Favorite Sproket Combo for Grattan?

Noodles · 06-14-2006, 3:39 PM

I'm turing the 929 into a track bike and was thinking about changing the sproket combo. I currently use 16/46 and was wondering what the Grattanaholics out there feel is the best combo for Grattan. I'm sure it will come down to personal opinion, but what do "you" think?

abtech · 06-14-2006, 3:41 PM

Quote:

Originally Posted by Noodles

I'm turing the 929 into a track bike and was thinking about changing the sproket combo. I currently use 16/46 and was wondering what the Grattanaholics out there feel is the best combo for Grattan. I'm sure it will come down to personal opinion, but what do "you" think?

For the 929, I would go with 15/44. That way you can use the entire gearbox and all of the corners fall into place.

Noodles · 06-14-2006, 3:49 PM

Quote:

Originally Posted by abtech

For the 929, I would go with 15/44. That way you can use the entire gearbox and all of the corners fall into place.

That is exatcly what I'm looking for. Any issue with or difference between using 15/44 Vs. 16/47

abtech · 06-14-2006, 4:03 PM

Quote:

Originally Posted by Noodles

That is exatcly what I'm looking for. Any issue with or difference between using 15/44 Vs. 16/47

More chain = more weight, possibly longer wheelbase depending on how it all aligns . . .

sheepofblue · 06-14-2006, 4:22 PM

Quote:

Originally Posted by abtech

More chain = more weight, possibly longer wheelbase depending on how it all aligns . . .

Even worse the chain is running further from the axle on a 47 which increases the effective mass.

gt702 · 06-14-2006, 4:31 PM

Quote:

Originally Posted by sheepofblue

Even worse the chain is running further from the axle on a 47 which increases the effective mass.

Actually it's the effective rotational moment of inertia, but we know what you mean

That was my thought too.

I had heard something years ago about the torque applied to the swingarm with different gear diameters, and that the diameters should be chosen to have the right loads applied to the tires, but I don't remember the details. Something about squat or anti-squat properties.

I've stuck near stock so maybe it doesn't matter.

sheepofblue · 06-14-2006, 4:51 PM

Quote:

Originally Posted by gt702

Actually it's the effective rotational moment of inertia, but we know what you mean

That was my thought too.

I had heard something years ago about the torque applied to the swingarm with different gear diameters, and that the diameters should be chosen to have the right loads applied to the tires, but I don't remember the details. Something about squat or anti-squat properties.

I've stuck near stock so maybe it doesn't matter.

sheep physics is ... different

Nickelii · 07-05-2006, 6:54 PM

I ran 16/46 while we were there and it worked really well. I was just clicking sixth before I had to get on the brakes for T1

Red Rider · 07-05-2006, 8:11 PM

Quote:

Originally Posted by Nickelii

I ran 16/46 while we were there and it worked really well. I was just clicking sixth before I had to get on the brakes for T1

...and my stock gearing was catchin' yo' ass!

abtech · 07-05-2006, 8:53 PM

Quote:

Originally Posted by Nickelii

I ran 16/46 while we were there and it worked really well. I was just clicking sixth before I had to get on the brakes for T1

I always go for the setup that has me just about at the limiter in sixth at the end of the straight. You certainly won't need any more, but can always use the lower ratios through the tighter stuff.

Baketech · 07-05-2006, 8:55 PM

My 929 that you ran in the pillion session has 15/45...

luvtolean · 07-05-2006, 8:58 PM

Quote:

Originally Posted by Baketech

My 929 that you ran in the pillion session has 15/45...

That's what I ran there the first time if I remember correctly.

Now I've got 14/38 or something like that...

Nickelii · 07-05-2006, 9:02 PM

Quote:

Originally Posted by Red Rider

...and my stock gearing was catchin' yo' ass!

I never said I was fast........

I was having some brake problems as well

For my buddy Pete

phobiaphobe · 07-05-2006, 9:04 PM

15/43 on my 1000rr had me hitting the top of 5th at the end of the straight... but if I could ride worth a **** I'd probably be well into 6th.

Red Rider · 07-05-2006, 9:09 PM

Quote:

Originally Posted by Nickelii

I never said I was fast........

I was having some brake problems as well

For my buddy Pete

Good pic! Shows how much of a gap I had to make up to catch you...all the while TB was waiting for his chance!

gt702 · 07-06-2006, 7:41 AM

Quote:

Originally Posted by abtech

I always go for the setup that has me just about at the limiter in sixth at the end of the straight. You certainly won't need any more, but can always use the lower ratios through the tighter stuff.

Besides, after paying for 6 gears, you should use them or you've wasted your money

.... I seem to remember hearing that somewhere before