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Hey all -- so I've got a monster 796 swingarm test-fitted to some old 900ss cases. It slots right in, with the usual shimming of the of the swingarm. The shock mount is offset farther to the left (as you sit on the bike), but nothing impossible with some frame surgery to fabricate an upper shock mount. However, during my self-isolation, I watched a youtube video from the UK, where the builder (s2r swingarm into s4 frame) claims that without some outrigger support connecting the frame to the swingarm pivot, the SSA will/could/might/did crack the rear part of the case, where the swingarm pivots on the engine. The builder of this special talks about it at about the 10minute mark of this video (lovely bike, BTW).
Subsequent research and thinnin' has shown me that:
1. The monsters that came with SSA as standard have a rearset design than helps connect the swingarm pivot to the engine case, specifically by bolting the rearsets to the case and also adding support to the swingarm pivot.

2. On the other hand, if you take a look at the Ducati MH900e, they did not add any outrigger support to their frame -- the steel (heavier!) single sided swingarm simply pivoted in the case, similar to a conventional ducati arm, with seemingly no issues.
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A few well-heeled racers even raced these bikes, no doubt putting additional stresses through the back of the crankcase with higher speeds and grippy tires. Anyone want to weigh in with their thoughts? If you were to fit a 796/1100 swingarm to a 900ss case, would the swingarm and swingarm pivot need additional support? There are a few home-brewed ideas out there without additional case support:

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A few friends have done dozens of swingarm swaps over the past twenty years. They said no issue with standard width crankcases and non-bearing end swingarms. (S2R, MH900E, 696/100, etc) All narrow swingarm pivot engine cases with no bearings within and the bearings in the swingarm attachment ends (SBK, 'Strada, etc) -- add the double-shear for rigidity. I know they bent a few swingarm pivot bolts on the latter (before adding double shear style rearsets) but never the former.

That picture of the Monster frame with S*R swingarm. Is that the SS2R Monster (black/gold) built by Stuart / Flight Cycles about fifteen years ago? He used a 900SS Supersport shock with that upper mount style of bracketry.
 

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sounds like bullshit to me. can't think of a reason how it could be any different to any dual sided swingarm set up in terms of load imparted to the cases.

it would help, especially in a race situation, with overall rigidity. pete smith made outrigger set ups for the 851/888 race bikes out here when he was part of the ducati dealer team.
 
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