Is there any advantage ?
I just purchased a set of 96 RS250 forks w/ triples and need to modify them to fit my NSR. I did it more for the look but wonder is there any advantages.
Need brake calipers and I'm not sure if stock RS or Brembo's would be best, hell I got stock MC21's with 296 rotors and I could become superman if I bit them hard enough.
Would just like to hear other opinons on this subject I know there are people out there with USD on there NSR's. _________________
Jeff, I have the OEM HRC brembo calipers from my RS250. If you are interested, I will email you pic and make an offer. tuanmynsr@yahoo.com _________________ Ducati 996
Honda MC28
RS chassis w/ CR80
76 Honda Z50
I don't know what they are worth, Jamie has them for $349 and more then I want to pay. You tell me what you want. I have already made a offer to the person that sold me the forks for his stock calipers. _________________
Jeff, was wondering where you set your rs250 forks height at. Did you have the fork caps even with the Triple tree? Thankx, any info on setting the RS250 fork height will be appreciated. _________________ Ducati 996
Honda MC28
RS chassis w/ CR80
76 Honda Z50
Waste of money except for the pose value! I had mine proffessionally rebuilt to suit my weight and riding style, and the bike was honestly transformed. Fresh pads and a decent front suspension setup will have you sliding the front tyre both on the brakes and when cranked over.
Well it worked for me... _________________ MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball
I'll be doing 929 conversion with rc51 front wheel. Mine is just for looks After my first short ride on the nsr yesterday i think the forks are fine.[/b]
I dont have USDs on my bike, but I do have 900rr forks and to be honest, they are way too feckin stiff. Even with the stock rates and the preload pulled all the way out. Also with the bigger brakes you can really feel the weight difference.
Jeff, i may be interested in your forks if i cant figure a cheap way to soften these up. _________________ MC21 300R w/SE bits, Rossi 2001
MC28SE Silhouette Repsol
John,
the valving is way too stiff. If you feel confident in pulling them apart, I could help you set up a shimstack that would be alot better. _________________ Paul Herr
'88 FZR4/GSXR/YZF Frankenbike
MY BIKE PICS
Changing brakes only adds poser value. I have the standard brakes, weigh 90kg + suit and can lift the rear any time with only 2 fingers on the brake at the end of a 200kmh straight. And they are easy to control as long as you are not using to many fingers.
4 fingers used in pit the first day of a new season made me crash at 20kmh ( _________________ Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom
hmmmm, i'm not an expert but I would say RS250 forks (not RVF/blade/600RR) to be an upgrade specially if they are the nitride? coated jobbies.
I agree with you dave my forks are more than good enough for what I use them for but if the RWU forks were so much better why are they not fitted to todays RS250s. _________________ MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold
Is this a real question?
Is anyone serious that pukka RS250 race forks are no better than the stockers?
Now I'm not saying that re-valved and sprung stock forks aren't fab - that are. But the real thing with the race kit is the sublime way an adjustment click or two makes a noticable difference.
Granted, I bet less than 10% of the board members [including me] can exploit the advantages, but that wasn't the question! _________________
My stock rotors have a very purpul tint to them and on one certain trip last summer stopped working for a couple turns till they cooled down. The lever was comming all the way to the clip ons. I have sp forks with HRC springs and shuffeled valve stacks and fresh oil and they work great. The USD forks sound like a project!! Jeff I just got my 296 rotors do you have caliper brackets and calipers you want to sell? _________________ 1995 A kit TZ 250
1994 Rothmans NSR 300sp SOLD
1998 RM 250 freestyle/motorcross
1998 Meathanol burning CR 500 AF super retard/motorcross/sand dunes/play bike
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. _________________ Please do not PM me technical questions, if you can't find it on the Forum start a thread
I put rs250 USD forks on my MC21 and being the anal sort I weighed most every little bit:
FRONT SUSPENSION CONVERSION:
RS250 forks: 7 lb. 10.5 oz. each
RS250 upper triple: 14.3 oz.
RS250 lower triple: 3 lb. 1.0 oz.
RS250 axle: 10.9 oz.
RS spacers; 3.1 oz.
NSR taper bearings: 3.9 oz. each
Brembo brakes 1 lb. 6.4 oz. each
RS250 rotors 2 lb.12.0 oz. each
RS250 clip ons 9.1 oz. each
NSR STOCK FRONT END:
SE/SP forks: 7 lb. 11.5 oz. each
NSR upper triple: 1 lb. 3.7 oz.
NSR lower triple: 3 lb. 3.0 oz.
NSR stock bearings: 5.4 oz.
NSR axle: 10.2 oz.
NSR spacers: 3.0 oz.
NSR calipers 2 lb. 4.0 oz. each (no pads)
NSR rotors 2 lb. 5.5 oz. each
NSR clip ons ~15.5 oz. each
The upshot is the rs forks themselves weigh almost exactly the same as the MC21 SE forks, but the whole rs front weighs approx. 2.5 pounds less - the main weight savings is in the Brembo calipers and the rs clip ons.
My 21 forks were basically stock so I can't comment on how re-worked MC21 forks would compare....but compared to stock 21 forks the rs USD jobbies have noticeably better compliance and feel. (For the money and for straight function, i.e, discounting pose value, I can believe the reworked forks is more cost-effective.) But the bigger difference with the rs front is in the braking - mondo stopping power and feel! (I run this with the Brembo radial master cylinder - had it with the stock brakes too, so that is not the difference - something in the combination of calipers or larger rotors, plus stiffer front end). Scott V. rode my bike the other day and nearly de-nutted himself first time he used the brakes. They are a one-finger deal now, but very controllable once you get calibrated to the power. Am I a good enough rider to need any of this? Not a chance! Do I like it? Yeah baby! More than anyone cared to know, but FWIW. _________________ -Jim
'93 MC21
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