Let’s go vintage racing: this 1966 Bridgestone 175cc 2-stroke twin is the perfect tool for entry into the competitive 175 Vintage class in AHRMA racing, which has the largest number of entries and the most potential for fun. The Bridgestone has been fully developed with tons of trick racing parts, and it’s ready to start a new season; don’t be like the rest of the pack, ride a Bridgestone. And yes, Bridgestone is the world’s largest tire producer today, and its products are OEM spec on most Japanese cars and motorcycles, just as they were in the early 1950s, when this tire company decided to try building motorcycles too.
It was a tricky situation, supplying tires to Honda, Yamaha, Suzuki and Kawasaki for their new machines, all the while building a bike to compete with them, which is what ultimately led Bridgestone to quit building motorcycles in 1971. The Bridgestone Tire Co. was founded in 1931 by Soichiro Ishibashi, who decided to help fill the demand for postwar transport by adding a small motor to the bicycles Bridgestone started producing in 1946. Twin-cylinder Bridgestones of a far more advanced specification were an ironic result of a bad Japanese economy, when Bridgestone, with a stable income from global tire sales, hired engineers from bankrupt rivals Lilac and Tohatsu. This 1966 Bridgestone 175 Dual Twin is exactly the type of machine raced in the period by privateer owners, but better. The frame has been lightened, it has race-spec Ceriani forks with magnesium triple clamps, magnesium Menani brakes, alloy rims, adjustable DeCarbon rear shocks, Magura racing levers, an Ohlins steering damper and nickel-silicon-carbide-plated cylinder bores.
The cylinder head has been milled for higher compression, the crankshaft is lightened and balanced, the gearbox is a 5-speed Nova racing conversion and the cylinder ports are enlarged and run modified disc valves. All of this breathes through 22mm Mikuni carbs, is fired by a DynaTek electronic ignition and exits through custom expansion chambers. If you’re looking for a 175 Vintage class racer, you’d be hard pressed to find a better prepared machine that looks this good.
- Lightened frame
- Fully adjustable Ceriani-style forks
- Magnesium triple clamps
- Fully adjustable de Carbon-type rear shocks
- Menani upgraded brakes
- Custom laced Excel rims w/ SS spokes and nipples
- Bridgestone Battlax BT-39 tires
- Magura levers
- Ohlins steering damper
- Nickel silicon carbide plated cylinders
- Milled cylinder heads
- Lightened and balanced piston/crankshaft assembly
- 5 speed Nova Racing transmission conversion
- Enlarged cylinder ports
- Modified Rotary disk valves
- 22mm Mikuni carburetors
- DynaTek electronic ignition
- Custom exhausts
Report by mecum.com