They were both 155's and yes my dragon had a timbersled rear,never did figure out why the thing became a trencher, tried all kinds of different shocks and settings, maby Im just stupid? All I know is the stock 5.1 seems to create more lift! Where the PC seem to claw, in a drag race the PC was fasterhad more track speed, hooked up harder, but the first 50 ft my 5.1 was ahead, every time and in the tight trees, where I seem to find myself,I would rather not be trenching,,,,, I guess I just suck as a rider?but now I ride a snow donky,,,, all is now right with the world!