Triumph Bonneville Specs
March 15, 2013 - San Diego, CA
The Triumph Bonneville motorcycle has a long history spanning three production runs over more than 50 years. The first run was started in 1959 by the now defunct Triumph Engineering in Meriden, West Midlands, England. It lasted until 1983 and was followed by a short second run from 1985 to 1988. The third run was started in 2001 by the Triumph Motorcycles company in Hinckley, Leicestershire.
The original Triumph Bonneville was especially popular in its early years of introduction, for its peak performance compared with other available motorcycles at the time. Triumph Bonneville bikes were named after the Bonneville Salt Flats in Utah where Triumph and other motorcycle companies used to attempt to break motorcycle speed records.
All models of the Triumph Bonneville share a parallel-twin four-stroke engine configuration. The original Triumph Bonneville specs were a 650cc parallel-twin motorcycle while the current version (in production since 2001) has a 790cc parallel-twin engine.
T120 Triumph Bonneville Specs
The original Triumph Bonneville introduced in 1959 was a 650cc parallel-twin motorcycle manufactured by the Triumph Engineering company. Between 1959 and 1974 it was manufactured by Norton Villiers Triumph. The T120 was originally based on the Triumph Engineering Company's Triumph Tiger T110 and was outfitted with the Tiger's optional twin 1 3/16in Amal monobloc carburetors along with the Tiger's high-performance inlet camshaft.
The T120 Triumph Bonneville was initially manufactured with a pre-unit construction engine which allowed the motorcycle to easily achieve 115 mph without further modification. In 1963 a unit construction engine was introduced which was stiffer and more compact, with additional bracing at the steering head and swing arm. Furthermore, the steering angle was altered and improved forks were fitted a couple of years later, which, together with the increased stiffness of the engine enabled overall performance to match that of the Triumph Bonneville's main rivals. Late model T120s were equipped with a new engine frame which contained the engine oil instead of using a separate tank; this became known as the oil in frame version.
T140 Triumph Bonneville Specs
In the early 1970s the 650cc capacity T120 Triumph Bonneville, often known as the duplex frame model, was replaced by the T140 Bonneville. The T140 was basically the same machine as the T120 but with a 750cc engine. Additionally, the oil in frame: engine of the T120 was replaced in the T140, along with a five-speed gearbox option and indicators.
By1975, the gearchange lever had been moved from the right side to the left side to comply with new regulations mandated for the American market and the drum brakes were replaced with disc brakes. Several T140 models followed, featuring various engine modifications and refinements including a new electric start to replace the kick-start.
Although domestically the T140 Bonneville remained the best-selling 750cc motorcycle against more sophisticated Japanese and Italian opposition, sales abroad suffered greatly in the late 1970s and early 1980s. Production of the Triumph Bonneville halted with the closure of the Meriden works in 1983.
Triumph Motorcycles was soon acquired by businessman John Bloor, who licensed a company called Racing Spares in Devon, run by Les Harris to manufacture the T140 Triumph Bonneville motorcycle. These continuation motorcycles, which are known as the "Devon Bonnevilles," didn't reach the market until 1985, and were only sold until 1988. They were not sold in the U.S.
The New Triumph Bonneville
A completely new Triumph Bonneville specs were introduced to the market in 2001 by John Bloor's Triumph Motorcycles Ltd. The new "Bonnie" strongly resembles the earlier models of the T120 Bonneville in terms of style and basic configuration, but with totally updated engineering. The new version was given a 790cc parallel-twin engine, with the up-spec T100 receiving an 865cc engine.
From 2007 on, all Bonnevilles received the 865 cc engine, and from 2008, all Bonneville engines had their carburetors replaced with electronic fuel injection (EFI) to comply with increasingly strict emissions requirements. Dummy carburetors were added to the 2009 models to retain the original vintage styling of previous years. To accommodate the EFI pump all 2008 models on all received a reshaped, bigger tank.
Originally built exclusively in Hinckley, England, some Bonneville models are now produced at the company's Thailand manufacturing facility, which also makes components and accessories for various Triumph bikes.
In 2006, Triumph debuted the "Sixty-8" line of Bonneville motorcycle accessories, offering vintage and modern-style items including cam covers, seats, seat covers, sprocket covers, gas tank covers, tank badges, panniers, and other items to allow Bonneville owners the opportunity to customize their Triumph motorcycles for considerably less cost than traditional customizations.
If you are interested in other motorcycle accessories or apparel, BikeBandit has you covered with motorcycle jackets, goggles, helmets, motorcycle gloves, and much more. We also have aftermarket motorcycle parts and OEM Triumph motorcycle parts and many other bikes.