Carbon fiber frames

[Granite]

How durable are carbon fiber frames. Particularly when paired with a bafang. 620 motor

 

[mschwett]

How durable are carbon fiber frames. Particularly when paired with a bafang. 620 motor

that’s a little like asking how durable airplanes are.

carbon can be designed and made to be very, very, strong… or it can be either poorly manufactured or specifically designed to prioritize weight and nothing else. in particular, super super light carbon frames can be weak when subjected to external forces off axis, like getting clamped too hard, crashing, etc.

a huge number of bikes, even inexpensive ones, have super durable carbon forks. i know many people with high end full suspension all carbon mountain bikes, nobody has ever broken a frame…. but i would never buy a no-name or very inexpensive carbon frame or fork.

the motor is more an issue for the drivetrain than the frame. a large human standing on the cranks generates more torque than an M620.

 

[Tom@WashDC]

How durable are carbon fiber frames. Particularly when paired with a bafang. 620 motor

I've had a Carbon Fiber mtb with a Bafang Ultra for a year and two months. I ride about 400 miles a month mostly off-road, very hard riding. I've had two excellent wipe-outs on concrete, and a head on collision with a tree this week. Seems to be fine.

 

[m@Robertson]

I have generic carbon fiber frame. I says this because paint came off from performing owner maintenance and sad to discover carbon fiber frame is white.

My High Power competition rifle has a Manners carbon fiber stock and it too is white under the outer surface.

What @mschwett said on the quality of carbon fiber. With Bafang motors, its certainly been done successfully. But its also entirely possible for it to go catastrophically wrong. Carbon fiber has an arguably deserved reputation for 'maybe' when it comes to long-term reliability. You have to decide if you are making the right call on your frame choice.