Tillett W3 GRP Racing Car Seat

From £407.92 Incl. VATFrom £407.92 Excl. VAT

Tillett W3 Racing Car Seat by Tillett Seats. Brand: Tillett Seats. Additional Back Frame: No back frame, With back frame. Brackets included: Seat only.

Additional Back Frame

Rolled Edges Option

40cm Width with rolled edges cut off

44cm with rolled edges left on

Seat Cover Options

two Dinamica faux suede covered panels

Without Seat Cover

Clear

Tillett logo colour

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Size/Fitting guide

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The Tillett W3 is a GRP racing seat in the W series of the Tillett range, Road and Track approved. Part number W3-44-Black-GRP for the 44cm configuration. Shell is fibreglass, black, with no head support. Six-point harness compatible.

The W3 mounts by base mount. A back frame is available as an option for cars or class regulations that require one. Seat cover options are two Dinamica faux suede covered panels or bare shell.

Width is the main configuration choice on the W3: 40cm with the rolled edges cut off, or 44cm with them left on. The outer dimension affects clearance against the car’s tunnel and sill, so measure the available width in your car before ordering.

Within the GRP W series, the W3 and W6 are both fibreglass, both 6-point harness compatible, and both carry Road and Track approval. The W6 adds side mounting as an option alongside base mount; the W3 is base mount only. If your installation requires side mounting, the W6 is the seat to look at. If base mounting works for your car, the W3 is the straightforward choice.

We have stocked the full Tillett range since 2003. Tell us the car and the installation details and we will confirm whether the W3 works for your setup and which width suits your tunnel.

Additional information

Weight	2.4 kg
Brand	Tillett Racing Seats
Additional Back Frame	No back frame, With back frame
Brackets included	Seat only
Coloured Shell	Black
Construction	Fibreglass seats
Fixing Type	Base Mount
Harness compatibility	6 point compatible
Mechanism Type	Fixed Back Seats
Rolled Edges Option	40cm Width with rolled edges cut off, 44cm with rolled edges left on
Protection Type	No head support
Product Colour	Black
Approval	Road & Track
Seat Cover Options	two Dinamica faux suede covered panels, Without Seat Cover

Tillett seat size guide

Tillett shells are thin single-skin composites with almost no padding, so the internal width is the seat width. Tillett publish it for every model, and the XL and W versions exist for a reason.

How Tillett size their seats

Tillett quote an external and an internal width for each shell. Because there is no foam to squash, your seated hip width has to fit inside the internal figure with 10 to 20 mm to spare. Every B-series shell has an XL, about 30 mm wider, and the W2i and W6 are the wide versions of the W1i and W5, made for drivers over 100 kg or over a 36 inch waist.

Several shells are offered with a rolled edge or a cut edge. The cut edge (B6-40, B7-40, B8-43) loses 30 to 40 mm of external width for narrow cars without changing the inside.

Brackets have to match the shellTillett brackets are angled to match the side of the seat: 8 degrees on the B2, 2 degrees on the B6, B7 and B8. A bracket at the wrong angle stresses the composite. Use a load-spreading spacer of at least 40 mm at every bolt.

Tillett dimensions

From Tillett’s dimension sheets, 2022 to 2025. Widths are the widest point.

Model	External width	Internal width	Height	Weight
B2	44.5 cm	39.5 cm	103 cm	3.2 kg (4.2 with suede panels)
B6	44 cm (40 cut edge)	34 cm	100 cm
B6 XL	plus 3 cm	plus 3 cm	100 cm
B7	44 cm (40 cut edge)	37 cm upper, 34 cm lower	100 cm
B7 XL	47 cm	37 cm
B8	44.5 cm (43 cut edge)	39.5 cm	105 cm
W2i	48 cm	36.5 cm		2.3 kg (4.0 with back frame)
W5	42.5 cm	36 to 38 cm	90 cm
W6	45 cm	41 cm	90 cm

Which Tillett fits you

Model	Waist band	Driver height	Shell	Approval
Competition, FIA 8855-1999
B6 Screamer, B6 Screamer XL	Standard / XL (plus 3 cm)	All heights	GRP or carbon-GRP	FIA 8855-1999
B7	32 to 36	All heights	Epoxy composite	FIA 8855-1999
B7 XL	36 to 40	All heights	Epoxy composite	FIA 8855-1999
C1	32 to 36	All heights	Composite	FIA 8855-1999
Race and track
B6	32 to 36	All heights	GRP or carbon-GRP	Road and track
B6 XL	36 to 40	All heights	GRP or carbon-GRP	Road and track
B2, B8, B9	One size	All heights	Carbon or carbon-GRP	Road and track
B10, B10 XL	Standard / XL	All heights	GRP or carbon-GRP	Road and track
Low back and formula
W1i	Under 100 kg	All heights	GRP or carbon-GRP	Road and track
W2i	Over 100 kg, over 36 inch	All heights	GRP or carbon-GRP	Road and track
W3, W4, W5	One size	All heights	GRP or carbon-GRP	Road and track
W6	Over 100 kg, over 36 inch	All heights	GRP	Road and track

The W-series shells are supplied single skin and need bespoke brackets, or the optional back frame on the W1i and W2i. The B6 comes bottom mount or side mount; the side mount version takes Tillett’s STB, VTB and Elise brackets.

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 Tillett 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 are our product data, checked 6 September 2026. Widths, heights and weights are from Tillett’s dimension sheets dated 2022 to 2025; blanks are where the sheet gives no figure.

Will I fit in this seat?
Send us your height and waist size and we will confirm the fit. The paper dimensions only tell half the story, and our showroom team sit in these seats every day, so you get the honest answer rather than a guess from a chart.

Is this seat FIA approved?
No, this is a road and track day seat rather than a homologated competition seat. For events that require an FIA seat, look at the FIA-approved shells in the range, and ask us if you are unsure what your series needs.

What do I need to fit it to my car?
This is a base-mount seat: it bolts down through its base, the simpler stack for road cars. 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 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.

Tillett seats are custom-made to order

These carbon seats are handcrafted in the UK for each order. We do not stock or display them in the showroom, so everything is a special order placed with Tillett when you buy.

Lead times depend on the model and the options you choose, so ring us before ordering if you are working to a date.

Special order

Because each seat is made for you, our special order terms apply once production has begun.

Tell us your height, weight and the car, and we will confirm the right size and mounting before anything is made. Tillett sizing is specific and worth getting right first time.

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:

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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Choose Klarna at checkout and pick the plan that suits you. The options and amounts for this product are shown below, and they update when you choose an option above.

Use the purchase power check in the Klarna box for a quick, no-obligation look at what you could be approved for before you order.

How it works at GSM SportSeats4u

1Add the product to your basket and go to checkout as normal.
2Select Klarna as your payment method and choose your plan. Klarna gives you a decision in seconds.
3We dispatch straight away. You pay Klarna on the schedule you chose, and any refund goes back through Klarna.

Your questions, answered by Klarna

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.

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.