a combination of both.

 

[bladeracer]

They did a test here on the new hyabusa, to see if it would pull a true claimed 200mph needless to say it didnt. They changed the exhaust to a full race system, did a remap , powercommander, taped up the gaps and still no joy. They then put a bigger rear sprocket on the rear only and finally hit the 200mph mark..210mph i think it was, so there must be some truth in it ...mind you it was only a very small increase.As a matter of interest what float your boat more ....top speed or eccelaration !! or is it a combination of both.

The gearing didn't allow it to pull the speed, the extra power did. If they'd only lowered the gearing it would've gone slower not faster.
But I've never heard of a test of a Busa breaking 200mph and I've certainly never heard any claim of it being able to do so. The highest genuine speed I ever heard of in a test was 314kph on a totally stock bike - about 192mph.

 

[RICK-ITFC]

go on tinternet have a look at a mag called TWO WHEELS ONLY...now called visor down. good mag! like i said it took a lot of work, money and time and over a two day period. Might be worth a read. Cant remember when it was done but if i find the mag i will let you know !!!:thumb:

 

[RICK-ITFC]

oooops just noticed i put 210mph fat fingers ment 201mph. sorry!!

 

[bladeracer]

go on tinternet have a look at a mag called TWO WHEELS ONLY...now called visor down. good mag! like i said it took a lot of work, money and time and over a two day period. Might be worth a read. Cant remember when it was done but if i find the mag i will let you know !!!:thumb:

If you do find it can you scan or photograph the article and post it? I'd be interested to see how much work was involved in getting the extra few mph out of it.

 

[RICK-ITFC]

yes know prob, will have a good look, will have to scan it at work as mine is buggered,but well worth a read, like i said there was a lot of work involved but it is put through a speed trap not based on the speedo, as we all they tell us what we want to see!!!!!