USD vs RWU.

[mistergixer]

Anyone know the relative merits and demerits of them?
Are USD forks superior to RWU, or is it just a fashion thing?
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[Gazdaman]

Up side down and right way up for people wondering what the hell he's on about. And he means forks.

Personally I think USD forks look better, but AFAIK it's a fashion thing.

Gaz

[mrchips]

Not sure, seems USD are just for looks. And they do look well.
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[Mungel]

Isn't it something to do with less unsprung weight?
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Mungel
ZZR600 (dead) - ZX9R (sold) - FZ1S

[mchaggis]

USD forks have less unsprung weight, so you can get better suspension performance, with less mass to wang up and down on the springs. They've plenty of bling factor, but are unneccesary on most machines. A bit like radial brakes.
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[mr.z]

Yes, afaik its unsprung weight, unsprung weight makes a far biger difference to handleing than loping off sub frames e.t.c. might give a better ride as well...

For the difference it makes for everyday rideing though.. i prefer the propper way up, all that shiney gear getting covered in road shat and being hit by the tar covered gravel that councils seem to think is "resurfaceing"

Main reason road bikes has it is tart factor, much like radial brakes, it will knock off .5 seconds off your lap time but make fark all difference on the road (where you can't use 50% of the brakeing on a modern bike...)

/Beaten to it, must type faster..
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[Kickstart]

Hi

Less unsprung weight and they are stiffer.

All the best

Keith
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[DukeRed]

Could be talking crap but doesn't it make it easier to sort out the yokes when there misaligned or something like that. Overheard it from a couple of bikers at the Ball so
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[VFR400UK]

Makes it a twat to change the fork seals!

[gavin]

RWU forks have (relatively) short ally lowers and longer chromed steel uppers, whereras USD's have long ally uppers and short chromed steel lowers. the steel parts have less wall thickness and diameter but being longer and having to support the damping and springing internals, they are heavier than ally uppers (USD forks)

on balance, theres little difference in weight, if anything, the unsprung parts of USD's are slightly heavier than the the same dia unsprung parts of RWU forks.

ALL forks flex at the bottom yoke under braking, so having thicker, bigger diameter tubes at this point ( ie USD forks) drastically reduces flex.

its not about unsprung weight, its about stiffness.

[Vin]

As a point of interest.....ok maybe not but I will say it anyway. When my mate got a RD350 YPVS(RWU) his old man who used to race bikes in the 50's thought it had upside down forks!! So I reckon its a fashion thing
Vin

[DynaMight]

I've been told before on a 125cc forum that USD forks make a sportsbike....
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[Kickstart]

[Vin]

[Klause]

Well I've had both and for me USD's are alot better. Really, really hard to bottom out.
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[2Smoke]

[Silver]

[Klause]

Well I've had them both and I notice the difference. Why do so many people go "blah blah they don't make any difference" to all the new things that are starting to appear on bikes, sounds like your getting old!
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Current bikes: 1960 Triumph 5ta x2, TTR600RE, KTM200EXC, Cagiva Elephant 900ie.

[Silver]

[DynaMight]

I've had 2 bikes with RWU (NC30 and ZX6R) and 2 bikes with USD (RS125 and GSXR750). The ones with RWU's handled better, although thats nothing to do with the actual forks themself but still shows that USD's dont really make a huge difference.
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[Kickstart]

[jayluvmito]