“Dream Big” – World’s Tallest Rideable Motorcycle

- in Bikes

When you are looking for a great attraction to gather crowds at all types of events, few things will capture attention like this monster cycle, The World’s Tallest Ride-able Motorcycle.

Gregory Dunham from the USA has constructed the worlds tallest ride-able motorcycle that is 11’, 3” (3.429 m) tall to the top of handlebars, 20’ 4” (6.187 m) long and weighs 6,500 lb (2.948 tons). It is powered by a 502 cu in (8.2 litre) V8 engine and has tires that are 74 in (1.88 m) tall. This monster needs all 500Hp engine power yoked to 2-speed transmission to make it move. And move it does – Dunham claims the big boy will rumble to a terminal velocity of 65 mph (with an economy of 6 miles per gallon), which must be make for one hell of an interesting sensation.


Dunham built the bike over three years at a cost of $300,000. “After a while, I had to do something in life,” said Greg Dunham, adding I’ve always been an idea guy.

Dunham steers it from a cage below the handlebars as it would be impossible to straddle the bike in a normal riding position. Technically he drives the bike rather than rides the bike.

“People love it” Dunham says. ” Fifteen guys came from out of nowhere to see it. One of the guys said, ‘Build me one!’ People love it! ”

Dunham started building the motorcycle he calls Dream Big.
It wasn’t easy. He twice had problems with the transmission that made him mad enough to want to set the bike on fire. Dunham collected the parts to build the bike from online shops and auto wrecking yards.  He built the bike himself relying on the knowledge gained when he worked in car body and chassis repair at a garage.


Technical Facts

  • Dream Big is powered by a 502 cubic inch V8 with 500 HP/ 600 ft.lbs of torque. Steel heads, ported and polished. Engine blueprinted and balanced. Medium lift roller camshaft, high performance 870 cfm carburettor, H.O. electronic ignition and wires, custom ceramic coated big tube headers attached to 5 inch diameter chrome exhaust, no mufflers!
  • Transmission is automatic with 2 speeds forward and reverse, allheavy dutycomponents including a 2500 rpm stall convertor. Drive shaft driven through one gear box with the final drive using a custom made spooled Dana 60 rear end using all the strongest components to turn the special made rear main axle.
  • Power disc brakes with two 12 inch vented rotors on the front and one 15 inch vented rotor on the rear using two callipers for maximum braking. All brake pads are non asbestos, utilizing the brake material with the best grip.
  • Power steering is provided by a high performance rock crawling steering gear box powered by a heavy duty chrome pump powered by the engine.
  • A separate electric powered hydraulic system powers the rear wheelie bar/ kickstand for its raising and lowering capabilities. The bar is also equipped with solid rubber wheels and hydraulic rams that will push or pull over 10,000 pounds each. The wheelie bar is used in place of the leg support you would ordinarily use on a normal motorcycle and can be raised after the giant bike is moving forward about 20 mph.

Super big bike Dream Big Rock On!…and chill-easy there.

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