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Working out Gear ratio

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binge
Emo Kiddy



Joined: 02 Jul 2004
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PostPosted: 20:34 - 17 Jun 2009    Post subject: Working out Gear ratio Reply with quote
Ideally one for Keith...

Just curious really as to how different the gearing is going to be on the TZR engine in my pit bike, Compared to how it was in the TZR.



Standard TZR set up:

Front Sprocket - 16t
Rear sprocket - 45t
Rear wheel - 18"


Pit bike setup:

Front Sprocket - 17t
Rear sprocket - 35t
Rear wheel - 12"




Ben
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 20:40 - 17 Jun 2009    Post subject: Reply with quote
Hi

Very roughly 9% lower. However the tyre profiles probably will make a difference.

(17/16) * (45/35) * (12/18).

All the best

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



Joined: 02 Jul 2004
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PostPosted: 21:35 - 17 Jun 2009    Post subject: Reply with quote
Lower being?

Taller gearing or shorter gearing on the pit bike?
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 21:37 - 17 Jun 2009    Post subject: Reply with quote
Hi

Lower = shorter.

Top speed could still be a bit worrying on that!

All the best

Keith
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binge
Emo Kiddy



Joined: 02 Jul 2004
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PostPosted: 21:43 - 17 Jun 2009    Post subject: Reply with quote
Oh thats good, As long as it wont make the gearing taller than the TZR. I need to keep it torquy because I wont be running a VPVS.

And yes, I'm looking forward to a top speed run.




Ben
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 21:46 - 17 Jun 2009    Post subject: Reply with quote
Hi

Years ago Charlotte had a TZR125 which went round most of the time with the power valve clamped open. Went OK at low revs, certainly not as bad as an RS125 with the power valve stuck open.

All the best

Keith
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binge
Emo Kiddy



Joined: 02 Jul 2004
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PostPosted: 22:07 - 17 Jun 2009    Post subject: Reply with quote
I've heard they are okay just to lock open.

I think I'll try it set differently and see how I get on.


Cheers again Keith.





Ben
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DaveH
World Chat Champion



Joined: 03 Feb 2006
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PostPosted: 05:39 - 18 Jun 2009    Post subject: Reply with quote
This is quite a cool site Thumbs Up

https://www.gearingcommander.com/
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https://www.timhastingsracing.co.uk/

ZX7R & ER6F
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tsmith
Traffic Copper



Joined: 15 Apr 2005
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PostPosted: 06:44 - 18 Jun 2009    Post subject: Reply with quote
DaveHogg wrote:
This is quite a cool site Thumbs Up

https://www.gearingcommander.com/



Very Happy According to that site if I fit a 130/80-17 rear tyre and a 17 tooth gearbox sprocket the top speed of my GPZ500s jumps from 120mph to 133mph
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 09:27 - 18 Jun 2009    Post subject: Reply with quote
Hi

If you want some idea of what the real effect of changing the gearing is then get a dyno graph for you bike and put the details in here:-

https://www.bikegraph.co.uk/TorqueGraphs.php

All the best

Keith
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Old Thread Alert!

The last post was made 16 years, 27 days ago. Instead of replying here, would creating a new thread be more useful?
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