Tamiya Mini 4WD Cases and Storage: All Eight Compared
Eight cases and storage items sit in this catalogue, and they are not eight versions of the same box. Each one is built for a specific thing: motors, batteries, small hardware, a full pit day, or just the fleet of cars themselves. Buying the biggest case in the range when what you actually need is somewhere to keep pinion gears sorted is a common way to overspend and still not solve the problem. Here's what each of the eight is actually built to hold, from Tamiya's own published dimensions and descriptions.
Everyday parts organisation: Parts Case and Parts Storage Box Set
The Mini 4WD Parts Case (item 15163) is divided into six internal compartments for pinion gears, screws, nuts, bearings and similar small parts — a single, fixed-layout box for a modest hardware collection. The Parts Storage Box Set (item 15460) goes further: two 8-compartment cases housed inside an outer case, for 16 independent sections total. Its own listing notes two of these sets fit neatly inside one compartment of the Mini 4WD Portable Pit below — it's designed as a nested add-on for someone who already owns or plans to own the bigger case, not a standalone unit for a small collection.
Motors specifically: Motor Case 2
Motor Case 2 (item 15505) holds 8 Mini 4WD car motors, single- or double-shaft, plus a separate section for pinion gears. The compartments are shaped so motors don't knock into each other in transit — a real consideration once you're carrying Tuned, Dash and PRO motors side by side. Tamiya's own guidance for it is specific: don't drop it or subject it to shocks, and keep it out of high heat, both of which can damage the case (and, by extension, whatever motor is inside it).
Batteries specifically: Battery Case 2
Battery Case 2 (item 15521) is sized at 90mm × 120mm × 22mm and holds ten R6/AA/UM3 cells, or a mixed load — four R6/AA/UM3 with ten R03/AAA/UM4, or seven R6/AA/UM3 with five R03/AAA/UM4 — by rearranging the interior. It's molded in slightly opaque polypropylene. If your kit runs on AAA cells alongside AA, this is the one case in the range built to carry both formats in the same box rather than needing two separate battery cases.
Whole cars and a full pit day: PRO Racer's Box and Portable Pit
The Mini 4WD PRO Racer's Box (item 15354, 355mm × 205mm × 145mm) expands into internal sections once opened, with movable dividers and a bottom section that holds up to three fully hopped-up cars. The Mini 4WD Portable Pit (item 15424, 210mm × 430mm × 155mm) is a two-case system that carries up to four cars along with tools, batteries and parts in door compartments — Tamiya's own listing is explicit that the cars, tools, parts and batteries themselves aren't included, only the case. Between the two, the Racer's Box suits a smaller kit for two or three cars and their immediate tools; the Portable Pit is built for a full race-day loadout across more cars, with the Parts Storage Box Set above sized to nest inside it.
Cosmetic protection and a niche extra: Clear Covers and the 30th Anniversary Catcher
Basic Mini 4WD Car Box Clear Covers (item 10322, a 3-piece set) are stackable clear PET sleeves that slip over a car's storage box for display and light protection, available with blue, red or white logo-strip variants — cosmetic and stacking convenience, not a transport case. The Fully Cowled Mini 4WD 30th Anniversary Mini 4WD Catcher (Black, item 95669) is a commemorative accessory in this category; unlike the other seven, Tamiya's own listing text for it doesn't publish a capacity or material spec, so treat it as a named collectible rather than assuming it matches the storage capacity of anything else on this list.
Matching a case to your fleet size, not the biggest one available
A single-car beginner needs the Parts Case for hardware and, if they're running rechargeable AAs, nowhere else specific — a full Portable Pit is overkill at that stage. Someone building toward a three- or four-car field-day loadout is the actual target for the Portable Pit plus a nested Parts Storage Box Set, with Motor Case 2 and Battery Case 2 handling the two things a pit box's generic compartments don't specialise for. Buy for the fleet size you actually have, not the case that looks most complete on a shelf — see the pit tools guide for what belongs in the kit alongside whichever case you choose.
Frequently asked questions
Which case should I buy for my first car?
The Mini 4WD Parts Case (six compartments) covers small hardware for a single car. A full Portable Pit or PRO Racer's Box is built for carrying multiple cars plus tools and parts to an event — see the pit tools guide for the rest of a starter kit.
Does the Motor Case fit double-shaft PRO motors?
Yes — Tamiya's own listing for Motor Case 2 states it holds up to 8 motors, "single or double shaft."
Can the Portable Pit and Parts Storage Box Set be used together?
Yes — the Parts Storage Box Set's own listing notes two of the sets fit inside one compartment of the Portable Pit, so they're designed to nest rather than compete for the same job.