Gas Motorized Bicycle - 66cc/80cc

The aluminum street bike or bicycle you are considering has the following specifications:

Dimensions: The item dimensions are 43.7 x 7.09 x 21.65 inches (LxWxH).

Gas Frame: The gas frame is suitable for both 2-stroke and 4-stroke engines, and the requirement for the gas frame switch is 10*1.5mm. The rear width of the frame is 135mm.

Headset and Bottom Bracket: The headset size requirement is 1 1/8", and the bottom bracket requirement is 1.732" / 44mm in diameter.

Seatpost and Bottom Bracket: The seatpost requirement is 27.2mm, and the width and inner diameter (including depth of screw) of the bottom bracket is 68mm x 35.4mm / 2.677in x 1.3937in.

Accessories: The gas tank cap is included, but the kickstand is excluded.

Frame Dimensions: The diameter of the downtube is 42mm, the requirement for the seatpost is 27.2mm, and the requirement for the seatpost clamp is 31.8mm.

Safety Considerations: 1. The best safe speed for racing is 35km/h. 2. If the buyer's bike has a quick-release rear wheel, it is suggested that they do not buy the gas frame unless they are a professional.

Overall, this aluminum street bike or bicycle has a variety of specific requirements and considerations that the buyer should be aware of before making a purchase.

product information: