Choosing a frame for a motorized bicycle often comes down to two questions: where will the fuel sit, and will the frame hold up under engine vibration. The CDHPower 3.4L brushed aluminum gas frame gives you a direct answer on both. Instead of bolting a separate tank to the top tube, it builds a 3.4L fuel reservoir into the frame itself, and the heavy-duty aluminum construction is designed specifically for 2-cycle engine applications like 48cc, 66cc, and 80cc builds.
Quick verdict
The CDHPower frame is a practical foundation for a PK80/YD100-style motorized bike when you want fuel capacity integrated into the chassis. At USD 159.38, it offers the convenience of a built-in 3.4L tank, 135mm rear width that works with single-speed or multi-speed hubs, and a rear disc brake bracket. The catch is fit: the frame calls for a 27.2mm seatpost, a 1 1/8-inch headset, and a 44mm bottom bracket, so your existing parts need to match those specs.
Who it suits
This frame suits builders who are comfortable matching a frame to a specific parts list. You'll appreciate it if you're assembling a motorized bike with a 2-cycle engine and want the fuel tank out of the way. It also fits riders who plan to use a rear disc brake, since the frame includes a rear disc brake bracket. The 135mm rear spacing is a plus when you have a wheel hub width that matches either a single-speed or geared setup.
What stands out from the listed details
The defining feature is the integrated 3.4L fuel tank. That removes the need for a separate tank and keeps the center of mass lower compared to a typical top-tube or rack-mounted canister. The frame is described as heavy duty and made for gas engine applications, and the brushed aluminum finish gives it a clean look. Dimensions include a 68mm x 35.4mm bottom bracket shell, a 44mm diameter bottom bracket, a 150mm head tube, and a 27.2mm seatpost requirement. The design is aimed at 2-cycle engines in the 48cc/66cc/80cc range.
Meaningful trade-offs
Before ordering, look closely at the fit details. The frame needs a 10*1.5mm switch, a 27.2mm seatpost, and a 1 1/8-inch headset. If your current build uses different specs, you may need to source compatible parts. The description also lists the best safe speed if racing at 35 km/h, so this is not a frame meant for extreme speed runs; plan your gearing and brakes around a sensible cruising pace. The biggest trade-off is that you aren't buying a complete frame setup; the listed specs are specific, and they may not match your current bike parts.
CDHPower Bicycle Gas Frame 3.4L Brushed Aluminum 135mm Motorized PK80/YD100
This is the frame to consider when the integrated fuel tank is your priority. At USD 159.38, you get a 3.4L internal tank, 135mm rear width, and heavy-duty aluminum construction sized for common motorized bike engines. The main limitation is compatibility: it requires specific seatpost, headset, and bottom bracket dimensions, so be prepared to verify those parts before you commit.
Bottom line
The CDHPower 3.4L gas frame makes a focused choice for a motorized bicycle build if you want fuel capacity built into the frame and a rear disc brake mount. At USD 159.38, it's a reasonable investment, but only if your wheel, seatpost, and headset fit the listed specs. Match those details and you have the core of a tidy 48cc-80cc motorized bike.
