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Old 03-23-2007, 12:55 PM   #1
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Default Pinions and Spurs and 13.5's oh my!

These new 13.5s really require you to gear up. Im finding it difficult to find spur gears small enough and pinion gears big enough to get the proper rollout. On a cyclone with an internal ratio of 2.4375 if I run a 88T spur and 48T pinion then I get a rollout of 38mm on 54mm tires. Ive ran up to a 40mm rollout.

Are these new motors going to force cars to smaller internal ratios and room for the smaller spurs and bigger pinions? My largest pinion would hit the motor screws on my TA05.
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Old 03-23-2007, 01:53 PM   #2
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This might be the return of full size foam tires! Think about it - being able to run an overly priced product right out of the box, without requiring time and a $200+ machine to fix them!
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Old 03-23-2007, 02:30 PM   #3
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i got to say it was a little difficult to find a spur small enough for my t2 with internal ratio of 1.7 , stock spur 64p is 116 , when down to 100 with a 35 starting pinion with 57mm tires ouch///////// with a roll out of 36.87
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Old 03-23-2007, 03:24 PM   #4
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tim how much are you having to go up in mod.. or maybe if kevin see sthis he can tell me...

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Old 03-23-2007, 03:53 PM   #5
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Do your touring cars use the same spurs as pan cars? If so, there are 5 spurs to choose from smaller than 88T.
Robinson Racing makes 78T, 81T, 85T spurs.
PRS soon will be releasing a 80T and 84T spurs.
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Old 03-23-2007, 04:02 PM   #6
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With the XRAY they have a Triple screw setup. Xenon sells a Center Spur Gear adaptor that will work with "regular" gears as well.

PRS has any size pinion you can imagine. They look like spur gears for the motor.....
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Old 03-23-2007, 05:10 PM   #7
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Quote:
Originally Posted by or8ital
Are these new motors going to force cars to smaller internal ratios and room for the smaller spurs and bigger pinions? My largest pinion would hit the motor screws on my TA05.
From the RDX Phi specs:
"All pulleys are optionally available in several sizes for optimised internal ratio on long and short tracks with either brushed or brushless motors."

The manufacturers are catching on.
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Old 03-23-2007, 05:33 PM   #8
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Quote:
Originally Posted by James35
Do your touring cars use the same spurs as pan cars? If so, there are 5 spurs to choose from smaller than 88T.
Robinson Racing makes 78T, 81T, 85T spurs.
PRS soon will be releasing a 80T and 84T spurs.
James35, I tried the 3 distributors for RRP and none carry smaller then the 88T. Well as of about 2 weeks ago they didnt.
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Old 03-23-2007, 05:34 PM   #9
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Quote:
Originally Posted by smitty2802
tim how much are you having to go up in mod.. or maybe if kevin see sthis he can tell me...

-DC-
I havent been brave enough to try Mod yet.
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Old 03-23-2007, 05:43 PM   #10
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Quote:
Originally Posted by or8ital
James35, I tried the 3 distributors for RRP and none carry smaller then the 88T. Well as of about 2 weeks ago they didnt.
Click on my hyperlinks. All 3 are in stock at Horizon.
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Old 03-23-2007, 05:47 PM   #11
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Quote:
Originally Posted by James35
Click on my hyperlinks. All 3 are in stock at Horizon.
Yeah just found it. Looks like they have been added. Thanks!
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Old 03-24-2007, 03:49 AM   #12
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Kimbrough also has spurs.Since I don't use foams and only race outdoors (rubber)my RDX is fine with the gear ratio I'm using.33-34 with the current spur. I've got a smaller Kimbrough spur to install if I needed it (78).Oh yes I also use the Kimbough pinions.
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Old 03-24-2007, 05:00 AM   #13
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I run rubber tire stock with my jrxs, and was using a CO-27 with a fdr of about 7.50. I wound up so far with 13.5 at a fdr of 6.16. with loads of punch out of the corners, and a temp of only 100-110. this week I am going to try it with the sintered rotor with the same ratio and see how much difference I have. I race on a tight parking lot course.
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Old 03-24-2007, 09:06 AM   #14
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Quote:
Originally Posted by losi nut
I run rubber tire stock with my jrxs, and was using a CO-27 with a fdr of about 7.50. I wound up so far with 13.5 at a fdr of 6.16. with loads of punch out of the corners, and a temp of only 100-110. this week I am going to try it with the sintered rotor with the same ratio and see how much difference I have. I race on a tight parking lot course.

With the sintered rotor on a tight carpet track I started 5.50 FDR and ended up at 5.10 FDR with temp. at 100-110F.
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Old 03-24-2007, 09:39 PM   #15
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Quote:
Originally Posted by BullFrog
Kimbrough also has spurs.Since I don't use foams and only race outdoors (rubber)my RDX is fine with the gear ratio I'm using.33-34 with the current spur. I've got a smaller Kimbrough spur to install if I needed it (78).Oh yes I also use the Kimbough pinions.
No, the smallest 64 pitch spur Kimbrough makes is an 88T.
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