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doneI've built the 205/55 R16 91V tyre on a 6.5Jx16 ET45 rim with the 5x112 bolt pattern, standing on a strip of road. It builds with 46 parts, is 948 × 305 × 633 mm overall, and looks right in the four-view render.
**What's in it:** The tyre has a tread band made of 24 blocks, two rounded shoulders and two sidewalls. The rim has a barrel, two flanges and a drop centre that sits toward the outer side. There is a five-spoke disc, a hub mounting face 45 mm outboard of the rim centre plane, five bolt holes shown as dark cylinders, the centre bore, a brass valve, and the road.
**How the two state inputs move the parts:**
- **Wheel angle** turns the spokes, bolts, valve and tread blocks about the axle.
- **Wheel load** lowers the axle by load ÷ stiffness (19.0 mm at 4000 N). Tread blocks that would reach below the road are shortened so they sit flat on it, which lengthens the contact patch.
**Results at the default inputs:**
| Result | Value |
|---|---|
| Sidewall height | 112.75 mm |
| Overall diameter | 631.9 mm |
| Unloaded radius | 315.95 mm |
| Static loaded radius | 296.9 mm |
| Rolling circumference | 1927 mm |
| Revolutions per km | 519 |
| Load capacity | 618 kg |
| Maximum speed | 240 km/h |
| Share of capacity in use | 66 % |
| Contact patch length | 216 mm |
| Mounting face from rim centre plane | 45 mm |
| Road speed at 1000 wheel rpm | 115.6 km/h |
**Inputs you can change in the Inputs panel:**
| Input | Range |
|---|---|
| Section width | 155–305 mm |
| Aspect ratio | 30–80 |
| Rim diameter | 13–22 in |
| Rim width | 4.5–10 in |
| Offset | 0–60 mm |
| Number of bolts | 4–6 |
| Bolt circle | 98–130 mm |
| Centre bore | 54–75 mm |
| Load index | 70–110 |
| Speed symbol | T / H / V / W / Y (menu) |
| Radial stiffness | 150–350 N/mm |
| Wheel load | 0–6000 N |
| Wheel angle | 0–360° |
The model still built when I set all of them to extreme values at once.
**Limits:**
- There are no boolean operations here, so the bolt holes and centre bore are drawn as dark cylinders, not cut out.
- The flattening is simplified. Only the tread blocks flatten against the road. At heavy loads the shoulders shrink slightly instead of bulging out.
- The spoke count is fixed at five whatever the bolt count.
- The inputs don't check that the tyre and rim are a sensible pair. A 10-inch rim under a 155 mm tyre will build, with the flanges sticking out past the tyre.
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promptA passenger-car wheel and tyre built from their designations: a 205/55 R16 91V tyre on a 6.5Jx16 ET45 rim with a 5x112 bolt pattern. Parts: the tyre (tread band, two shoulders, two sidewalls), the rim barrel with its two flanges and a drop centre, the wheel disc with five spokes, a hub mounting face, five bolt holes shown as dark cylinders, the centre bore, a valve, and a strip of road under the tyre. Inputs: section width 205 mm, aspect ratio 55, rim diameter 16 inches, rim width 6.5 inches, offset 45 mm, bolts 5, bolt circle 112 mm, centre bore 57.1 mm, load index 91, speed symbol (a choice of :t, :h, :v, :w, :y, default :v), radial stiffness 210 N/mm, and the STATE inputs wheel-load-n (default 4000) and wheel-angle-deg. The wheel turns with its angle; the load flattens the tyre at the road, so the axle sinks by load over stiffness and the contact patch lengthens. Compute: sidewall height, overall diameter, unloaded radius, static loaded radius, rolling circumference (about 3.05 times the overall diameter), revolutions per km, load capacity in kg from the load index (45 x 10^(LI/80)), maximum speed in km/h from the symbol (190, 210, 240, 270, 300), the share of capacity in use, contact patch length, the distance of the mounting face from the rim centre plane, and road speed in km/h at 1000 wheel rpm.
(This prompt was written by Claude, Anthropic's AI model, as one entry in a catalog of simulative models of automotive systems.) House brief: key dimensions and operating values are root inputs with input-controls (ranges the model holds at); STATE inputs must really move the parts; each result named above is a computed-slot of MODEL with a doc string giving its unit; simplified but recognisable geometry, about 15 to 80 leaves; colours only from Gendl's own table, hyphenated: :steel-blue, :slate-gray, :dim-gray, :silver, :brass, :copper, :bronze, :firebrick, :goldenrod, :orange, :red, :black, :dark-olive-green.
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