TRIS4 - TRI/BSA 3 CYLINDER BIG BOX SEAT
Measurements, fitment, and other pictures...
Triumph / BSA Triple Big box seat w/ access hole
Same shape as TRIS3 with large round access hole in top of box section.
Manufacturing Notes:
- We fabricate each fiberglass part to order.
- Fabrication Lead Time UPDATE: Most fiberglass orders will ship within 6 weeks.
- *This part requires CUSTOM installation.
- Cutting, Sanding, Drilling, AND PAINTING likely required.
- Of course, all products require installation once you receive. Common sense is also required.
FAQ's and Reviews
Once again we make every part to order and most often needs custom installation on your part.
Our custom made bodywork is... CUSTOM MADE! So we can make it however you want it.
If you're a previous Airtech customer, our parts are made slightly thicker, 30% heavier with DOUBLE the strength.
If you don't want it thicker, please request "RACE-THIN" in the custom request.
We can also pre-prime or pre-paint your parts for additional charges.
Here's a quick video on how our parts are different, and WHY it's worth it for you.

You might also be looking for...
TRI5B - 67/69 TRI/BSA TAIL OUTSIDE SMOOTH
Triumph / BSA race / cafe seat smooth top
We make this seats in two versions, with a smooth top and a smooth bottom. Hehe…heheheh… he said smooth bottom.
Anyhow, pick the one you like depending on your choice of upholstery. If you’re going for a tip-to-tip upholstery, you want TRI5A. If you’re just upholstering the seat and painting the hump, you want TRI5B.
Fits production frame.
TRI5A - 67/69 TRI/BSA TAIL INSIDE SMOOTH
Triumph / BSA race / cafe seat smooth bottom
We make this seats in two versions, with a smooth top and a smooth bottom. Heheheh… he said smooth bottom.
Anyhow, pick the one you like depending on your choice of upholstery. If you’re going for a tip-to-tip upholstery, you want TRI5A. If you’re just upholstering the seat and painting the hump, you want TRI5B.
Fits production frame.
TRIS3P - TRI/BSA 3-CYL UNDERSEAT ENCLOSURE
Triumph / BSA Triple Big box seat – under seat enclosure
We can bond in this underseat enclosure to create a glove box in the rear.
TRIS3UP - TRI/BSA 3 CYLINDER UPHOLSTERY PAN
Triumph / BSA Triple Big box seat – upholstery pan
TRIS3 - TRI/BSA 3 CYLINDER BIG BOX SEAT 3
Triumph / BSA Triple Big box seat
TRIS1 - TRI/BSA 3 CYLINDER BOX SEAT 1
As seen with the Letterbox fairing above.
Fits Rob North frame.
TRI6 - 67/69 TRI/BSA TWINS FAIRING
Triumph / BSA race fairing
OK, OK… I know the bike says BSA on the side, but Don says it will fit Triumphs too! When speed demon Don Vesco decided to restore his championship winning 67 BSA, he came to us to repair and retool his fairing and seat. We said… ” What the hell is it going to fit?” “Anything” Don replied… So we put it on Triumphs, BSA, Ducatis and even early Yamahas.
Please note: Due to size this fairing ships in an oversize (double) box.
Mounting guideline:
Cut the fairing as shown in the picture, along the dotted line. Spread the lowers, slide the fairing onto the bike, then tuck the lip to the left of the dotted line in the picture underneath the other edge and bolt it together.

(Image 1) TRI4 - 70/71 TRI/BSA LETTERBOX FAIRING
(Image 2) TRI4 - 70/71 TRI/BSA LETTERBOX FAIRING
(Image 3) TRI4 - 70/71 TRI/BSA LETTERBOX FAIRING
(Image 4) TRI4 - 70/71 TRI/BSA LETTERBOX FAIRING
(Image 5) TRI4 - 70/71 TRI/BSA LETTERBOX FAIRING
(Image 6) TRI4 - 70/71 TRI/BSA LETTERBOX FAIRING
(Image 7) TRI4 - 70/71 TRI/BSA LETTERBOX FAIRING
(Image 8) TRI4 - 70/71 TRI/BSA LETTERBOX FAIRING
(Image 9) TRI4 - 70/71 TRI/BSA LETTERBOX FAIRING
(Image 10) TRI4 - 70/71 TRI/BSA LETTERBOX FAIRING
(Image 11) TRI4 - 70/71 TRI/BSA LETTERBOX FAIRING
(Image 12) TRI4 - 70/71 TRI/BSA LETTERBOX FAIRING
(Image 13) TRI4 - 70/71 TRI/BSA LETTERBOX FAIRING
(Image 14) TRI4 - 70/71 TRI/BSA LETTERBOX FAIRING
TRI4 - 70/71 TRI/BSA LETTERBOX FAIRING
Triumph ‘Letterbox’ race fairing
The latest version is the ‘letterbox’ fairing, distinguishable by the oil cooler intake in the front nose. Both of our molds were pulled from clean unchanged originals supplied by Team Obsolete. The detail work and ducting are exactly as produced almost 30 years ago. So if your looking to reproduce an exact replica or just want a cool fairing for your street bike give us a call we can help you out.