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Old 10-10-2006, 11:58 AM   #16
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Originally Posted by "Spanky
do you have the formula for rollout? Also what units to use for the measurments. I am confused because what make for a different gear ratio if you have a 72 tooth spur and its 64 or 48 pitch (doesn't it still have the same # of teeth?)
the rollout depends n the final drive ratio of the gearing for a particular car. if you compare gearing charts for a car with similar sized spur gears (dia. not teeth) you'll see that the change in FDR per tooth on the spur/pinion is smaller with 64 pitch than it is with 48 pitch... basically it comes down to the fact that 64 pitch has smaller teeth which translates to the smaller changes.
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Old 10-10-2006, 12:06 PM   #17
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Default roll out

RO = D * 3.14159 * S / P

where

RO is rollout (inches or cm)
D is rear wheel diameter (inches or cm)
S is number of spur gear teeth (pitch makes no difference)
P is number of pinion gear teeth
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Old 10-10-2006, 12:18 PM   #18
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Default 64 vs 48 pitch

using 64 pitch provides you with more gearing options vs 48 pitch for a given diameter of spur gear.

let's say the biggest gear that will fit your car is 128 tooth in a 64 pitch, that would equate to a 96 tooth spur in 48 pitch, for example; therefore, for allowing for finer adjustment in gear ratios for any particular pinion.
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Old 10-11-2006, 11:48 AM   #19
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thank you!
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Old 10-11-2006, 11:40 PM   #20
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Quote:
Originally Posted by TimPotter
I have had problems with PRS pinions. I have had 2 or 3 of them that did not fit on the output shaft. The ti racing pinions have been the best for me.

Contact PRS.. i had bought 3 of there spur gears, and they were to wide.. they sent me 3 replacements for the bad ones.. there customer service is awesome..

tho your gears did not fit, remove some of the coating inside the hoes.. alot of mine are tight.. But i like that because it keep the pinion super true on the sfaft.. no slop wobble..
I dont run there spurs tho.. i refuse to pay 6.50 for a spur that can pick upa stone and be junk in one run.. I prefer the standard kimbrough's.. also even tho a spur looks good be carefull for slight rounding or spreading of the teeth.. if you notice the car gets a little louder its time to replace the gear.. this happens with all spurs..
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Old 10-11-2006, 11:54 PM   #21
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Xenon spurs are the shit.
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Old 10-12-2006, 07:54 AM   #22
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Has anyone had the chance to use the Kimborough plastic pinions? I'd like to hear a review on these.
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Old 10-12-2006, 09:54 AM   #23
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I've been using them for years- Touring and 1/12th.I've had no problems you do the mesh a little tigher than the metal gears. I won a Masters Roar Nationals 1/12th championship in 2003 using these gears in 1/12th. Presently running the Novak Brushless Stock 13.5 for several months in an RDX , again with no problems.
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Old 10-12-2006, 04:51 PM   #24
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only one name when it comes to spurs and pinnions people!


prs
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Old 10-12-2006, 08:21 PM   #25
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RW spurs and TiR Ultra pinions!
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