Customer MNR Vortx with Tillett B6 Carbon Bucket Seats
Customer car, December 2025
We supplied a pair of Tillett B6 carbon bucket seats to a customer building an MNR Vortx, a lightweight kit car made for the track. It was good to see seats like these going into such a focused build, and the carbon B6 suits the car's approach to weight and simplicity.
The customer wanted a seat that would suit the Vortx's compact cockpit, hold them properly on track and add as little weight as possible. After talking through the options, the B6 was the answer. It went in without modifying the interior. Here is why it suits the car, what the B6 is, the measurements, and how the range and the mounting work.
- Tillett B6 in carbon, a pair for an MNR Vortx kit car
- Tillett quote the B6 shell at 4.5kg to 5.1kg
- 40cm wide with the rolled edges cut off, 44cm with them on
- Road and track seat, not FIA homologated; the B6 Screamer is the FIA version
- Side mounted, six point harness compatible, no padding required
- Our listing sizes the standard B6 for a 32 to 36 inch waist
What is on this page
The MNR Vortx and a small cockpit
The MNR Vortx is a purpose-built kit car for track use and fast driving. Its chassis is compact and the cockpit is narrow, so there is very little room for seats. Standard size reclining or bucket seats usually will not go in without serious changes to the interior.
That is why the Tillett B6 range works so well here. The B6 is a slim, bare shell seat for cars with restricted space. In the Vortx it went in without touching the transmission tunnel, the side panels or the bulkhead.
With the cushion panels and harnesses in, the B6 looks as if it was made for the car. The shell sits tight to the tunnel and the side panel.
The Dinamica headrest panel comes as standard, and the back and cushion panels are an option.
Carbon or fibreglass?
The B6 comes in black gloss fibreglass (GRP) or with a carbon finish. It is the same shell, the same shape and the same widths. Tillett quote the B6 at 4.5kg to 5.1kg across the range, and say any seat can vary by up to 10 per cent, so the weight difference between the carbon and the GRP is small.
What the carbon gives you is the look: the carbon weave on show, which suits a car like the Vortx where the interior is part of the build. If saving weight is the real goal, Tillett make lighter seats, such as the B9, and we can talk you through them.
A closer look at the Tillett B6
The B6 is a bare shell. There is no padding required, which sounds austere until you have used one in an open car in the rain. A Dinamica covered headrest panel is included, and you can add back and cushion panels for longer sessions.
The rolled edge is a choice: leave it on and the seat measures 44cm across, or have it cut off and it measures 40cm. The 40cm version is the one for a tight tunnel or a narrow sill. There is also a 40cm ultra low cut option.
- Carbon or GRP shell, around 4.5kg to 5.1kg
- Slim profile for tight cockpits
- Side mounted, with a bottom mount version from Tillett
- Dinamica headrest panel, optional back and cushion panels
- 40cm or 44cm wide depending on the rolled edge
- Six point harness compatible
- Road and track, not FIA homologated
Tillett B6 dimensions
In a cockpit like the Vortx, size is everything. These are Tillett’s measurements for the B6:
| Measurement | Tillett B6 |
|---|---|
| External width at the shoulder | 42.5cm |
| Internal width at the hips | 34cm |
| External width across the base | 35cm |
| Width at the lower mounting point | 40cm with rolled edge cut off, 44cm with it on |
| Height | 81cm |
| Base length | 69.5cm |
| Overall, top of back to front of base | 100cm |
| Hole centres, optional side mount version | 29cm |
| Hole centres, standard bottom mount | 29cm across, 31.5cm front to back |
The narrow shoulders and base are why the B6 clears the tunnel and the door area, and stays clear of gear levers and handbrakes. Our listing sizes the standard B6 for a 32 to 36 inch waist; the B6 XL is 30mm wider inside for bigger drivers.
Garreth's advice is to measure the cockpit at the shoulder and at the base before you order, and to send us those numbers with your waist size.
If the cockpit is tight at the base, the 40cm cut is usually the answer.
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The Tillett B6 range
The standard B6 comes in GRP or carbon, and in standard and XL sizes. The standard B6 suits compact performance cars like the Vortx, Caterham and Lotus Elise, while the XL is for cars with a bit more width and drivers who need it.
For competition that needs a homologated seat, the B6 Screamer is the one. It keeps the same compact shape but carries FIA 8855-1999, and our listing gives it as HANS friendly and six point harness compatible. It comes in GRP and carbon/GRP versions, and in an XL. The Screamer is side mount only. If your class regulations call for an FIA seat, ask your scrutineer and choose the Screamer.
Installation and mounting
The B6 on this car is side mounted, so it needs side mounts to fix it to the floor or the car’s mounting points. Tillett make their own aluminium side mounts, shaped for their shells, and we recommend them for a B6. Tillett also make runner kits for the B6 if you want the seat to slide.
Using Tillett’s own fitting parts keeps the job simple: the mounts are made for the seat’s shape and mounting points, so the time goes into getting the driving position right. As with any seat going into a track car, have the mounting checked by someone who knows the car, and your scrutineer has the final say for competition.
Does the Tillett B6 fit an MNR Vortx?
Yes. Our customer’s pair of B6 carbon seats went into their Vortx without modifying the interior.
Is the Tillett B6 FIA approved?
No. The standard B6 is a road and track seat. The B6 Screamer is the FIA 8855-1999 homologated version.
Is the carbon B6 lighter than the GRP B6?
Only slightly. Tillett quote 4.5kg to 5.1kg across the range, so the carbon is chosen mainly for its finish.
How wide is the Tillett B6?
40cm with the rolled edge cut off, or 44cm with it left on.
How is the Tillett B6 mounted?
This pair was side mounted. Tillett make their own aluminium side mounts, and a bottom mount version of the B6 exists.
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Why it workedA slim shell for a narrow cockpit
The Tillett B6 went into the Vortx with no changes to the interior.
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