Are the USD RS250 forks with or without radial brakes lighter than the RWU NSR ones?
If you're going to argue which is really best there's a whole can of worms in regard to weight / weight distribution / spung/unsprung weight as well as if the additional stiffness of the RS fork is good (or even advisable) on the spindily NSR frame, you'd need to run revalved SP forks and RS250 forks back to back on the track with a damn good rider to choose.
The modern RS250 race bikes are another thing altogeather, designed for and built alongside the forks they are running faster than 500gp laptimes and braking from 170+mph, NSR forks under those sort of forces would certainly flex enough to see the front wheel touch the head if they didn't break under the strain.
There is no doubt taking USD's from a roadbike, especially if the doner bike weighed 170+kg is purely for the pose and probably detrimental to outright performance. It's generally accepted amongst NC30/35 riders that the '35 fork is no better than the '30 one.
Talking of roadbikes they were all once RWU then along the the superbike revolution they went USD, then in pursuit of lightness the 600's went back to RWU and now they are all (I think) USD/radial monsters. Anyone taking bets on then going back to RWU and "normal" brakes to shed a few grams in the future? Especially if Aprilia do make the much rumoured RS250 replacement 450cc twin and it weighs (say) 130kg thus making the GSXR600 look like the heavy lump it is.
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