A Rare Bridgestone BS175 Rotary Valve Two-Stroke

This is a Bridgestone BS175, an progressively exceptional motorcycle that was amid the world’s most sophisticated two-strokes when it was unveiled back in the 1960s.

The highly developed bikes supplied by Bridgestone irritated the 4 significant Japanese motorcycle marques so a great deal they issued an ultimatum – make tires or bikes but not both equally. Bridgestone acquiesced and closed down their motorcycle factory.

Rapidly Facts – The Bridgestone BS175

  • The Bridgestone Tire Business, Ltd. was launched by Shojiro Ishibashi in the Japanese metropolis of Kurume in 1931. The organization title was derived from his surname Ishibashi – in Japanese “Ishi” usually means Stone and “Bashi” means Bridge.
  • Bridgestone begun generating bicycles in 1949, they then launched their very first motorized bicycle model in 1952, adopted by their to start with motorcycle in 1958.
  • By the 1960s the corporation was developing some of the most subtle two-stroke motorcycles in Japan. The “Big Four” Japanese motorbike manufacturers utilized stress on the business to promote tires or bikes, and the company selected to safeguard their profitable tire company.
  • The Bridgestone BS175 “Dual Twin” is powered by a parallel twin two-stroke with rotary valves. A street variation, scrambler version, and racing variation of the product have been provided.

Stone Bridge, Bridgestone, And Firestone

Even though quite a few assumed the Japanese corporation was named Bridgestone in order to make it sound additional western, and to possibly enchantment to Firestone clients, the name is really a direct translation of the founder’s surname – Shojiro Ishibashi.

Bridgestone BS175 Motorcycle

Image DescriptionThe Bridgestone BS175 was an costly but successful motorbike, the racing variation even received its course at Daytona.

Ishibashi is Japanese for “stone bridge.” The fact that it does seem much more western unquestionably hasn’t harmed product sales in western markets and interestingly in 1988 Bridgestone acquired the Firestone business outright.

Immediately after its founding in 1931 Bridgestone rose to develop into a person of the most significant tire brands in Japan, furnishing a critically vital useful resource for the place as it swiftly produced.

During WWII Bridgestone’s output was just about all consumed by the war energy, in the publish-war many years the organization expanded out into bicycle and motorized bicycle production to fulfill the nationwide need to have for low-cost transportation.

Tires would normally keep on being the primary aim of the enterprise, with a lot of Japanese automakers and bike suppliers deciding on to suit Bridgestone tires to their autos.

Bridgestone BS175 Motorcycle 2

Image DescriptionThe advanced rotary valve two-stroke motor has a displacement of 177cc. Its compact and light-weight body weight style and design involved a 4-speed gearbox.

The export marketplace would continue on to broaden for the organization in lockstep with increasing Japanese automobile and motorcycle exports, and nowadays the corporation has 181 generation services in 24 nations all-around the planet.

The Bridgestone BS175 Twin Twin

In article-WWII Japan when Bridgestone obtained into bicycle and motorized bicycle manufacturing it was almost certainly just a subject of time ahead of they started out building “real” bikes.

The 1st of these appeared in 1958, with a displacement of just 50cc, and it was quickly followed by 60cc, 90cc, 100c, 177cc, and greater products.

All were being two-strokes and thanks to the selecting of a lot of engineers from the defunct motorbike marque Tohatsu, Bridgestone acquired the know-how to make their engines some of the best two-strokes in the earth at the time.

Bridgestone BS175 Motorcycle 4

Image DescriptionMost likely the a person design and style component on the bicycle that could have used additional work was the uncomplicated “BS” emblem for “Bridgestone.”

The Bridgestone BS175 was a person of these state-of-the-art bikes, it was fitted with a parallel two-stroke engine with rotary valves. Its cylinder bores have been chrome plated for very low friction, and it made use of an oil injection technique relatively than relying on the a lot more conventional pre-combine fuel alternative.

The bike was fitted with an uncommon Dual Twin gearbox, a 4-pace transmission with a second “Sport Shift” lever that allowed it to be employed much more like a 5-pace unit.

Other than the engine, the BS175 was a rather standard bike by the criteria of the working day, with a tubular metal frame, drum brakes front and back again, hydraulic forks and twin rear shock absorbers, and there is seating for two.

As a rarer motorbike and a little bit of an historic oddity the motorcycles crafted by Bridgestone and now collectible with fanatics, and they have a tendency to attract crowds at displays, as lots of are unfamiliar with their existence.

Bridgestone BS175 Motorcycle 3

Image DescriptionBridgestone bikes ended up offered via the US importer Rockford Motors in Rockford, Illinois. It is not acknowledged exactly how many were being marketed but we do see them occasionally arrive up for sale.

The Bridgestone BS175 Proven In this article

The Bridgestone BS175 you see below appears to be an unrestored primary case in point that reveals just 3,877 miles on the odometer.

It’s completed in pink with a chrome-trimmed gasoline tank, and red side covers. It is thanks to be marketed by RM Sotheby’s with a price tutorial of $3,000 – $5,000 USD, building it an reasonably priced traditional.

If you’d like to browse far more about it or sign up to bid you can visit the listing listed here.

Bridgestone BS175 Motorcycle 10
Bridgestone BS175 Motorcycle 9
Bridgestone BS175 Motorcycle 8
Bridgestone BS175 Motorcycle 7
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Bridgestone BS175 Motorcycle 1

Pictures courtesy of RM Sotheby’s

Bridgestone BS175 Motorcycle 6

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