Wheel rev 1: 110 mm of split-TPU attitude
The wheels got more design love than any other part so far — which is exactly why they were the right place to start sweating details. Rev 1 is a 110 mm × 55 mm split TPU tire: two 27.5 mm halves joined by a stepped lap joint, with chevron tread that bridges the seam so there's no debris-catching groove.
The rim is a two-piece beadlock clamped by an eight-bolt circle, with a 6 mm hub bore, two angled set screws, and a separately bolted front cap embossed with a Bobby portrait. Triangular webbing inside the tire keeps it light but honest.
WHEEL REV 1 — KEY FEATURES
| Tire | 110 mm OD × 55 mm wide, split TPU, chevron tread |
| Rim | Two-piece beadlock, 8-bolt clamp circle |
| Hub | 6 mm bore, 2× angled set screws, protruding rear hub |
| Cap | Bolt-on, embossed Bobby portrait (~0.8–1 mm depth) |
| Rev 2 plans | Countersunk screw heads, inset hubs, tolerance cleanup |
Sectional analysis caught a real problem
A cross-section review showed the motor-shaft set screw sits too close to the rim for tool access — the wheel couldn't be removed without a fight. One more edit before printing: likely moving shaft clamping to the front, under the removable Bobby cap.
Rule of the shop: print one complete test wheel before the other three.
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