Our Smart steering wheel hubs make OE-to-motorsport swaps straightforward with model/year-specific adapters. The correct hub keeps the horn functional and—on airbag cars—the proper resistor load. For Fortwo (450/451/453), Forfour (454/453) and Roadster (452), expect precise fitment, rigid clamping and a tidy, vibration-free feel for daily use and track days.
Net price: 78 €
Brief summary + key benefits
The Smart – steering wheel hubs category helps you swap the OE wheel for an aftermarket rim safely and neatly. Model-specific adapters ensure the correct spline interface, reliable horn function and—on airbag cars—the right resistor load. Core benefits include precise fitment, durable clamping, crisper feedback and ergonomic reach across Fortwo (450/451/453), Forfour (454/453) and Roadster (452), including electric (EQ) variants.
Technical Basics
A hub bridges the column’s taper/spline to common motorsport bolt patterns. Most aftermarket wheels are 6×70 mm (MOMO/Sparco); some systems are 6×74 mm (Nardi/Personal). Quality steel/aluminium constructions deliver play-free torque transfer and low vibration. The offset (depth) defines driver reach, steering arc and stalk access—choose it carefully to preserve instrument visibility and trim clearance at full lock. On airbag-equipped Smarts a correctly valued resistor is required to maintain system load and avoid warnings.
Generational notes: Fortwo 450 differs from 451 and 453 in spline profile, horn-ring layout and shroud geometry. Forfour 454 (first gen) and 453 (later gen) are not identical; verify connector layouts and trims. The Roadster 452 features unique packaging, so mock-ups are useful to confirm clearances. Always check the hub’s application list for production year, options (heated/multifunction wheel) and your wheel’s bolt circle.
Common pitfalls include mismatched bolt patterns (6×70 vs 6×74), an offset that causes shroud contact, using bolts of incorrect length, and over-torquing wheel-to-hub screws. Clean, dry mating faces and adherence to specified torque (Nm) mitigate these issues and ensure long-term reliability.
Selection Criteria
Bolt pattern: confirm whether your wheel is 6×70 or 6×74 and match the hub accordingly. Spline: pick the exact column interface for your generation—Fortwo 450/451/453, Forfour 454/453, Roadster 452. Offset (depth): for commuting, OE-like reach is comfortable; for track/autocross, a shorter hub with a smaller rim yields a more direct feel. If adding a quick release or a spacer, include their stack height and re-check cluster visibility.
Design & materials: look for reinforced wall thickness around the flange and taper, precise machining and corrosion protection. Use quality fasteners of class 8.8/10.9 tightened to spec (Nm). With any added stack, choose longer bolts and maintain at least 1–1.5× fastener diameter in thread engagement. Treat wheel diameter and grip profile as parts of the system to keep stalks accessible and comfortable.
Use cases: On a daily Fortwo 451, mid-depth offsets preserve comfort and visibility. The Roadster 452 benefits from a shorter hub for sharper response on track days. For Forfour 453 family cars, OE-like reach reduces fatigue; a small spacer can fine-tune posture for taller drivers.
Installation & Maintenance
Disconnect the battery before work (critical on airbag cars). Mark the OE wheel’s centre, remove trims and the locknut per the service manual. Seat the hub on a clean, dry taper; avoid lubricants on splines/taper. Tighten the locknut to the specified torque and use threadlocker only if recommended by the manufacturer.
Fasten wheel-to-hub screws in a star pattern to the correct torque. After 100–200 km—or after heavy use—perform a re-torque and inspect for loosening, shroud contact and wire tension at full lock. If a quick release is fitted, periodically check latch wear and keep mating faces clean to maintain zero play over time.
FAQ
Q: Which bolt pattern is most common on Smart-compatible wheels?
A: Many aftermarket rims are 6×70 mm; some systems use 6×74 mm. Match the hub to the wheel.
Q: Do airbag-equipped cars need a resistor?
A: Often yes—the correct resistor value prevents warning lights after the swap.
Q: How do I choose hub depth?
A: Keep OE-like offset for daily comfort; go shorter for a more direct track feel.
Q: Can I use a spacer with a quick release?
A: Yes—include both in the reach calculation and verify instrument visibility and full-lock clearance.
Q: What hardware should I use?
A: Quality 8.8/10.9 fasteners torqued to spec (Nm) in a star sequence; adjust length for any added stack.
