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Old 10-08-2008, 02:08 PM   #8221
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Same as the Regular JRxs or the XXXS
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Old 10-08-2008, 02:10 PM   #8222
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does anyone know the internal ratio for the car with all stock pullies. Im trying to make a chart for this car on gearchart.com

Thanks
Same as the original jrxs and xxx-s i beleive.

1.83:1
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Old 10-08-2008, 02:13 PM   #8223
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does anyone know the internal ratio for the car with all stock pullies. Im trying to make a chart for this car on gearchart.com

Thanks
Same as the XXX-s and JRXS pro 1.83, and 1.71 with 41t pulleys.
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Old 10-08-2008, 02:17 PM   #8224
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thanks I edited my post with another question by accient
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Old 10-08-2008, 02:38 PM   #8225
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thanks I edited my post with another question by accient
All your rollout of FDR for foam or rubber tires, just input your gears, tire diameter, and there you go.

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Old 10-08-2008, 02:45 PM   #8226
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does anyone know what a good gear ratio is for a 17.5 with foam tires on a high bite track. I was told to gear it around 4.2-4.6 fdr but i dont really know how to calculate that.
With foams you really need to target rollout instead of FDR since tires wear every run. Start around 48-50mm.
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Old 10-08-2008, 03:18 PM   #8227
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is fdr used more with rubber tires? What exactly does rollout do that fdr doesnt?
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Old 10-08-2008, 03:37 PM   #8228
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is fdr used more with rubber tires? What exactly does rollout do that fdr doesnt?
FDR takes into account tire circumfrance.
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Old 10-08-2008, 03:40 PM   #8229
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is fdr used more with rubber tires? What exactly does rollout do that fdr doesnt?

FDR is mostly used for Rubber tire, Roll out is for foams.

roll out give you actual distance car travle on each revolution of the motoro shaft, since foam tire wear out fast and changing diameter in every run, you do need to check your roll out to stay on same ratio or if you wat to change your gear ratio.

but if you changing rubber tire in diffrent brand and found diffrence on diameter then you have to do rollout as well.
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Old 10-08-2008, 03:46 PM   #8230
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Same as the XXX-s and JRXS pro 1.83, and 1.71 with 41t pulleys.
I thought its 1.78 with 41t on both side.
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Old 10-08-2008, 04:05 PM   #8231
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does anyone know what a good gear ratio is for a 17.5 with foam tires on a high bite track. I was told to gear it around 4.2-4.6 fdr but i dont really know how to calculate that.
That ratio is more for 13.5 not 17.5... You want to be somewhere in the 3.60 area for 17.5 with 57mm foams....
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Old 10-08-2008, 04:23 PM   #8232
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I thought its 1.78 with 41t on both side.
Yes it is 1.786 with 41's.
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Old 10-08-2008, 04:28 PM   #8233
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That ratio is more for 13.5 not 17.5... You want to be somewhere in the 3.60 area for 17.5 with 57mm foams....
what spur would you suggest to get it that low? I am running a 118 and I dont think i can get a 3.6 with it no matter the pinion, it wont fit!
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Old 10-08-2008, 04:42 PM   #8234
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Yes it is 1.786 with 41's.

then approximate value should be an 1.79 !
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Old 10-08-2008, 04:45 PM   #8235
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what spur would you suggest to get it that low? I am running a 118 and I dont think i can get a 3.6 with it no matter the pinion, it wont fit!
you need a spur adaptor made by RPS, or PRS? that company to mount a spur either either 108 or 104
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