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BrianG · 10.14.2008, 11:33 AM

Well, the tires on my GTP are closer to 4.25", which will drop the speed to around 35mph. You can use a 14T pinion to get back up to ~37mph. I don't think you'll have any problems with a 15T (~40mph) or maybe even a 16T pinion (~42mph), if the vehicle is kept light. But, a 14T pinion is a good place to start.

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BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	10.14.2008, 11:33 AM Well, the tires on my GTP are closer to 4.25", which will drop the speed to around 35mph. You can use a 14T pinion to get back up to ~37mph. I don't think you'll have any problems with a 15T (~40mph) or maybe even a 16T pinion (~42mph), if the vehicle is kept light. But, a 14T pinion is a good place to start.