Fractured Frame

[Slay]

Kind glad I'm using the SBP rear mount with some extra seat shaft down the seat tube. Makes the front mount just extra....but that looks nasty.

 

[Snax]

Perhaps people should consider doing what I did today, and just look at their frame with the motor running and spinning the rear wheel in the air. The downtube was flexing an alarming amount IMO.

After reading these posts about tubes breaking, I'm strongly considering adding a supporting member between the down tube and seat tube just under the motor. That should make for a considerable reduction of the flexing and fatigue.

 

[wanger]

i think maybe some folks are not mounting these ht engines properly. they need to be completly seated on both mounts. the mount should set flush on the frame as to not make a chisel edge on the frame. also,with the mounts not setting properly you are trying to bend the frame tube at the mount when tightening the bolts. what do you guys think?

SPOT ON good observation
when motor designed there was no suspencion
frames had spacific angles
frames have been redesigned last 15 years due 2 front suspencion the angle between seat tube downtube has changed not allways 70 degrees which is the angle between 2 motor mounts so i believe

 

[Mountainman]

check it while running

Perhaps people should consider doing what I did today, and just look at their frame with the motor running and spinning the rear wheel in the air. The downtube was flexing an alarming amount IMO.

everyone who has this set up -- should do the same

ride that thing