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Mirco GT Diamond Yellow Edition FIA Motorsport Seat

£532.80 Incl. VAT

Mirco GT Diamond Yellow Edition FIA Motorsport Seat by Mirco Racing Seats. Approval: FIA 8855-1999. Brand: Mirco Racing Seats. Construction: Fibreglass seats.

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SKU: MircoGTVelour-Diamond-Yellow-Edition Categories: , , ,
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The Mirco GT Diamond Yellow Edition, 444. A yellow fibreglass shell with black diamond-stitched velour, fixed back, side mount, FIA 8855-1999, four or six point harness compatible, HANS friendly, no head support, for a 32 to 36 inch waist and a driver under six feet.

Yellow shell as standard

Most coloured shells in the Mirco range are a made-to-order option. On this edition the yellow shell is the listing, paired with black velour and diamond stitching, which is what takes it from the 317 of a plain velour GT to 444. If the car is yellow, or the interior wants one loud thing in it, this is the one.

Name embroidery

Personal name embroidery is available. Say what you want when you order, since the seat is trimmed to the order.

The GT

Mirco’s entry homologated bucket. No lateral head support, open at the shoulders, quick to get in and out of.

Harnesses

Four or six point, HANS friendly. A head and neck restraint wants the six point.

FIA and fitting

FIA 8855-1999, with the expiry on the label. Under six feet refers to shell height. Side mount, so mounts and a frame are separate. Tell us the car.

Additional information

Weight 9.5 kg
Dimensions 120 × 80 × 60 cm
Approval

Brand

Construction

Driver Height

Driver Waist Size

Fixing Type

Harness compatibility

,

Product Colour

Trim Material

Optional Extras

Coloured Shell

Mechanism Type

HANS Compatibility

Protection Type

Mirco seat size guide

Mirco make one size of each shell and size the driver by weight and height rather than by waist. The trick is picking the shell built for your build.

How Mirco size their seats

Mirco publish a maximum driver weight and height for each FIA model rather than a waist. The GT is the slim one: up to 85 kg and about 170 to 185 cm. The RS2 goes to 95 kg and 190 cm, the RTS-2 to 100 kg and 190 cm, and the Classic to 100 kg and 185 cm. The RTX-7 is the widest shell in the range at 600 mm across the shoulders.

Across the whole range the shoulder width runs from 490 mm on the Flyer to 600 mm on the GTM and RTX-7. Our waist bands put nearly every Mirco at 32 to 36 inch, with the RTS, RTS 2 and XL also listed at 36 to 40. If you are at the top of a band, take the wider shell.

The RTX-7 in numbersShoulder width 600 mm, hip bolsters 490 mm, lap belt slots 385 mm apart, base 420 x 615 mm, backrest 645 mm, overall height 920 mm, side mount holes 290 mm apart, 9 to 10 kg depending on trim.

Which Mirco fits you

Model Waist band Driver height Shell Approval
FIA 8855-1999
GT (all trims) 32 to 36 Under 6 ft on most trims Fibreglass FIA 8855-1999
RS1 32 to 36 All heights Fibreglass FIA 8855-1999
RS2 32 to 36 All heights Fibreglass FIA 8855-1999
RS7 32 to 36 All heights Fibreglass FIA 8855-1999
RTS and RTS 2 (all trims) 32 to 36 or 36 to 40 Under and over 6 ft Fibreglass FIA 8855-1999
RTX 7 (all trims) 32 to 36 Under and over 6 ft Fibreglass FIA 8855-1999
Classic FIA (Diamond, Houndstooth) 32 to 36 All heights Fibreglass FIA 8855-1999
Road, track and sim (not FIA)
GTS, GTM, GT Day, LS, ST, SX5, SX6, WRC 32 to 36 All heights (GRP GTS, ST and WRC under 6 ft) Fibreglass or carbon Road and track, sim
MX5 (all trims) 32 to 36 Under 6 ft on most trims Fibreglass or carbon Road and track, sim
XL and XL Diamond 32 to 36 or 36 to 40 All heights Fibreglass or carbon Road and track, sim
S2000, S3000 32 to 36 All heights Fibreglass or carbon Road and track
Flyer, S, S Retro, CLS2, FX1 32 to 36 Under 6 ft (CLS2 and FX1 all) Fibreglass Road and track

Mirco driver limits

Mirco’s own figures for the FIA shells. They describe them as approximate, so treat a driver right on a limit as a candidate for the next shell up.

Model Max driver weight Max driver height Seat weight
GT 85 kg 185 cm 8.2 kg
RS2 95 kg 190 cm 10.0 kg
RTS-2 100 kg 190 cm 8.8 kg
Classic 100 kg 185 cm 8.7 kg
RTX-7 Widest shell, 600 mm shoulders Under and over 6 ft 9 to 10 kg

All the FIA shells are side mount with the holes 290 mm apart, five harness slots and HANS friendly.

Measure yourself first

Four numbers decide whether a seat fits. Take them in the clothes you drive in, and write them down before you compare models.

AWaistAround your natural waist, not your trouser size. Trouser sizes usually run an inch or two under the real figure, and the waist bands on our product pages use the real one.
BSeated hip widthSit on a hard chair with your feet flat and measure straight across the widest point of your hips with a rule or a straight edge, not a tape that follows the curve. This is the number that decides whether a fixed shell is tight.
CShouldersStraight across the back at the widest point. Fixed back seats hold you here, so a shell that is narrow at the shoulders is uncomfortable long before it is unsafe.
DHeight and torsoYour height, and if you are over 6 ft whether that is mostly leg or mostly body. A long body needs a taller shell with the head support set higher.

Before you order

  • Check the car, not only the driver. Transmission tunnels, door cards and B pillars are what stop a wide shell going in. Our seat mounting and fixing points guide covers what to measure.
  • Side mount and base mount shells are not interchangeable. Which one you need depends on the car and the subframe, so pick the brackets at the same time as the seat.
  • If you run a HANS or plan to, filter on HANS friendly. The shoulder openings are cut to clear the collar.
  • FIA seats carry an expiry date on the homologation label. Check what your championship accepts and how long the seat has left, particularly on discounted older stock.
Send us your measurementsWaist, seated hip width, height and the car. We have fitted a lot of Mirco seats and will tell you honestly if the one you have picked is going to be tight. Call 0115 989 3488 or email Sales@GSMPerformance.co.uk.

Waist bands and heights are our product data, checked 6 September 2026. Driver limits, weights and the RTX-7 dimensions are from Mirco’s product pages, read the same day.

Will I fit in this seat?
The maker sizes this seat for drivers under 6ft in height with a 32in to 36in waist. Those are the paper numbers; how a seat actually feels to sit in and climb out of is a different question, and our showroom team sit in these seats every day, so call us with your height and waist and we will give you the honest answer.

Is it FIA approved, and for how long?
Yes, it carries FIA 8855-1999 homologation. Every FIA seat has a not-valid-after year printed on its homologation label, and that label date is what a scrutineer checks, so look at the label on the seat you receive and check it against your championship regulations. Buying new means you get the freshest label the maker currently produces.

What do I need to fit it to my car?
This is a side-mount seat: it hangs between side brackets, the motorsport-style stack with fine height and angle control. You will need the car-specific frame, and a sliding runner if you want fore-and-aft adjustment. Our guide on base mount versus side mount walks through the whole stack, and tell us your car and we will quote the full kit.

Does it work with harnesses and a HANS device?
The shell takes 4 point compatible and 6 point compatible. If you are planning the full seat, harness, and HANS setup, tell us the car and we will spec it end to end.

How do I know it will feel right, not just fit on paper?
Fair question, because makers publish widths and weights, never feel, and two seats with identical numbers can feel nothing alike in the car. We keep the ranges on display in the Nottingham showroom, you are welcome to come and sit in them, and if you cannot get to us, call and describe your build, as the team sit in these seats every day. Our head support measurements guide shows the kind of real-world data we collect.

Availability

Mirco seats are custom-made to order

The reason is the choice: over 250 colours and thousands of trim combinations, so each seat is built to the specification you pick rather than taken off a shelf.

That includes the fabric, the colours and the stitching. Lead times vary with the specification, so ask us when you order.

Built to your specification

A seat made to your own trim choice cannot be cancelled once production has started, and our special order terms apply.

Not sure what works together? Ring us. We see these seats in the showroom every day and can tell you how a combination actually looks.

Mirco-Motorsport-FIA-Racing-Seats-GSM-SS4U-Show-room

In-store displays:

We have a premium range of over 125 seats from brands including: Bimarco, Cobra, Corbeau, Sparco, OMP, Recaro, GP-Race, and Bride to name just a few brands we work with.  

Alongside this, we also stock and display HANS devices, harnesses, race-wear, race-suits, FIA helmets and various other safety equipment. If you are looking to visit us to see and try any particular seat or product, please contact us in advance and we’ll be happy to help.

In-Store appointments:

Book now!

Due to the specialist nature of our services, we do ask that you please contact us in advance to book an appointment. We have multiple slots available each day including selected availability at the weekend.

Working by appointment allows us to dedicate our time with you and provide a personal and professional service. We’ll always ensure you leave with the right equipment for your needs.

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Klarna is available to UK residents aged 18 and over. Subject to status. Terms and conditions and late fees apply. Klarna Financial Services UK Limited is authorised and regulated by the Financial Conduct Authority. Full details at klarna.com/uk. Every way you can pay with us is on our payment and finance page, or call 0115 989 3488 and we will talk it through.

Fast delivery lead times:

If you require fast delivery, please contact us in advance of ordering and we’ll happily check stock allocation and availability for you. We carry a large amount of stock at our showroom and across multiple distribution hubs. This allows us to provide immediate dispatch across a huge number of brands from Corbeau and Cobra through to Sparco and OMP. (Does not apply to all items)

Due to the niche market we work in, some products are custom hand made to order, or special order from manufacturers like PCI Racing and Planted Technology. If you want to know how fast a product will be dispatched. Simply drop us a message through our Contact us form.

ParcelForce

Addtional lead time notes:

Quick dispatch: Stocked products are dispatched within 24-48 hours with Parcel Force.
Sparco roll cages: We can only deliver these to a registered (LTD) company address.
In-store collection: Please contact us in advance to book an in-store collection appointment.

Guides and advice

GuideBase Mount Or Side Mount? The Bucket Seat Fitting Stack Explained
GuideHow Deep Are Bucket Seat Head Supports? Cameron Measured Every Shell In The Showroom
GuideThe complete guide to universal seat sliding runners
GuideHow Long Do FIA Harnesses Last? Expiry Dates And The Rules Explained

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