I thought I would start a new thread dedicated to the surging GT12 with SJT tires class.
Feel free to fire away.

Does the gate run open gearing?

Very cool.

yes. Had to so that some platforms could run.

At my club (CTSR) we also have this class. We are six racers and still grow. CTSR 1/12 GT12r class official rule : Motor Reedy 17.5 fix timing / SJT rubber tires / Gear: 72/48 / Lipo 1s roar (max 4.22v) / Weight: 780g / Body: gt12

Picture of my car: Xray X12 2022 ball diff with a Agata body

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Is there a way of reducing the rear axle width of an AE R12 5.2? Seems like the older bodies specifically for GT12 are 165mm or less. Thanks in advance

I know the body doesn't mean much in performance (some are clunkers though). Look for bodies that are wider. like the Akura or PF C8. That lets you run the car at 172 without tires sticking out.

The Seven20 is a nice body to toss into the mix too.

If you could find one!

Got my on the track yesterday for first runs. Got 3 weeks till it’s gets raced at the track in the video. I’m about 2 seconds off the previous race winner time. About a second off most of the pack.

For those of you running USGT fixed timing motors, do you have a suggestion for a starting point for gearing/rollout? We've been running open motor. Not sure where to start with the fixed timing stuff. Thanks.

In the video I posted. I was running an 80t spur. Was told need to be in lower 70s. With the 80T high 40s/low 50s is what was trying.

I use in my GT12r: spur 72t & pinion 48t.

Seems pretty close to where we are with open motor... maybe a tooth higher.

In Omaha we run the usgt motor and around 100 mm roll out