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Recalls, how-to's, tips, etc Recalls, service bulletins, how-to's, tips, and tricks.

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Old 06-21-2006, 12:37 PM
Lou Lou is offline
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I just put 20" haulers on my ltr, should i change my sprocket? Front...up a tooth will do what? Down a tooth will do what? Back...up a tooth will do what? Down a tooth will do what? Thanks!
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Old 06-21-2006, 01:18 PM
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To compensate for larger tires on the rear (20's), you should probably drop a tooth off of your front sprocket.

A smaller front sprocket adjusts the gearing in the same direction as a larger rear sprocket.

Front sprocket adjustments have more of an effect.
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Old 06-21-2006, 01:31 PM
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Lou, you can calculate the gear ratios...

Factory gearing is 14T front sprocket and 36T rear: 36/14=2.57 (any number bigger is geared lower and any number smaller is geared higher)

If you drop a tooth on the front: 36/13=2.77 (dropping teeth on the front lowers gear ratio)
If you raise a tooth on the back: 37/14=2.64 (adding teeth on the back lowers gear ratio)

If you add a tooth on the front: 36/15=2.4 (adding teeth on the front raises the gear ratio)
If you drop a tooth on the rear: 35/14=2.5 (dropping teeth on the rar raises the gear ratio)

It is commonly accepted that one tooth change on the front sprocket equals three on the rear sprocket...let's test it out:
If you drop a tooth on the front: 36/13=2.77
If you add 3 teeth to the rear: 39/14=2.79

Pretty close...

Hmm, now, how did changing your tires affect everything? Taller tires raise your gear ratio and shorter tires lower it...
Here is a sample calculator for your tire changes...
Find new gear ratio with new tire size calc
Your old tires were 18" tall, your new tires are 20" tall, your factory gear ratio is 2.57...according to the calculator you will need a gear ratio of 2.86 to have the same ratio with your new tires as the bike had stock...which would be a 13T front and a 37T rear...37/13=2.85.

Does this make sense?

Edit:
I wanted to add this to the thread:
I do not know how many of you have seen this but it is a very nice calculator built by 86atc250r from .org...Gabe is his name. Also, FYI, read the notes on the bottom of the calc...you can change tire height to roll out instead, etc.

He has the LTR in their now...

http://www.xcracing.com/gabe/quad_calc.exe


-Rob

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RockinHorseWeb...Check It Out!
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Old 06-21-2006, 01:41 PM
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Very well said by OKTRX450R! That explaination kicked the crap out of mine.
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Old 06-21-2006, 02:22 PM
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WOW Thats kicks butt!!! I have always wondered how to figure that!!! Thanks so much for the info OKTRX450R! I will be printing this off!!


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Old 06-21-2006, 03:21 PM
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SWEEEEET! That deserves a sticky. Great info there. Thanks
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Old 06-21-2006, 03:34 PM
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So for dune riding with 20" tires what gearing or gear ratio is reccommended? example :
Drags... what ratio ?
Hill climbs... what ratio?
Avg. riding, Jumps, and bowl carving... what ratio ?
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Old 06-21-2006, 03:42 PM
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Quote:
So for dune riding with 20" tires what gearing or gear ratio is reccommended? example :
Drags... what ratio ?
Hill climbs... what ratio?
Avg. riding, Jumps, and bowl carving... what ratio ?
[/b]
Just drop the front to a 13t and call it a day. Well thats what i did.



<div align='center'>LT-R450K6 E33 |white | shaved | cbrm | full rs-5 | modified air box | 13t front sproket | etc...
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Old 06-21-2006, 06:40 PM
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Very well said by OKTRX450R! That explaination kicked the crap out of mine.
[/b]

Especially since he spelled sprocket right and you didn't..........................
!!!!!!


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Old 06-21-2006, 10:26 PM
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So much for my cowbell theory... :P


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