namelesspenguin
New Member
Re: XS850 Cafe - Monoshock + Modern Front End
Looks good! Looking forward to updates and pics.
Looks good! Looking forward to updates and pics.
barreto said:Inserting a shameless plug here for the shop and fabrication work.
it is not really what is under the tank, it is the tubes up from the swinger,and of course where they tie in at the top, they have MUCH higher loads than what they were originally designed for nowhbc said:This isn't Luke's first rodeo. Next time I'm at the shop I'll get some pictures of what under the tank.
I understand what you're saying though BSA.
xb33bsa said:subframe is fine these guys are doing an excellent job with fabrication
the concern is the original tubes up to the backbone and the juncture of the bakcbone tubes
they all need strengthening
the basic frame has been weakened considerably and with the monshock the direction of suspension loads has changed at the same time the loading is much higher
basically the frame is a hinge right at the upper shock mount,now, and the downtubes from there to the swinger pivot will not handle the flexing and greatly increased loads of the new design
that is if it gets ridden
barreto said:I understand what you're saying but the XS850 frame is actually quite beefy compared to other bikes and shouldn't have any problem handling the load. I disagree that the frame has been weakened in any way. The only part I removed was the rear subframe, which would not have added very much strength to it's current setup. It could be argued that the tubes going to the old rear shock mounts would have provided some strength in the Fx direction but it would be minimal. The shock is set at 25 degrees, so most of the force is travelling through the two top tubes towards the front of the frame where the steering head is met with five welded supports. I will be adding gussets to the frame where the vertical tubes meet the top tubes, but I don't think they are absolutely necessary.
xb33bsa said:sorry,you don't understand the forces, they don't go to the steering head, they go to the swinger pivot and hence is greatly stressing the vertical tubes and where they connect at each end
unlike the original setup which had only tiny suspension loads on the pivot and those tube connections
considering they will be constantly flexing which is of concern esp at the end joints, yesbarreto said:You think the tensile strength of the two 1" vertical frame tubes are concerning?
xb33bsa said:considering they will be constantly flexing which is of concern esp at the end joints, yes