Originally Posted by chain
hey not the top tube , the 2 middle tubes .
Sorry. I misunderstood. We had a guy a while back who bought a bike that someone had removed the top tube on and was using the fuel tank and engine for structural support. The frame did indeed fail where we predicted it would. Just didn't want to see you make the same mistake.
Removing the cantilever tubes could still be a gamble. As was mentioned above by LSR, the frame integrity is designed to utilize those tubes for support. Without knowing the wall thickness of the top tube you don't know how much strength you're removing. However we always tell people that, "It's your bike. Build it your way". We can only offer opinions when asked for them.