Tamiya Mach Frame 18714: FM-A Kit Guide
Mach Frame (item 18714) is a distinctive FM-A assembly kit because its body is deliberately built from several visible pieces. Tamiya says the core shell joins three separate frame components, drawing on high-speed motorcycles and jets. The design received a Merit Award in Tamiya's 2018 Mini 4WD Design Contest. That is different from Razorback's Top Award, and neither award says how a kit will run on your track. For a builder who enjoys seeing how a design fits together, Mach Frame gives the body assembly an unusually prominent role.
A multipart body, not just a different sticker sheet
Mini 4WD REV Series No.14 does not rely on one large smooth cowling for its character. Tamiya describes a main body and three frame sections that link into the final shape. Lay those pieces out before pressing them together so you can understand which surface remains visible. Test-fit the frames without stickers first, then remove them only as the kit instructions require for decoration. The metallic sticker sheet adds the finish, but the three-dimensional frame is what distinguishes the car from a standard FM-A shell. Avoid forcing a frame piece if it sits crooked; inspect the tabs and orientation shown in the box diagrams.
The stock assembled dimensions are 156 × 97 × 36 mm. Those are Tamiya's product specifications, not a promise about a modified car. The 36 mm height is notably lower than Razorback's published 46 mm, though the two kits have the same published length and width. If you plan to add stays or rollers later, compare the actual body clearance at each mounting point. Height alone does not tell you which add-on fits; the side profile and frame edges also matter. The body selection guide helps explain why shell shape deserves its own check.
The stock FM-A hardware under the frame
Tamiya molds the front-motor FM-A chassis in metallic-grey ABS and the low-friction A parts in black. White A-spoke wheels wear super-hard low-profile tires. The motor is included, as are 3.5:1 gears; supply two AA/R6 cells separately. The front motor and underside access are standard FM-A traits, so you can service the drivetrain without treating the unusual body as an entirely new mechanical platform. In other words, learn the chassis from the normal FM-A instructions while giving the body frames the extra assembly attention they need.
Start with the stock motor, gears, wheels and tires. Confirm each wheel turns freely and no frame piece rubs before your first run. If the car makes an unexpected sound, inspect the drivetrain with the power off instead of pressing down on the frame to make the noise disappear. The FM-A setup guide covers motor position, braking and adjustment once the kit is assembled correctly. Mach Frame's included super-hard tires are a product fact, not a guarantee of better grip or control on every track surface.
Choose the body before choosing upgrades
The most satisfying reason to buy this kit is the linked body-and-frame look. If you replace the shell immediately, you lose its main distinction. For an early upgrade, keep the body attached while test-fitting the part, inspect contact around each frame piece, and use the chassis-specific compatibility guidance supplied with the part. Do not assume a component pictured on another FM-A car clears Mach Frame's decorative structure. If you race in a class with body rules, consult the event's current sheet before trimming any of these pieces; an attractive clearance cut may be impermissible in that class.
Mach Frame also makes an interesting side-by-side build with Razorback. One is a multipart motorcycle/jet concept with white wheels and 3.5:1 gears; the other is a gunmetal boar/hot-rod concept with dark-silver wheels and 4.2:1 gears. Both are full FM-A assembly kits. The contest results describe the designers' recognition, while the box specifications tell you what you will actually build.
Who is Mach Frame for?
Pick item 18714 if you enjoy a visually structured shell, want the included super-hard low-profile tires, and prefer its lower stock body profile. Pick another FM-A body if you want a different silhouette; you can still learn the same front-motor platform. Check the Mach Frame store listing for the exact item, rather than buying by chassis name alone.
Frequently asked questions
Are the frame pieces separate parts?
Yes. Tamiya describes three frame components in addition to the main body.
Which motor and tires are included?
Tamiya states that a motor and super-hard low-profile tires are included; its page does not name a special tuned motor.
Does the Merit Award mean it is faster than Razorback?
No. Merit Award and Top Award refer to the 2018 design contest, not measured track performance.
Source checked 26 September 2026: Tamiya item 18714. Published dimensions and kit parts refer to the stock assembly.