Hi, everyone well I guess I might be needing some help.

Well my good friend of mine have been offering me his 08-12 and 14-17 Cbr1000rr USD fork in a good bargain price and I'm kinda wondering if I can fit the Cbr1000rr USD in the NSR mc21? If not I'm planning on buying the Tyga cbr600rr triple clamp conversion kit set if that would help me fit it well my problem is would that solve my fitting problem?

Or does someone here tried fitting a different USD fork?

The most popular usd forks fitted to nsr's seem to be RVF400, NC35, if you go for the CBR1000rr it makes the conversion easier if you use the whole front end, ie forks wheel and spindle, calipers, yolks the lot, saves the hassle of spacers, different wheel bearings etc, iv'e got 04 cbr1000rr front end on an older cbr600 and that's what iv'e got. Good luck with it.
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Proud Father of , 05 ktm 400exc supermoto 2018 honda crf rx supermoto

The problem with with the RVF conversion, Les, is the cost.

Those forks are becoming increasingly harder to source (youngest bikes are almost 25 now, remember!) and with more "classic" Hondas getting restored to original condition/spec, consequently asking prices are rising sharply. It is a nice conversion though, looking very much like it was meant to be there, as long as it's well set up. I rode an MC21 with a straight swap years ago, and it was awful!

A CBR600/1000RR conversion makes more sense in that there are a lot to choose from, and also come with radial caliper mounts, which many people crave these days. But I have to disagree with the "use the whole front-end" part. If you're going to the trouble of fitting different forks, then in my opinion you should make the effort to at least use an NSR wheel so it looks in keeping with the era.

What must be taken into consideration, with any conversion, and in particularly if using 600/1000 forks, is the setup. That suspension is designed to work with far heavier bikes than the NSR250. Also, unless set up properly, in my experience, a 3.5" front wheel really screws up the NSR handling.
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Andy.
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Yeah, your right there Andy, that 3.5 inch wheel would mess up the handling, what was I thinking, personally I don't think there is anything wrong with a well set up standard front on an nsr, or rear come to that.
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Proud Father of , 05 ktm 400exc supermoto 2018 honda crf rx supermoto

Lesviffer750 wrote:The most popular usd forks fitted to nsr's seem to be RVF400, NC35, if you go for the CBR1000rr it makes the conversion easier if you use the whole front end, ie forks wheel and spindle, calipers, yolks the lot, saves the hassle of spacers, different wheel bearings etc, iv'e got 04 cbr1000rr front end on an older cbr600 and that's what iv'e got. Good luck with it.

Hi lesviffer,

Its kinda hard to find a complete USD front end from an N35, I also tried searching cbr600rr all I see is bunch of hard bent damages or some outer damages, well I was running out of luck trying to found a complete one when my friend immediately offered up both the cbr1000rr complete USD fork in a good price since he need to dispose it out so he did offer it to me. Will there be any clearance problem if I just put the whole thing in the nsr or do I need to make some adjustments for a good fit?

Andy wrote:The problem with with the RVF conversion, Les, is the cost.

Those forks are becoming increasingly harder to source (youngest bikes are almost 25 now, remember!) and with more "classic" Hondas getting restored to original condition/spec, consequently asking prices are rising sharply. It is a nice conversion though, looking very much like it was meant to be there, as long as it's well set up. I rode an MC21 with a straight swap years ago, and it was awful!

A CBR600/1000RR conversion makes more sense in that there are a lot to choose from, and also come with radial caliper mounts, which many people crave these days. But I have to disagree with the "use the whole front-end" part. If you're going to the trouble of fitting different forks, then in my opinion you should make the effort to at least use an NSR wheel so it looks in keeping with the era.

What must be taken into consideration, with any conversion, and in particularly if using 600/1000 forks, is the setup. That suspension is designed to work with far heavier bikes than the NSR250. Also, unless set up properly, in my experience, a 3.5" front wheel really screws up the NSR handling.

Hi andy,

I'm currently making my project bike look like a retro/modern design bike. Well I have to agree that the Nc35 are being restored up so finding a spare up for grab in the market is quite difficult even finding some cbr600rr fork end in a good conditions is quite hard to find too aswell. Well its kinda hard to resist my friend offer since its a package deal for the two complete front end of an cbr1000rr.

I'd make sure to re-dial the fork up to my weight for good, is it advisable or good to just buy and use the tyga cbr600rr fork clamp rather than using the stock oem clamp on the oem usd?

Most USD forks are heavier than the standard NSR250 forks, so any weight saving you can make is worth it if you are not concerned with an OEM look.

Bear in mind the NSR was never designed for USD forks of any description, and there's very little clearance to the radiator. You will need to fabricate a steering stop to prevent the forks damaging the radiator, or at the very least buy a steering restrictor, which TYGA also sells. (I'm not sure the TYGA part restricts the steering enough though... it's not what it's designed for, so you will need to ask them.)
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Andy.
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Andy wrote:Most USD forks are heavier than the standard NSR250 forks, so any weight saving you can make is worth it if you are not concerned with an OEM look.

Bear in mind the NSR was never designed for USD forks of any description, and there's very little clearance to the radiator. You will need to fabricate a steering stop to prevent the forks damaging the radiator, or at the very least buy a steering restrictor, which TYGA also sells. (I'm not sure the TYGA part restricts the steering enough though... it's not what it's designed for, so you will need to ask them.)

Hi andy, thanks for the reply.

I got my oem fork rebuild properly if ever I want to return it back to the oem stock I can just reinstall the stock one. I'd be show casing my nsr to any motorcycle show that my crew can grab, from retro motorcycle to modern day design which prompted me to find a USD fork immediately while doing some research to what suit best well luck isn't on my side since I couldn't find any nc35 or cbr600rr fork ended up getting the 1000rr fork offer which I've only paid for $400 for an 08-12 1000rr fork and the 14-17 1000rr if I remember it correctly.

If ever the "Steering stopper" won't work with tyga I'll just look for someone who'll fabricate a steering stopper and weld it up for good.

Actually, I just looked, and the TYGA bottom clamp has adjustable lock-stops.
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Andy.
NSR-WORLD.COM

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Andy wrote:Actually, I just looked, and the TYGA bottom clamp has adjustable lock-stops.

So it means I do not need to refabricate/weld a steering lock?

Lesviffer750 wrote:Yeah, your right there Andy, that 3.5 inch wheel would mess up the handling, what was I thinking, personally I don't think there is anything wrong with a well set up standard front on an nsr, or rear come to that.

Amen.