Simple sprocket question.

[Coxyzxr]

What's going to give better acceleration.

1 tooth down on the front?

or

1 tooth up on the rear?

I know both. But individually?

Kind regards
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**WAS FITTED "WRONG WAY ROUND" !** CANT ACCOUNT FOR THE STUPID !

[Wozza]

1 down on the front, but it won't make a massive difference.

[Mr Hammers]

A change of 1 tooth on the front equates to 3 or 4 on the rear, I think.
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A Guide To Powerbands

[Coxyzxr]

[Kickstart]

Hi

Basically 1 tooth on the front will have more effect than 1 on the back. Looking at ZXR750L gearing (16:44) 1 tooth down on the front would be the same as 2.75 teeth up on the back.

How much it will help acceleration will depend on what is the limiting factor. If traction or wheelies are the limiting factor in 1st then no great help, and in any other gear you could probably just change down a gear to gain the same advantage.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Coxyzxr]

[Wozza]

[Kickstart]

Hi

Red line doesn't really indicate where the power / torque ends. It is actually torque that is the important bit (power just means that you can gear it lower for the torque to be geared down less).

Purely by chance in the bath this morning I was reading an old copy of PB with an article on the ZXR750J and ZXR750K. The J made its peak and rapidly fell away after about 9000 rpm.

While you might land up with better acceleration in 2nd gear at Xmph, this is no great gain if you would otherwise still be in 1st with even better acceleration.

Do you have a dyno graph and gearing for your bike? If so can you post them up?

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Coxyzxr]

[Kickstart]

Hi

Found a couple of graphs for the ZXR750J. One J1 and one J2, but quite different.

Stuck the details up here. Red line is the J1, blue line the J2 and the green line is the J2 running one tooth lower on the front (15:45 instead of 16:45).

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Coxyzxr]

[Kickstart]

Hi

Suspect that one might have been a better prepared press machine . Or just the effects of different dynos.

The graph is thrust at the back wheel vertically against speed horizontally, for each gear. The thrust is what is accelerating you.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Coxyzxr]