Front and rear plates on an FM-A: how the B-MAX stack fits together

In B-MAX you cannot cut a plate or drill a new hole. Every roller angle, brake pad and damper position has to come from bolting existing Tamiya plates together through the holes Tamiya already drilled.

On our FM-A Setup Book car — built on the same FM-A platform as Mach Frame (18714) and Brocken Gigant Premium (19452) — the front and rear roller stays use the same core pair stacked together: 95433 HG Carbon Front Stay (1.5 mm, full-cowl type) on top of 15472 FRP Wide Front Plate (full-cowl type).

Brocken Gigant15 versionsCar page › Mach Frame8 versionsCar page › 15472FRP Wide Front Plate for Fully Cowled Mini 4WDPart page › 95433HG Carbon Front Stay (1.5mm) full-cowl typePart page ›

The front stack: roller stay, base plate and front brake

At the front, one 1.5 mm plate flexes when the car noses into a jump landing. Stacking the carbon 95433 (¥1,034) with its matching FRP twin 15472 (¥286 / RM11) gives a 3 mm roller stay using standard 9, 13 and 19 mm holes without cutting the body.

Underneath that pair sit four supporting plates:

• Front base plate, 15243: the Super X FRP Rear Roller Stay (¥242 / RM11), turned around and bolted into the lowest front holes of the FM-A bumper under the 15472 + 95433 stack.
• Reinforcing strip, 15193: the classic FRP Reinforcing Plate Set ("popsicle stick", ¥220 / RM8.10) tying the front group together.
• Two HG carbon multi plates, 15495: two pieces of 15495 HG Carbon Multi Reinforcing Plate (1.5 mm, ¥1,210 / RM33) sit on the front underside — one in the front stay group and one carrying the 15512 mild blue front brake sponge.

The rear stack: upper roller stay, lower stay and brake plate

At the rear, the car needs two roller heights for the 13 mm ringless aluminium rollers (15437) plus a flat tail behind the wheels for the rear brake sponge and cylinder mass dampers:

• Rear upper stay, 95433 + 15472: the same full-cowl carbon and FRP pair stacked together at the top.
• Rear lower stay, 15242: a Super X FRP Multi Reinforcing Plate (RM8.10) mounted lower down to keep the bottom rollers aligned.
• Rear brake stay, 15518: the FRP Rear Brake Stay Set (¥418 / RM17), which gives a wide flat surface behind the rear wheels for the 15492 white brake sponge (wrapped in 15463 blue multipurpose tape) and the two rear cylinder dampers.

The B-MAX ruling

B-MAX allows FRP and carbon plates to be stacked and used outside their named position (for example, bolting a front full-cowl stay at the rear, or a Super X rear stay under the front bumper), provided every part is a genuine Tamiya item, no outline is cut or sanded, and every countersunk hole starts from an existing factory hole.

This is one section of the 33-page FM-A Setup Book. The book shows every plate layer by layer with custom vector drawings, screw lengths, spacer estimates and full item numbers.

In this post

15495HG Carbon Multi Reinforcing Plate (1.5mm)Part page ›15193FRP Reinforcing Plate SetPart page ›15242Super X FRP Multi Reinforcing PlatePart page ›15243Super X FRP Rear Roller StayPart page ›15518FRP Rear Brake Stay SetPart page ›