It appears you're interested in specifications for the Triumph Bonneville T120TT. This Sport model is powered by a Twin, four-stroke engine with 649.00 ccm (39.60 cubic inches) of actual displacement before 11.0:1 compression. Fueling is metered via Carburettor. Amal Concentric 30mm allowing this machine to produce its 52.00 HP (38.0 kW) horsepower and torque. According to our records engine heat of the Triumph Bonneville T120TT is moderated by Air. You'll need to get familiar with the 4-speed transmission and pay attention to final drive Chain maintainence. Our best information shows that the front tire size is 3.50-19 and the rear is 4.00-18 . The entire package is supported by the frame, Brazed lug, full-cradle, single downtube. We know you like to go fast or cruise all day, but when you need to stop, you'll be dependant on Expanding brake (drum brake) front brakes and Expanding brake (drum brake) rear brakes. The Triumph Bonneville T120TT was launched in 1967, and we're happy to know (or assume) you've got one in your garage. To help you keep your ride in tip-top shape, consider purchasing an owner or service manual.