FZRSupport: the FZROnline Archive

Hey guys, Is there any performance improvement gained from swapping out a 1990 fzr600 square tubing swingarm for the later model Deltabox style? I'm making the R6 shock upgrade and considering swapping out the swingarm as well if there is any benefit. Thoughts?

the original box section swing arm is not as "stiff" as the Deltabox style .
This may actually be better for some riders, me personally i like the stiffer rear end less "macaronni " feel in the corner and more direct feel from the tyre.

If you like that kind of feel go for it if not you can always swap back, You have read my swing arm swap GOTCHA's on my site right ?

Has anyone made any direct riding comparisons between the two swingarms? Does the rectangular swinger suffer from excessive flex (when properly torqued at both ends)? I wonder if the increased (Deltabox) rigidity actually translates into a performance advantage in the case of the FZR600.

They are both made of steel and the Deltabox looks to be a bit heavier. If it were me, I would be hesitant to invest much into swapping swingarms unless it were aluminum. If you really want a performance upgrade, I would opt for an FZR400 swingarm to save some weight and reduce wheelbase, as well.

RD,
+5 on the 400 alloy version being lighter in unsprung weight. As to the ride there are those who believe stiffness is everything (calm down girls) it is not, a rear end that is too stiff can show up weakness in the shock springing & setup that is compensated to some extent by aless rigid rear end.

For an explanation consult "MotoGP technology" by Spalding I believe as to why Rossi amongst others added and subtracted internal webs to the swing arms that resemble the deltabox styling (albeit vaguely)