Triumph Bonneville and Thruxton Cafe Racer Guide: Models and Builds
The references listed below support the regulatory, safety, and manufacturer statements in this guide. Any dollar figure is an editorial planning estimate based on typical scope, not a quote and not taken from those references, unless a current official price is explicitly cited at that point in the text. Confirm fitment, safety, legality, availability, and current pricing for your exact vehicle before you buy or commission work.
A Triumph Bonneville cafe racer can be a lightly restyled roadster or a substantial custom build. A Thruxton offers a factory cafe-racer starting point, but the earlier twins, 1200 models and Thruxton 400 belong to different parts applications. Identify the motorcycle first, then decide how much of its riding position and bodywork you want to change.
Use the comparisons and documented builds below to prepare a Triumph project brief. The Bonneville builder directory provides a starting list of businesses to investigate for your particular donor and scope.
Choose the Bonneville or Thruxton Generation
A 2008 Triumph Thruxton 900, shown as an earlier Thruxton reference. The Bunker and Indianapolis Bonneville builds described below are separate motorcycles.
2008 Triumph Thruxton 900 by Wikikensei · CC BY 3.0. Resized by Wikimedia; no crop or other editorial edits.
Match the year, market and full model designation to the supplier's application list. These checkpoints help separate the main choices; they are not a parts-interchange chart.
| Starting point | Published distinction | Planning consequence |
|---|---|---|
| Older Bonneville T100 | The 2014 T100 in Bunker's project below has its own documented parts and fabrication work. | Do not order from a later T100 listing using the model name alone. |
| Liquid-cooled Bonneville T100 | Triumph's specification lists a 900cc parallel twin and five-speed gearbox. | Confirm the supported year and seat, control and lighting interfaces. |
| Liquid-cooled Bonneville T120 | Triumph lists a 1200cc parallel twin and six-speed gearbox. | Shared Bonneville styling does not make every T100 component compatible. |
| Thruxton twins | Triumph records a 2004 return and a major 2016 transformation; the later RS is a 1200cc twin. | Distinguish the earlier Thruxton 900 from the 1200, R and RS before buying parts. |
| Speed Twin 900, updated for 2025 | Triumph describes new inverted forks, an aluminum swingarm and a narrower rear frame. | Check seats, brackets and controls against the updated model. |
| Thruxton 400 | A separate 398cc single-cylinder platform with factory clip-ons and rear-set footpegs. | Choose components listed specifically for the 400. |
The model details come from Triumph's T100 specifications, T120 specifications, Thruxton history, RS specifications, 2025 Speed Twin 900 announcement and 400cc family overview.
At review, Triumph's US RS specification page labels both the RS and Final Edition sold out. That website status does not describe every dealer's remaining inventory. The Thruxton 400 announcement, dated December 16, 2025, introduced the MY26 model and said dealership availability would begin in March 2026. Ask a dealer about the exact motorcycle available to you today.
Two Documented Bonneville Cafe-Racer Builds
Bunker Custom Cycles: 2014 T100 Cafe Racer
Bunker's own build account describes a coordinated conversion of a 2014 T100. The work includes an aluminum tail, reshaped rear chassis tubes, a custom solo seat, a CNC-machined upper triple clamp and LSL clip-ons. Bunker also names Hagon rear shocks, Progressive fork springs and a British Customs speedometer bracket.
This is useful evidence of how a seat, tail, instruments and riding position can become one fabrication job. It is not simply a seat-and-bar swap. The builder's reported dyno improvement is specific to its own account and is not a performance target for your bike. Ask your shop to document the proposed parts, mounting work and testing separately.
Triumph Indianapolis: Crossroads Cafe
Triumph's 2025 Classic Custom Contest entry identifies Crossroads Cafe as a Bonneville T120 Black built by Triumph Indianapolis. The description retains the stock T120 engine and lists an undertail exhaust, drag bars, a single seat with a matching cowl and removal of the rear footpegs. The blue-and-gold finish and local imagery connect the design to Indianapolis.
For your brief, the useful comparison is scope: visual identity and passenger requirements can shape a build even when the engine remains stock. A contest entry is evidence of one completed design, not an installation kit or a current booking. Confirm who would perform the work on your motorcycle and which changes the shop proposes to retain.
Both case studies link to the publishers' original photographs. The Thruxton photograph in this guide shows a separate reference motorcycle.
Check the Seat Application Before Designing the Tail
British Customs' Cafe Tuck N Roll seat listing, part BC407.2.076.B, illustrates why the detailed fitment table matters. Although the title says 2016-Up, the table lists Bonneville T100 for 2017–2027 and T120 for 2016–2027. The product description specifies liquid-cooled models.
The page also embeds an installation video labeled for Thruxton 1200/R/RS. That video title does not establish that this Bonneville seat fits a Thruxton. Have the supplier confirm your model, year and part number, and provide the matching instructions. The reviewed listing does not establish fitment for Bunker's older 2014 T100 either.
Ask how the proposed seat works with the latch, rear light, fender, cowl and passenger arrangement. Keep a record of the included hardware and any separate brackets. A product photo cannot show every interface on your own motorcycle.
Plan the Riding Position and Bodywork Together
| Work area | Decide before ordering | Ask the shop to demonstrate |
|---|---|---|
| Bars and foot controls | Rider reach, intended use and preferred posture | A fit session with the proposed seat, bars and foot controls |
| Seat, cowl and rear frame | Solo or passenger use, removable parts and the desired tail length | Mounting details, seat removal and the extent of any structural work |
| Instruments and lighting | Display position, lamp size and visible warning lights | Steering clearance, readable instruments and access to wiring |
| Paint and upholstery | Materials, preparation, colors and outside specialists | Samples and a trial assembly before final finishing |
| Suspension and mechanical work | Donor condition, existing changes and the work actually needed | A written inspection and setup scope for your motorcycle |
Start with the contact points. A low handlebar may change how you want the seat and foot controls positioned. Have the workshop check the combined arrangement before committing to brackets, bodywork or paint. Photographs of another rider's bike are a design reference, not a fit assessment for you.
If you want a fairing, ask where it attaches, how the instruments remain readable and how the assembly comes off for servicing. Decide who coordinates the electrical, fabrication and finishing work when several businesses are involved. The fabrication, upholstery and paint directories can help you define those separate responsibilities.
Build the Budget from the Actual Motorcycle
Begin with an inspection and a list of existing modifications. Ask the workshop to identify condition-related work before allocating the remaining budget to styling. On a used custom, obtain the parts list, service records and information about who made the brackets, wiring and frame changes.
Request separate quote lines for purchased parts, fabrication, controls and wiring, paint or upholstery, mechanical work and final assembly. Include transport, shipping and outside-specialist charges. Agree what happens if trial fitting exposes a missing bracket or an incompatible component.
Use three decision points: approve the design, inspect the fitted assembly, then approve the final finish. Record which original parts should be kept and returned. A reversible change and a shortened rear frame represent different commitments, so the proposal should say exactly what is planned.
The Bunker and Indianapolis accounts do not establish a representative US conversion price. Compare a written build proposal with an actual dealer or used-bike quote for the factory model you would otherwise buy. The motorcycle paint cost guide provides dated finishing-price examples, but those figures do not cover a complete Triumph conversion.
Find Experience with Your Triumph
Browse Bonneville builder profiles, or use the motorcycle search for Thruxton experience. Search results are directory records; ask each business for completed work on the same generation and systems as your donor.
Give potential shops the same editable build brief: full model and year, current condition, intended use, passenger needs, design references, spending limit and timing. Ask who handles final assembly and whether the business currently accepts that scope.
Bonneville and Thruxton Questions
Can a Bonneville be made into a cafe racer without cutting the frame?
Begin by asking for a proposal using the existing mounts and frame. A seat, finish and cockpit plan may meet your aims, but the installer must confirm the complete assembly. A fabricated shortened tail is a separate scope; Bunker's example includes structural changes.
Do T100 and T120 seats always interchange?
Use the specific seat's application list. The reviewed British Customs listing has different starting years for T100 and T120. Confirm the latch, lighting, hardware and passenger arrangement with the supplier before ordering.
Is the Thruxton 400 a smaller version of the Thruxton RS?
They are separate platforms: the 400 uses a single-cylinder engine, while the RS is a 1200cc twin. Shared styling and the Thruxton name do not establish parts compatibility.
Should I buy a Thruxton or convert a Bonneville?
Compare the actual riding position, condition and total quoted cost. A factory cafe-racer model is worth considering when its existing shape meets your brief. A Bonneville conversion makes sense when you can describe the particular changes you want and price them as a complete job.
Sources Checked
Reviewed September 14, 2026. Factory specifications, supplier fitment statements and individual build accounts are attributed to their publishers. The reference photograph has its own credit and license.