I had the same issue with on the SR… it was touching the gearbox. I kept tinkering to see what I did wrong in the installation. No success so I ended up cutting away a bit of the plastic to make it clear. So it’s not limited to the normal TT suspension.

Will be running the Raikiri GT body on my SRX for my club.

Bro honestly that's the cleanest Raikiri body I have seen. Super pretty.

Sorry not reamer. Thread former from Tamiya.

Looks like someone has been paying attention to the posts on here ...LOL

TCS National Finals is running the spec 17.5 HobbyWing Justock in GT ProSpec class. Cars will only use one of the two Porsche 992 bodies (51705 or 51752), car must be configured with short 251mm wheelbase and the HobbyWing Justock G3S ESC will have to have the RPM limit set (TBD). Rest of GT ProSpec rules apply. This eliminates the few folks that have the lightweight Mustang or Mercedes bodies and the car will have the motor to make better use of the limited gearing in the TT-02.

I don’t get why change the motor from 21.5 to 17.5 and then set a limited RPM.

To increase peak torque without increasing top speed. Normally decreasing the electrical resistance of the motor by having shorter windings would increase both torque and top speed, at the expense of greater heat buildup and lower power efficiency when accelerating.

Probably as simple as the next level of specifying the class.

The GT ProSpec class used to have no weight rule and no motor timing specs so most fast guys had their cars down to low 1200's in grams and the Reedy Sonic motors cranked up to 56-58* of timing for a KV rating of around 2650-2750. Cars were fast and fun to drive but the lack of rules just pushed guys to press harder. One day you're faster and next week they come back with a higher timed motor and now they're faster. In a class with such a high spec FDR its all a motor game.

With the new timing rules in effect (46.0* per HobbyWing) the 21.5 motors are turning a much lower KV (maybe 2200-2300), add the minimum 1400g weight rule and these cars are now sluggish and slow. By going to the 17.5 you get the KV back up but then limiting the RPMs via the ESC gives Tamiya the control to set the pace of these cars based on the event/track size. ETS series in Europe has shown great success now running the HobbyWing platforms (Justock Motor/ESCs in lower classes, and higher end 100a ESC and G4 motors in the expert stock classes) and setting different RPM caps based on chassis (Fwd, TC, F1). With the RPM limit, its very easy to tech and completely levels the playing field top speed wise.

Fred has clarified that the 17.5 is just for nationals and the 21.5 is still the standard motor for 2026 regionals. The choice of 17.5 for nats is due to the long straight at SCOR.

The 21.5 is too slow for Jackson. Big Dog is huge too. Should be 17.5 on large outdoor tracks and 21.5 on indoor carpet. With the weight and motor timing spec at 180 Raceway earlier this year the 21.5 was slower than what we were used too but it was still fun as the track is only 80 x 34 but super high bite on the black CRC carpet.

Does the class need more torque without more speed?

It's the same problem with "spec" racing in that while trying to keep competition close and/or costs low, the unintended consequence is it becomes a battle over something else.

I think the best thing would be to open up TT02 to ALL Tamiya only upgrades, with the caveat being that you are only allowed to pick a maximum of 4-5 "upgrades" above stock, with each upgrade being a Tamiya part number. Have a spec tire and have a brushed (23T Sport or Torque Tuned) and brushless (amy 21.5 fixed timing) motor option. Bearings and pinion/spur combos should be free, but NO trimming of any parts should be allowed. Simple.

If I were running brushless, I would have pick the speed tuned gear set (54500) to take advantage of the brushless setup (upgrade 1), 54752 Steering kit(upgrade 2), which leaves 3 more items to upgrade to suit whatever my driving style or track may be.

Want that additional toe-in in the rear? That's one upgrade point. Want front universals so you can have more steering throw without the dogbones popping out? That's one upgrade point. Want a heatsink so you can gear higher for a more ideal FDR? That's another upgrade point. Want the CVA shocks to balance out the car and lower the ride height? Upgrade point.

With a fixed amount of upgrade points, people are going to have to pick whether they want speed, durability, driveablity, etc...

21.5 with the max allowed gearing was painfully slow at the TCS in Vegas. During practice, the Euro trucks would pass me on the straights.

At rc madness the club class is tt02 with torque tuned motor. When practicing with my tcs prospec against club cars with torque tuned motor it is significantly slower.

I think moving to 17.5 fixed timing and fixed gearing is better option hopefully they update the rules it just a bit to slow as is.....or go back to torque tuned motors but that is another can of worms......

Jamie