Inner mold for ZH Racing rear tires, commonly used in Hang-On Racers, is the "C (Expert)" type. Made with a 3D printer. The product in the first photo is what will be sent. (The exploded view in the third photo uses the B type (red).) ※The screws have changed from silver to black in the photo. Measured for ZH rear tires, it's slightly larger than the tire's inner diameter. Compared to B, it has a higher center profile, making it easier to lean into turns. ※To put it negatively, it means "less stable." If you've "tried the B inner" and want a bit more movement, please try this C. Also, due to the slightly larger outer circumference, some modification is required for the kit's original swing arm and part of the lower section of the optional oil damper. See photo 5. Weight is "18.0g for the inner only" and about "64g with tire and wheel." The dimensions of the wheel and inner are appropriate, so "tires can be set without adhesive" (see photo 4). (If you are using a high-power motor and feel uneasy, please use adhesive.) After a year of making and testing, changing the shape and testing again, I've created something that roughly meets the required conditions. I hope you will give it a try. Shipping will be via "regular mail." Instant purchase is OK without questions. By the way, I am the aforementioned "Chevron Models." Made with a 3D printer (0.1mm layer thickness for precision) and assembled and finished by hand, so I can't make many. Therefore, it cannot be distributed through wholesalers or retailers like our other products. (The price is set without the markup for direct sales.) Please understand. Thank you. Type...Radio Control