Need An Ultra Narrow Fibreglass Bucket Seat? We've Got The Answers
Narrow bucket seat guide
Some cars simply do not have room for a normal bucket seat. Owners of small, tight cockpits, such as the classic Mini, the Mazda MX-5 and the Honda S2000, often find that the seats they like are too wide at the shoulders or the base, and the narrow seats they can find are basic steel framed designs.
If you want a narrow seat with a proper fibreglass shell, Mirco make three worth knowing: the SX5, the SX6 and the MX5. Here is how they compare, how they mount, and what to weigh up against a steel framed seat.
- Mirco SX5 and SX6: 490mm across the shoulders, 450mm at the waist, 890mm tall
- The SX5 has a modern padded trim; the SX6 has retro vertical flutes
- The Mirco MX5 is a little wider, and side mounted
- The fibreglass SX5 and SX6 are base mounted
- None of the three is FIA homologated: road, track day and sim use
- All come in a choice of trims and shell colours
What is on this page
Fibreglass or steel framed?
When space is tight, many people look first at steel framed bucket seats, because some are very slim. There are trade-offs worth thinking about before you choose one.
Weight. A steel frame with padding over it is usually heavier than a fibreglass shell of the same size, and in a small, light car the difference is more noticeable.
Shape and support. Steel framed seats often have a flatter, simpler shape. A moulded fibreglass shell can be contoured to wrap around you, which gives better support at the sides when the car is cornering hard.
Approval. This is where care is needed. Being fibreglass does not make a seat FIA approved. The three Mirco seats in this guide are not FIA homologated, and neither are most steel framed seats. For road use, track days and sim rigs that is fine, but if your event needs an FIA seat, you need an FIA approved model.
Mirco SX5 and SX6
The SX5 is one of the narrowest fibreglass bucket seats we sell. Mirco's drawings put it at 490mm across the shoulders, 450mm at the waist, 470mm across the front of the cushion and 890mm tall, with 370mm between the bolsters for your hips.
The SX6 is the retro take on the same idea, with vertical flutes down the centre panels and a slightly different look to its harness slots. It suits an older car where a modern padded trim would look out of place.
Both fibreglass versions are base mounted: they bolt through the base onto runners, a base plate or a rig platform, not onto side mounts. They take a four point harness, suit drivers of any height with a 32 to 36 inch waist, and are available in velour in black or black with blue, grey or red, with the shell in a choice of colours. There is also a carbon version of each, and a steel framed SX6 that side mounts.
With shoulders that narrow, they are worth a look for cars such as the classic Mini, the MX-5 and the S2000. Every car is different, though, so measure the space in yours and tell us the car before you order.
Mirco MX5
The MX5 gives a little more room than the SX5 and SX6, at around 530mm across the shoulders, while staying compact. Despite the name, it is not a Mazda part: MX5 is Mirco's name for the shell, and it will go in any car that suitable side mounts and a frame will fit.
Unlike the fibreglass SX seats, the MX5 is side mounted, so it needs a pair of side mounts and a frame for your car. It has an integrated headrest and is suited to drivers under six feet with a 32 to 36 inch waist.
It comes in several trims. The velour version is soft and warm, and lists a four point harness. The vinyl version wipes clean and lists both four and six point harnesses, which is useful for a track day car on full belts. There are also special editions, such as the houndstooth seats in our photos.
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From £336.00 Incl. VATPayPal Credit250+ coloursKlarna ReadySelect options This product has multiple variants. The options may be chosen on the product page
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From £336.00 Incl. VATPayPal Credit250+ coloursKlarna ReadySelect options This product has multiple variants. The options may be chosen on the product page
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From £324.00 Incl. VATPayPal Credit250+ coloursKlarna ReadySelect options This product has multiple variants. The options may be chosen on the product page
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From £315.60 Incl. VATPayPal Credit250+ coloursKlarna ReadySelect options This product has multiple variants. The options may be chosen on the product page
The three side by side
| Seat | Shoulder width | Mounting | Harness | Style |
|---|---|---|---|---|
| Mirco SX5 | 490mm | Base mount (fibreglass) | 4 point | Modern padded trim |
| Mirco SX6 | 490mm | Base mount (fibreglass) | 4 point | Retro vertical flutes |
| Mirco MX5 | About 530mm | Side mount | 4 point (velour), 4 or 6 point (vinyl) | Integrated headrest |
Why these Mirco seats suit small cabins
Width. They are among the narrowest fibreglass seats we list, which is the whole point in a small car.
Weight. A fibreglass shell keeps the weight down compared with many framed seats.
Choice. Mirco make seats to order, with a range of trims, panel colours, shell colours and name embroidery, so a narrow seat does not have to be a plain one.
Garreth’s advice for a tight cockpit is to measure three things before choosing: the width of the floor between the tunnel and the sill, the width at shoulder height, and the headroom. Send us those with your height and waist size, and we will tell you which of these seats, if any, will fit.
What is the narrowest fibreglass bucket seat you sell?
The Mirco SX5 and SX6 are among the narrowest, at 490mm across the shoulders.
Are the Mirco SX5, SX6 and MX5 FIA approved?
No. They are for road, track day and sim use, not events that require an FIA seat.
Is the Mirco MX5 made for the Mazda MX-5?
No. MX5 is Mirco’s name for the shell; it fits any car suitable side mounts and a frame will fit.
How do the SX5 and SX6 mount?
The fibreglass versions are base mounted, onto runners, a base plate or a rig platform.
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For tight cockpitsMirco SX5, SX6 and MX5
Narrow fibreglass shells for small cars, for road, track day and sim use.
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