How to find out about my front end

**breakaway** · 12th September 2007, 14:03

It's off another bike. Bike is a '89 CBR400RR, and has USDs on the front, along with a Yamaha master cylinder. I have long since lost contact with the seller of the bike. It's always needed a new front disc, and without knowing where the front end is from, how can I get replacements?

I know they are floating discs, and approx 295mm in diameter. Is that enough information to get a replacement?

**MSTRS:Me** · 12th September 2007, 14:08

Discs will be common between models, possibly even makes.
Last owner is on the bike;s paper? Perhaps you can track him from his name....
Best bet is to remove disc, get all pertinent measurements and then identify like you would a sprocket.

**imdying** · 12th September 2007, 14:33

Show us pics... they're often easy to spot.

As far as old small Hondas go, the only USD front end is the NSR250SP or the RVF400, both of which wouldn't surprise me if they were next to bolt on.

Things like mudguards and calipers can be a bit of a give away (Honda often use Nissin brakes for example), post a pic and we'll play 'spot the front end'

**breakaway** · 12th September 2007, 15:44

According to Spectrum, it's off a RGV250. Henderson MC thinks its off a RVF. But who knows really, I've got different people telling me different things.

Here are some photos:

**imdying** · 12th September 2007, 16:22

Yes, the forks look like 1991 RGV250. Not enough holes in the discs though... :/
http://www.bikepics.com/pictures/944760/

Not sure about the calipers though, generally Suzuki uses Tokico, not Nissin. Arrrgh, it's messing with me, I've seen those calipers before... Should be a similar mount to RVF400 or early blade.

Those discs look to be CBR400 or CBR900, given the number of holes in them, and the design of the carrier. Doesn't look like enough holes for RVF400 discs.
400 -> http://www.bikepics.com/pictures/966369/
900 -> http://w2.bikepics.com/pics/2007%5C0...29769-full.jpg

**MSTRS:Me** · 12th September 2007, 17:22

My old GSXR1100 (1990 - first of the USD) had NSN calipers....
In fact - looks identical (other than size, I'd imagine)

**R6_kid:Me** · 12th September 2007, 17:26

look closely at the discs. Most are stamped with some sort of number on them which is generally the corresponding part number.

**imdying** · 12th September 2007, 17:33

Originally Posted by MSTRS

My old GSXR1100 (1990 - first of the USD) had NSN calipers....
In fact - looks identical (other than size, I'd imagine)

Hey hey! Sure do look pretty close

**klyong82** · 12th September 2007, 19:01

They do look like the 92 to 94 CBR900 disc but the calipers are definitely not off a CBR900. Checked a couple of forums and found that the CBR400 disc were compatible with the earlier CBR900 disc.
Seen this bike and it has a Yamaha brake fluid reservoir. So pretty much it has a hybrid front end from various bikes.

**riffer** · 12th September 2007, 19:40

Yeah, I think MSTRS is spot on. Either its a GSXR1100 or GSXR750 front end, but I'm pretty sure the GSXR750 had the Tokico calipers.

Interestingly, the RF900 has the identical Nissin calipers as well, but not the USD forks. Check my profile pic.

**breakaway** · 12th September 2007, 22:38

Check this out

That's NC23 Triarm that's being wrecked on trademe right now. Discs look identical to mine.

**breakaway** · 12th September 2007, 22:46

Also, is there a way to test at home which (or if both) discs are warped. Prefrably without actually taking off the disc(s)

**vagrant** · 13th September 2007, 01:07

Those are standard 95ish honda discs. They fit them to a couple of models over a couple of years. The carriers are the same, they just varied the disc design by the number of holes or grooves etc. The wheel is also standard honda if you need to do bearings or seals in future. I could not say for sure about the forks, but they do look suzuki to me, any zuki spotters want to confirm that?
Factory replacement discs are blimin expensive. Don't bother with potentially dodgy and worn second hand ones.
Get your self some aftermarket ones.
I have a set of EBC prolites. They work very well, and have an angry hiss when used hard.
EBC also do a wave pattern if that is your thing.
Local pricing was steep, so I got a set from Demontweaks in Wales for 1/2 the quoted NZ price. No duty on bike parts, and the invoice value slid under the GST threshold.

**bimotabob** · 13th September 2007, 07:09

Hi

I agree they are 100% Suzuki probably GSXR750 or 1100 - possibly RGV250 but they would need to be uprated bigtime due to the CBR's much higher weight.
Many Suzuki's (late 80's- early 90') share the common caliper mount (is it 75mm??) so Nissans like that or Tokico are readily obtainable.
Those Honda discs are probably 298mm as they liked to use that size.

Cheers