Mini-Z Body Compatibility: MR-03, MR-04, MA-020

Buying a Mini-Z body without checking compatibility is how you end up with a gorgeous licensed shell that won’t fit your chassis. This guide covers the 3 things that matter most:

• Wheelbase (mm)
• Body width
• Wheel offset (mm)

If you want the fast answer: match the wheelbase first, then use offset to get the wheels centered in the arches. Still deciding which chassis to buy? The MR-03 vs MR-04 comparison covers the platform differences that matter before you pick a body.

Wheelbase (Compatibility Chart)

Wheelbase is the distance between front and rear axles. Mini‑Z bodies are designed around a specific wheelbase setting, so this is the first thing to match.

Wheelbase	Common body types
90mm	short sports cars
94mm	“standard” — most common
98mm	sedans, GT cars
102mm	large sedans / long shells

Tip: if a body lists multiple wheelbases, it usually means the chassis can be configured to match (different motor mounts / T-plates / rear pod positions depending on platform).

Body Width and Wheel Offset

Body width is the overall width of the shell. Wheel offset is how far the wheel mounting face moves the wheel inboard/outboard relative to the hub.

If compatibility feels confusing, it’s usually offset.

• Too little offset → wheels sit tucked in, don’t fill the arches.
• Too much offset → tires rub the body, steering binds, or the shell won’t sit down.

Most bodies specify a required offset like +1.0 / +2.0 / +2.5 / +3.0 (front and rear can differ). Match the body’s spec with your wheels. For a full breakdown of how offset numbers work and affect handling, see the Wheel Offset and Width Guide.

Practical rule: wheelbase makes it fit; offset makes it look right.

MR-03 vs MA-020 (RWD vs AWD)

• MR‑03 (RWD): the default for most “race” setups; huge body support. See the MR-03 Platform Guide for full setup and body selection details.
• MA‑020 (AWD): shares many bodies with MR‑03, but the drivetrain/steering layout can make some shells a tighter fit. See the MA-020 Platform Guide for AWD-specific body notes.

In general, if the body is listed for both platforms, you’re good — just make sure you’re matching the wheelbase and offset. The MR-04 Platform Guide notes which body shells suit its narrower track width specifically.

Body Choice and Running Surface

Body selection does not happen in isolation from surface. On high-grip RCP foam, wider bodies with more aggressive offset increase the risk of traction rolling — where the car tips over mid-corner because the outside tire is generating more lateral grip than the chassis can absorb. Narrower bodies with tighter offset reduce that risk. On carpet or hard floors, the same offset that causes traction rolling on RCP may work perfectly fine because the grip level is lower.

This matters when you are choosing between two bodies that both technically fit your chassis: consider where you race. If you run RCP, stay conservative on front offset and prefer Low Height body styles where available. If your tire compound and body choice are combining to cause traction rolling, the Tire Compound by Surface guide covers how to adjust your compound setup to restore balance before you swap bodies. Sometimes the fix is compound, not the shell.

FAQ (Common Compatibility Questions)

What are the most important numbers to check?

Wheelbase first, then front/rear offset. Width matters, but offset is usually what makes a shell rub or look wrong.

Can I “make” a body fit a different wheelbase?

Sometimes, but it’s rarely worth it. If you’re off by a few mm, the wheels won’t center in the arches and it will look (and often drive) wrong.

Why does my body rub when turning?

Usually front offset is too aggressive or the tire is too wide/tall for the shell. Try reducing front offset (or a narrower tire) first.

Do front and rear offsets need to match?

Not always. Many bodies want different front vs rear offsets to center the wheels properly.

Is “offset” the same thing as track width?

Offset affects track width, but they’re not identical. Track width is the final wheel-to-wheel measurement; offset is one of the main inputs.

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Related Guides

• Wheel Offset and Width Guide — Deep dive into offset numbers, width options, and what fits
• MR-03 Platform Guide — Full RWD upgrade path including body selection
• MR-04 Platform Guide — Narrow GT platform body and setup details
• MA-020 Platform Guide — AWD body compatibility and wheelbase notes
• MA-020 Drift-to-Grip Conversion — Body and wheel changes when converting from drift to grip
• See the Wheel Offset and Width Guide for body and wheel fitment details

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Product images courtesy of Kyosho.