Deciding on a frame for a motorized bicycle build usually comes down to one question: will the engine mount cleanly and will the tank fit without cluttering the bike? The CDHPower Bicycle Gas Frame 3.4L Brushed Aluminum 135mm Motorized PK80/YD100 addresses that directly with a built-in 3.4L gas tank and heavy-duty construction made for gas engine applications.
Quick verdict
At USD 159.38, this frame is designed for 2-cycle engines in the 48cc, 66cc, and 80cc range. The 135mm rear width means it can work with single-speed or multi-speed setups, and the rear disc brake bracket gives you a clear mounting point for a disc brake. If you're building a motorized bike and want the tank integrated into the frame, this is a practical pick.
Who it suits
This frame suits builders who want a clean, integrated fuel tank rather than a separate tank strapped to the top tube. It's also aimed at riders using PK80 or YD100 style engines, as the title suggests. The included 135mm rear spacing is common for many bicycle hubs, so it can fit a typical rear wheel. Seatpost diameter is 27.2mm and the head tube is 150mm with a 1 1/8" headset requirement - worth checking against your existing fork and seatpost.
Product notes
CDHPower Bicycle Gas Frame 3.4L Brushed Aluminum 135mm Motorized PK80/YD100
The built-in 3.4L tank is the headliner. Instead of mounting a separate tank, you get a brushed aluminum frame that carries the fuel inside the frame. The frame also includes a rear disc brake bracket, which is useful if you prefer disc braking for a motorized build. The bottom bracket shell is listed at 68mm x 35.4mm, a common size for many cranksets. The frame is designed specifically for 2-cycle engines in the 48cc-80cc range, so it aligns with popular motor kits.
Meaningful trade-offs
The listed safe racing speed of 35km/h is a spec to respect. The frame is built heavy duty, but that heavy-duty construction also adds weight. The requirement for a 27.2mm seatpost means you may need a shim if your existing seatpost is a different diameter. Also, the headset is 1 1/8", so make sure your fork and headset match. The price at USD 159.38 is the frame only - you'll need to bring your own wheels, fork, and engine kit.
Bottom line
If you're after a motorized bicycle frame with a built-in gas tank and 135mm rear spacing, the CDHPower Bicycle Gas Frame 3.4L is a solid candidate. It's built for 48cc, 66cc, and 80cc engines, has a rear disc brake bracket, and comes as a new frame. Make sure your seatpost and headset match the 27.2mm seatpost and 1 1/8" headset requirements, and you'll have a strong base for your build.
