VS Chassis Tuning Guide
The VS chassis is one of Tamiya's rear-motor "counter gear" designs — the family that also includes Super-X, Super-XX, Super TZ, Super TZ-X, Super-II and Type 5. Tamiya's own chassis reference lists it at 145mm long, 90mm wide, with an 80mm wheelbase, 64mm tread and a published weight of 113.8g, running a 5mm ground clearance and a choice of 5:1, 4.2:1 or 4:1 final gear ratios. Those numbers explain the chassis's reputation: short wheelbase, narrow tread, and among the lightest bare chassis Tamiya has published specs for. A VS build feels quick off the line, but that same short wheelbase and slim gear cover are exactly what modern jump-heavy five-lane layouts stress hardest. This guide works from Tamiya's own published figures to explain what the VS chassis is, where it sits next to its siblings, and how to tune one without fighting its geometry.
VS chassis anatomy: hinged gear cover, low parts count
The defining feature of the VS chassis is its hinged gear cover and battery holder, built for fast maintenance — flip the cover, swap gears or batteries, close it, done. That hinge is also the chassis's main mechanical question mark: the cover has to seat flush and latch securely every time, or the counter gear mesh drifts and the car develops an intermittent whine or skip under load. Because VS is a fixed-ratio counter-gear design rather than a chassis with a floating gearbox, gear alignment is set almost entirely by how cleanly the cover seats against the tub — a five-second check before every run, cover fully closed with no gap on either side, replaces most of what other chassis solve with a gearbox screw.
How VS compares to its rear-motor siblings
Tamiya's chassis reference publishes dimensions for the whole counter-gear family side by side. VS reads as the lightest and narrowest-tread member; the numbers below are Tamiya's own published baseline figures and will vary slightly with the tyres, wheels and option parts actually fitted.
| Chassis | Wheelbase | Tread | Weight | Character (Tamiya) |
|---|---|---|---|---|
| VS | 80mm | 64mm | 113.8g | Lightweight, compact, short wheelbase |
| Super-II | 80mm | 64mm | 115g | Race-ready refinements on the same footprint |
| Type 5 | 82mm | 64mm | 113g | Emphasis on stability |
| Super TZ-X | 82mm | 68mm | 115.4g | Low battery position, advanced Super TZ |
| Super TZ | 82mm | 68mm | 117.6g | Low centre of gravity |
| Super-X | 84mm | 70mm | 111.8g | Long wheelbase, durability-focused |
| Super-XX | 84mm | 70mm | 119g | Super-X evolution, wider adaptability |
VS and Super-II share the same 80mm/64mm footprint, which is why the two are often cross-shopped as parts donors for each other; if you outgrow VS's durability limits without wanting the wider Super-X/XX tread, Super-II tuning is the nearest lateral move, while Super-X/Super-XX tuning covers the wider, longer-wheelbase branch of the same family.
Where VS actually breaks down
The short 80mm wheelbase and 64mm tread that make VS light and flickable also give it the least pitch and roll leverage in this chassis family — a hard jump landing has less wheelbase to spread load across, so shock reaches the side stays and gear cover latch faster than on the 84mm Super-X/XX pair. In practice this shows up as three things: the gear cover popping or shifting under repeated impact, side-stay mounting points wearing oval under vibration, and rear shaft bushings loosening faster than on a longer-wheelbase design of similar weight. None of this makes VS unsuitable for racing — it rewards a light, well-maintained build over a heavily reinforced one, because reinforcement adds back the mass the chassis's low weight was designed to avoid.
Tuning order for a VS build
Work in this sequence rather than adding parts speculatively:
- Gear cover and mesh first. Close the cover, check for a flush seat on both sides, and spin the wheels by hand to feel for binding before anything else is touched.
- Shaft straightness and bearings. A bent shaft or a dry bushing costs more speed on a VS than a motor swap gains back — see the gears guide for mesh and shaft basics that apply directly here.
- Motor choice matched to your gear ratio. VS ships with 5:1, 4.2:1 or 4:1 options; a higher-RPM motor on the numerically lower 4:1 ratio needs more straight-line room to reach its power band than on 5:1. Cross-check your pick against the motors guide.
- A restrained roller and stay package. Keep the stack low; every extra plate is mass the chassis wasn't built to carry gracefully. The stays guide covers when a new plate actually solves a problem.
- Light mass damping only for a proven landing problem. Mass damper placement explains why more damper mass isn't automatically better on a light chassis.
Where VS sits against the universal rules
Tamiya's official regulations are chassis-agnostic: no VS-specific clause exists, and the same width (under 105mm), height (under 70mm), length (under 165mm), minimum ground clearance (at least 1mm) and minimum all-up weight including battery and motor (at least 90g) apply to every approved machine type. VS's 145mm length, 90mm width and 113.8g published weight clear those thresholds comfortably before parts are even fitted, so the chassis itself is not the limiting factor for legality — your roller, stay and body choices are. Tyre diameter (22–35mm), tyre width (8–26mm), and the ban on homemade or heavily cut chassis apply the same way to a VS build as to any other. Organiser rules and on-day technical inspection prevail — check the current official regulations and, for stock-class events, the Stock Class rules before entering, and see the official rules and tech-inspection checklist for what an inspector actually checks.
Frequently asked questions
Is the VS chassis still competitive against VZ, MS or MA cars?
It can hold its own on a technical, low-jump course where its light weight and short wheelbase are an advantage, but it is not the chassis to pick for a rough, high-impact five-lane track — that is where the durability gap against newer platforms like VZ or MS shows up fastest.
Why does my VS car develop a gear whine after a few packs?
Check the gear cover seat first — a cover that isn't fully latched lets the counter gear mesh drift slightly under load, which is the single most common noise complaint on this chassis. Confirm it's flush and re-seated before assuming the gears themselves are worn.
Should I run VS in an official Tamiya-sanctioned event?
Nothing in the current official regulations excludes it by name, but confirm eligibility with the event organiser first — chassis, parts and inspection rules are set per event, and organiser and on-day technical inspection decisions prevail over any general guide, including this one.