The frame from bicycle designer is slightly different from the greenline I think. It seems the crank hole is a little closer to the seat post. I think the seat post is at a different angle. But it has the same dropouts, rear end, etc. I bought one and have loved it. Now it is sitting waiting to get modified for my 4-stroke. The stretches are difficult for the 4-stroke, not much room, and the pedal/chainring are very close and tight. I chose to move down to a 32T sprocket, which gave me back a inch of space, and the bike is easier to start pedaling with all the added weight. Good luck on your build!