The RCEcho website has a section where you can download the manual. It'll have the part number for the kit tyres in there.

That's an odd sort of place to point them at. RCEcho is a generic toy/hobby sale website.

Here's the manual from Tamiya.

https://www.tamiyausa.com/shop/110-4...chassis-kit-2/ That page has a "download manual" link. The tires included are the 51049 tires.

Thank you.

I saw the wheels part number, but did not see the tires on first pass.

If you are racing at Larry's or Bay City there using a reedy 21.5 with locked timing. If your not racing at either one it's up to you what size you want.

Hobbywing. We can't decide on a motor for you. It's a TT02, so..... maybe a 17.5? Remember faster motors mean more broken parts. Honestly, if your'e not racing, you could also go the sensorless route, in which case you need to poke about some other forums. The sensorless crew is kinda light here.

The Tamiya USA and Tamiya JPN websites are hit and miss in terms of downloads in my experience.

RCEcho has yet to fail me.

https://rcecho.com/TAMIYA_RC_Model_M..._Download.html

I would get the hobbywing, and get the program card.

17.5 in TT-02
 

If the car is "only" a basher and you don't have to be d'accord with some racing rules maybe the 17.5 turn combo is getting boring quickly unless you don't optimize final drive ratio things. Without 2nd souce gadgets you cannot achieve lower FDR than 5.74, which is not really that fast...:o
To get some decent speed from a 17.5, you have to get FDR of 4.0 or even lower. To do so, the Yeah Racing motor mount ist needed, this Item has no fixed motor mounting points like the Tamiya part and allows you, in combination with 64dp gears, to get nice gearing for a 17.5 rocket.
You can Check "thercracer.com" for more information about proper TT-02 gearing and additional tons of TT-02 related articles, Tricks and such stuff.
My son (6 years old) is running a 21.5T Hobbywing and SkyRc Toro TS50 ESC Combo on 2S LiPo with his TT-02, FDR is 3.9
This works great for the young man and he has loads of fun to race the local supermarket parking lots! :D

Not sure the number. Just ebay hobbywing program card. It's about $12.

If you aren't going to change the stock gears (22T/70T if i'm not wrong), then a 17.5T brushless will have a lower top speed than a 540 sport tuned brushed motor because a 17.5T brushless turns to ~17000rpm and the brushed motor turns to ~21000rpm. It will however accelerate like a rocket on the standard gearing since it makes 50-100% more power than the brushed motor. You could run 3S for higher top speed if the motor/esc supports it, but you could also just run a 13.5t or 10.5t motor on 2S which would achieve the same thing. It's a lot easier to find hard case 2S batteries that fit the TT02 battery bay.

Ideally, get the 17.5t on 2S and change the gearing by getting the high speed gear set. Toss the supplied gears and buy aftermarket 64dp or 48dp gears. FDR somewhere between 4 and 6 should be good for bashing with a 17.5. Lower than about 4.6FDR will require cutting a hole in the gear cover so the larger pinion clears it. You will want to seal over the hole so dirt doesn't get in when bashing.