Brand: Tillett Racing Seats
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The Tillett B5 is a premium competition-style seat designed for dual-purpose street/trackday cars. The fiberglass shell is contoured to leave the shoulders free for unhindered steering, and the low thigh bolsters and flat headrest make it easy to get in and out.
Like all Tillett auto racing seats, the B5 draws on extensive experience in karting, where the seat is a working part of the suspension and must be a perfect fit to the driver. While other brands start with a rectangular shell and fill it with padding to fit the driver, the shell of the B5 is contoured to fit the driver without any excess padding. This allows more contact for better control, while also allowing the driver to sit lower than most other brands.
The B5 is one of the narrowest Tillett seats (just 42cm at the widest part of the rolled lip edge), built for the most cramped cockpits (such as Lotus Elise and Exige).
Two shoulder harness slots and one sub strap slot allow the use of 4-, 5-, or 6-point autocross and racing harness, but instead of lap belt slots the sides are cut down for use with a stock 3-point seat belt as well. The 60° (from horizontal) seatback angle and nearly vertical headrest angle are compatible with a standard Model 20 HANS Device or Simpson Hybrid. Black gelcoat fiberglass shell with a synthetic suede headrest pad. Weighs just 4.5kg (9.9 lb). Designed and manufactured in the UK. Not FIA homologated.
| Tillett B5 Seat Dimensions |
| Dimensions | Centimeters | Inches |
| External Width at Hips | 42cm | 16.54" |
| External Width at Shoulders | 45cm | 17.72" |
| Internal Width at Shoulders | 39cm | 15.35" |
| Internal Width at Waist | 36cm | 14.17" |
| Width Between Mounts | 38cm | 14.96" |
| Depth, Seat Bottom to Bottom of Bucket | 6cm | 2.36" |
| Overall Length, Front Edge to Headrest | 74cm | 29.13" |
| Diagonal Height, front edge to headrest | 106cm | 41.73" |
| Height of Front Edge (from bucket bottom) | 8cm | 3.15" |
| Overall Height | 85cm | 33.5" |
| Height to Shoulders | 54cm | 21.26" |
Note: The seat sides are vertical (not angled as on Tillett B6, B7, B8, B10, and C1), but the 230mm mount hole spacing prevents the use of more common 289mm brackets from competing brands. The B5 requires matching Tillett TBB5 or TBB5T mounting brackets (sold separately):
Tillett TBB5, Standard-Height B5 Mounting Bracket Set (Part No. TIL-TBB5)
Tillett TBB5T, Tall B5 Mounting Bracket Set (Part No. TIL-TBB5T)