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xStock Class Regulations 2026 7-1-2026

Stock Class Regulations <- click here

Modification History

July 1, 2026

Initial Version Posted

July 10, 2026

Corrected FAQ on CFM Chassis/Pinion Gear combination.  Added FAQs.  

 

FAQs

Questions Answers 
Which pinion gear is permitted for the Carbon Reinforced Super FM Chassis? Allowed Pinion Gears are Purple, Metal, White and Black (Carbon).  
Can I combine special gear ratios, such as pairing Gray Counter Gear with Yellow Spur Gear or Gray Spur Gear with Light Blue Counter Gear? No, that is not allowed.
Is it allowed to use lock nuts for attaching 15412: Carbon Reinforced Rear Double Roller Stay (3 Attachment Points) to the chassis? No, that is not allowed.
Can batteries be wrapped? Yes, use clear plastic wrap so the label remains visible. Batteries with colored wrap, missing, or
damaged labels are not permitted.
Regarding restrictions on usable carbon plates: There are various plates, such as past TMAC limited edition plates and TKC (Korea limited edition) plates. Are there any restrictions on the types of plates that can be used? The various limited edition plates such as those from Tamiya Korea (TKC), Tamiya HK, TMAC, Japan Cup, are allowed.  Tamiya released plates are all accepted.