The Smart Roadster hardtop was a factory option available on all 452 variants from 2003–2006, most commonly found on the Roadster Coupé body style, which featured a fixed glassfibre rear section. Standalone removable hardtops were also produced for the open Roadster, and genuine used examples remain the primary source today.
Few roof choices define a sports car’s character as sharply as the decision between canvas and fibreglass. On the Smart Roadster 452, that choice was baked into the model range from the outset, and it continues to shape the used-car market two decades on. Whether you own an open Roadster and want the refinement and security of a solid lid, or you’re shopping for a Coupé variant and trying to understand exactly what you’re buying, this guide covers every angle: factory fitment history, the structural and aesthetic differences, where the hardtops actually come from, how to source one in 2024, and how to fit it without drama.
The Smart Roadster Hardtop in the Factory Line-Up
Smart launched the 452 in two distinct body styles. The Roadster was a conventional open two-seater with a folding fabric softtop. The Roadster Coupé — sometimes written as Roadster-Coupé — added a large glassfibre rear section that covered the engine lid area and blended into buttresses either side of a rear screen, giving the car a fastback silhouette reminiscent of a miniature Porsche Targa. Critically, the Coupé’s rear hardshell is a structural, semi-permanent piece, not a removable panel in the traditional sense.
For open Roadster owners, Smart also offered a bolt-on hardtop as a genuine factory accessory. This is a separate glassfibre shell that clamps over the folded softtop mechanism and seals against the windscreen header rail and rear body flanges. It was available through Smart dealers as an optional extra or could be ordered as a complete accessory package. The Brabus-branded variants — the 66 kW SB2 and the full 74 kW Brabus — were offered in both open and Coupé configurations, so hardtop variants of the Brabus are not especially rare.
If you are comparing the long-term trade-offs between a soft roof and a hard one, our detailed breakdown of weather protection, weight and daily usability covers the structural and practical differences in depth.
Smart Roadster Hardtop: Coupé vs Removable Accessory — Understanding the Difference
This distinction trips up a surprising number of buyers and even some sellers. The two types of hardtop are not interchangeable:
The Coupé Rear Section
Bonded and bolted to the Coupé body, this piece incorporates the rear screen, the buttresses and the engine-lid surround. It cannot be unbolted and transplanted onto a standard open Roadster without significant structural work. The Coupé also has a different rear quarter profile and different seal geometry. If you see a listing claiming to sell a ‘Coupé hardtop’ as a removable item, treat it with caution.
The Removable Accessory Hardtop
This is the panel that fits an open Roadster. It is a clamshell of glass-reinforced plastic (GRP), colour-matched or in a contrasting tridion silver, that locates over the folded roof mechanism. It attaches at the windscreen header with two over-centre clamps and at the rear with two bolts that thread into captive nuts in the body. A rubber seal around the perimeter compresses against the door tops and body flanges. The rear screen in the accessory hardtop is a separate plastic or glass item bonded into the shell.
Understanding which type of car you are inspecting is essential. Our pre-purchase inspection checklist includes specific points to check on Coupé rear sections and removable tops, including delamination and seal condition.
Sourcing a Smart Roadster Hardtop Today
New old stock (NOS) from Mercedes-Benz/Smart dealers is essentially exhausted. Your realistic options in order of preference are:
- Specialist breakers: UK Smart Roadster specialists occasionally break Coupés and open cars with accessory tops. Ringtail, eBay’s Smart-specific sellers and a handful of German dismantlers are the primary sources. Prices for a complete accessory hardtop in good condition range from approximately £300 to £700 depending on colour and condition.
- Owner clubs and forums: The Smart Car of America forum and the UK-based Smart Owners Club regularly have hardtops listed in their classifieds sections, often with known history.
- European eBay markets: Germany (eBay.de) and France (Leboncoin) produce a steady trickle of hardtops. Because the Roadster sold in larger numbers on the continent, supply is better than in the UK. Factor in shipping — a hardtop is bulky but not excessively heavy at around 12–15 kg.
- GRP fabricators: A small number of UK composite workshops have made reproduction hardtops using original shells as patterns. Quality varies widely; inspect in person before committing.
Colour matching is a genuine challenge. Smart used a wide palette of body colours, and a mismatched hardtop requires professional respraying. Factor in £200–400 for a quality colour-match respray when budgeting.
Condition Checks Before You Buy a Second-Hand Hardtop
GRP ages in predictable ways. Before handing over money, check these specific points:
Delamination and Gel-Coat Crazing
Run your palm firmly across the surface. Soft spots, bubbling or a hollow sound when tapped indicate moisture ingress into the laminate. Minor crazing in the gel coat is cosmetic and can be polished or resprayed, but structural delamination around the mounting flanges is a rejection criterion.
Rear Screen Condition
Acrylic rear screens scratch easily and yellow with UV exposure. A yellowed or crazed screen significantly reduces rearward visibility. Glass rear screens — fitted to some later production hardtops — fare better but are heavier. Replacement acrylic screens can be cut to pattern by a glazier for under £100.
Seal Integrity
The perimeter rubber seal is the hardtop’s weak point in service. Compression-set rubber lets water track along the door tops and into the cabin — a well-documented Smart Roadster issue. Check the seal is supple and returns to shape after compression. If not, factor in a seal replacement. Our guide to choosing and fitting a roof seal kit applies equally to hardtop perimeter seals and is worth reading before you purchase.
Clamp and Fastener Condition
The windscreen header clamps are chromed steel over-centre mechanisms. Check for corrosion and that the cam action is positive. Rear mounting bolts should be M8 and thread smoothly — seized or stripped captive nuts in the body are repairable but time-consuming.
How to Fit the Smart Roadster Hardtop
Fitting is a two-person job. The shell is manageable alone but awkward, and the risk of scratching the windscreen frame or body panels is real if you work solo. Allow 30–45 minutes for a first-time fit; experienced owners can do it in under 10.
- Fold and stow the softtop fully into its bay. The hardtop cannot fit over a partially folded roof.
- Clean all mating surfaces — windscreen header rail, door top flanges and rear body lip — with isopropyl alcohol. Any grit here will abrade paint under the seal.
- With a helper, lift the hardtop from the rear of the car, shell-side down, and lower it forward to engage the rear body lip first.
- Push forward gently until the front edge of the hardtop sits against the windscreen header rubber. Do not force it.
- Engage the over-centre clamps at the windscreen header. These should close with firm hand pressure only. If they feel excessively tight or loose, the front seal thickness may need adjustment with a shim or the seal may need replacing.
- Thread and hand-tighten the two rear bolts from inside the engine bay area (the bolts pass through apertures at the rear lower edge of the hardtop shell). Torque to approximately 10 Nm — firm but not aggressive on the captive nuts.
- Check the perimeter seal visually all the way round. Any lifted or kinked section needs correcting before driving.
Note: some owners apply a thin film of silicone grease to the perimeter seal to improve weather resistance and reduce seal wear. Avoid petroleum-based products which degrade rubber rapidly.
Smart Roadster Hardtop and the Coupé Body: Aesthetic Considerations
The removable accessory hardtop and the integrated Coupé rear section produce very different visual results. The accessory top gives the open Roadster a blunter, more upright rear profile — functional, but lacking the flowing buttresses of the Coupé. Some owners accept this compromise willingly for the flexibility of removing the top in summer. Others find the Coupé’s fixed silhouette worth the loss of open-air motoring.
If the aesthetics question leads you toward wider styling changes — widebody arches, Brabus bumpers or a rear diffuser — our guide to body kits and aero components that actually fit the 452 will save you considerable time and money by highlighting the compatibility pitfalls before you buy.
It is also worth considering the Coupé’s structural advantage: the fixed rear section adds appreciable torsional rigidity to what is already a stiff chassis. Open Roadster owners fitting a removable hardtop do not gain the same structural benefit, though the added mass of the shell does marginally damp scuttle shake on rougher surfaces. If you are interested in how suspension changes interact with chassis stiffness, our comparison of lowering springs versus coilovers touches on this in the context of ride and handling balance.
Frequently Asked Questions
Can I fit a Smart Roadster Coupé rear section onto a standard open Roadster?
Not straightforwardly. The Coupé rear section is integrated into the bodyshell and requires different rear quarter panels and seal geometry. While custom fabricators have achieved conversions, it is a major structural undertaking involving body modifications, repainting and significant cost — not a practical DIY project.
What does a genuine Smart Roadster hardtop weigh?
The GRP accessory hardtop weighs approximately 12–15 kg. It is manageable by two people but awkward alone. The additional weight sits high and rearward, which has a minor effect on handling balance — most owners consider this negligible at road speeds.
Will the hardtop affect the softtop mechanism when it is stored?
No — the hardtop sits over the folded softtop and does not contact the roof mechanism directly. However, the softtop must be fully and correctly stowed before the hardtop is fitted. Attempting to fit the hardtop over a partially deployed roof risks damaging the fabric and the GRP shell.
Are there any aftermarket or reproduction Smart Roadster hardtops available new?
A very small number of GRP fabricators have produced reproduction shells, primarily in Europe. Quality is inconsistent and fitment may require adjustment. No large-scale aftermarket production exists. The used original market remains the most reliable source, with prices typically between £300 and £700 for a usable example in matched or repaintable condition.
