Le Billet Fuel Cap Triumph Modern Classic

Le Billet fuel cap for Triumph Modern Classic - Aviation-grade brass or 6061T aluminium, satin finish

The Le Billet fuel cap for Triumph Modern Classic was designed to replace the standard cap with a billet-machined part whose finish is more coherent with the range's aesthetic. On Bonneville, Speed Twin, Scrambler, Street and Thruxton, the original cap remains one of the first elements identified for personalisation, due to its direct visibility on the tank and its immediate impact on the overall look of the motorcycle.

Three finishes are available to fit different aesthetic approaches. The Gold version is machined from aviation-grade brass, a dense and noble material that develops a natural patina over time. The Black and Silver versions are machined from 6061T aluminium, an alloy recognised for its mechanical resistance and durability under motorcycle operating conditions. Each finish goes through a surface treatment that guarantees the longevity of its visual appearance.

The cap integrates a spring valve system connected to three vents distributed on its upper part. This device ensures controlled evacuation of tank pressure and prevents any risk of over-pressure or priming loss, particularly during prolonged parking in sunlight or significant thermal variations. A fuel-resistant O-ring guarantees complete sealing of the assembly.

Grip is facilitated by precise knurling on the flanks of the upper cap, which remains accessible even in wet conditions or when wearing gloves. The lower thread ensures solid retention without excessive tightening force. The 79 mm diameter exactly matches the Triumph original diameter, for a direct replacement fitting without modification to the tank.

For any questions about finish choice or compatibility with your exact model, the FCR Accessoires team is available by phone or email.

The advantages of the Le Billet Fuel Cap | Triumph Modern Classic

Billet machined, three distinct finishes

Gold version in aviation-grade brass for a noble patina over time. Black and Silver versions in 6061T aluminium, an alloy resistant to motorcycle operating conditions. Knurled flanks for reliable grip even with gloves.

Spring valve and fuel-tight sealing

Three upper vents connected to a spring valve to evacuate internal tank pressure. Fuel-resistant O-ring included, sealing guaranteed against leaks and splashes.

Direct fit, 79 mm original diameter

Direct replacement for the original Triumph cap with no modification to the tank. Lower thread for solid retention, installation in seconds without specific tooling.

Frequently asked questions about THE Le Billet Fuel Cap | Triumph Modern Classic

❯ Is this fuel cap compatible with my Triumph Bonneville T120?

Yes. This cap is compatible with the entire Triumph Modern Classic range: Bonneville T100, T120, Bobber, Bobber Black, Speedmaster, Thruxton, Thruxton RS, Street Twin, Street Scrambler, Street Cup, Speed Twin 900, Speed Twin 1200, Scrambler 900, Scrambler 1200 X and Scrambler 1200 XE. Its 79 mm diameter matches the exact Triumph original diameter.

❯ What is the difference between the Gold, Black and Silver finishes?

The Gold finish is machined from aviation-grade brass, a dense material that develops a natural patina over time. It is the most refined finish, favoured on classic café racer or vintage neo-retro builds. The Black and Silver finishes are machined from 6061T aluminium, an alloy recognised for its mechanical resistance. The Black finish integrates with darker builds (Bonneville Bobber Black, black Speed Twin). The Silver finish offers a natural aluminium appearance close to chrome, coherent with lighter Modern Classic builds.

❯ How do I fit the Le Billet fuel cap on a Triumph Bonneville?

Fitting is a direct replacement for the original cap. Simply unscrew the original cap counter-clockwise, remove it and screw the new Le Billet cap in its place. No modification, no specific tooling, no drilling is required. The knurled flanks allow effortless manual tightening. The operation takes less than a minute.

❯ What is a spring-valve cap and why is it important?

A motorcycle fuel tank is subject to significant pressure variations depending on outside temperature and fuel consumption. Without a ventilation system, this pressure can either become too high (risk of fuel pump priming loss or leakage) or too low (risk of tank deformation). The Le Billet cap integrates a spring valve connected to three vents that automatically regulate this pressure, while preventing water, dust and splashes from entering the tank. The O-ring completes the system by guaranteeing total sealing against fuel vapours.

❯ Will the Gold version brass patinate or stay bright over time?

Brass is a living material that naturally develops a patina over time, depending on exposure, humidity and usage frequency. This evolution is sought after by many owners of vintage or café racer builds, as it gives the cap a unique character and its own personality. If you prefer to maintain the original bright appearance, regular maintenance with a dedicated metal product slows or reverses this patina.

❯ Is the cap reversible if I want to sell the motorcycle with the original cap?

Yes. Installation is fully reversible. Simply unscrew the Le Billet cap and refit the original cap. No alteration to the tank is made during fitting. Remember to keep the original cap if you plan a future resale.

French craftsmanship and know-how signed by FCR Accessories

The FCR Accessories Workshop

The artisanal heart of our expertise

All our accessories are imagined, developed and handmade in our FCR Accessories workshop, directly derived from the FCR Original preparation department. As the beating heart of our company, this workshop concentrates all the know-how of our craftsmen and technicians. Each piece is adjusted with precision, designed to combine aesthetics, performance and durability. Nothing is left to chance: from material cutting to final assembly, each step reflects the passion and high standards that have built FCR Accessories' reputation in the high-end motorcycle world.

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FAQ - DELIVERY & ORDERING

What are your shipping times?

All our orders are prepared in our workshop in France.

Shipping is carried out within 24 to 48 working hours after validation of the order.

What are the delivery times?

France : 2 to 4 working days via tracked Colissimo, Mondial Relay or UPS.

Europe : 3 to 7 working days.

International : 5 to 10 working days depending on the destination.

Do you offer order tracking?

Yes, each customer receives a personalized tracking number by email upon shipment.

You can track the progress of your package in real time.

Which carriers do you use?

We work with premium carriers (Colissimo tracking with or without signature, Mondial Relay, UPS or Fedex depending on destination and customer choice) to guarantee speed and security.

Are your products well protected?

Each order is carefully prepared and shipped in secure and discreet packaging , specially designed to protect your parts during transport.

Do you ship internationally?

Yes, we ship our products worldwide. Delivery costs and times vary depending on the destination and are indicated during checkout.

Please note that for deliveries outside the European Union (e.g., United Kingdom, Switzerland, United States, Canada, etc.), local taxes, customs duties, or brokerage fees may be applied by the authorities or the carrier. These fees are not included in the displayed price and remain the responsibility of the customer.

Please consult our FAQ section or our T&Cs to find out more.

Is VAT included in your prices?

Yes, VAT is included for all orders delivered within the European Union.

Business customers can enter their intra-community VAT number when ordering to check whether an exemption is applicable.

For deliveries outside the European Union (e.g., the United Kingdom, Switzerland, the United States, Canada, etc.), local VAT, customs duties, or brokerage fees may be charged upon arrival by the authorities or the carrier. These fees are not included in our prices.

Please consult our FAQ section or our T&Cs to find out more.

What payment methods do you accept?

We accept credit cards (Visa, Mastercard, etc.), PayPal, PayPal Express, Paypal x4 (free), Alma payment in installments, as well as other secure methods available depending on your country.

Why choose FCR Accessoires

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French manufacturing

Designed, manufactured and assembled in Poitiers, France, in our FCR Accessoires workshops, following the finest French craftsmanship standards.

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Plug & play installation

Easy and quick installation, with no cutting or welding required. Each kit includes instructions, mounting hardware and necessary accessories.

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Quality and durability

Premium materials (stainless steel, aluminium, epoxy-coated steel) and flawless finishes ensure exceptional resistance and longevity.

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Developed with passion

Every accessory stems from our FCR Original motorcycle expertise - combining performance, design and innovation.

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Worldwide delivery

Fast and secure worldwide shipping, with careful packaging and full tracking of your order.

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Passionate customer service

Our team of enthusiasts advises and supports you every step of the way, before and after your purchase.

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Exclusive expertise

Parts made with the same precision as our FCR Original motorcycles - created to enhance your machine with authenticity.

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Design and innovation

Our design and engineering teams develop exclusive accessories that combine style, ergonomics and performance.

Le Billet Fuel Cap | Triumph Modern Classic

Le Billet fuel cap for Triumph Modern Classic - Aviation-grade brass or 6061T aluminium, satin finish