SC57 CBR 1000RR fork on a RC36-I

[JayRain]

Hi guys!

 

I have a '91 VFR750F RC36-I and I want to install a CBR front fork. Since I like the front to be a bit lower, my bet is to go with a CBR xxx RR. I know the forks of an SC44 CBR928RR and SC50 CBR954RR directly fit my bike, but I would like to install the one of an SC57 CBR1000RR, since it has the nice golden-look. Does anyone know whether that fits an RC36-I like the earlier CBR900RRs?

 

Thanks! Jurjen

[JZH]

Hi Jurjen,

 

I'm fitting VFR1200 triples and VTR1000-SP1 forks to my '93 VFR750FP, mainly for the 35mm offset (OEM is 40mm; the usual CBR/VTR offset is 30mm), but I had to bash in (modify) the front fairing mount to clear the lower triple clamps.  I haven't tried fitting the 30mm offset triples, but they have the same fork spacing, so I'd be surprised if they would fit without modification.  This photo is hard to understand, but the view is looking down the left fork (blue top cap), and I'm trying to show the black lower triple clamp clearing the modified fairing bracket.  I've heated and bashed-in the steel tubing to make it "thinner".  I've also cut down the mounting flange where it attaches to the frame (to allow the forks to turn as far as they can go--which is until they hit the frame!)

 

 

TheStig (in Japan) has fit SP1 forks to his RC36-I, but I think he did not have this problem because he used the "gull arm" SP1 lower triple clamp that does not interfere with the fairing bracket.  I'm aware of people using 929/954 forks and triples on RC36-I models, but I'm not sure if they also encountered clearance issues or not.  Good luck!

 

Ciao,

 

JZH

[JayRain]

Hi Jurjen,
 
I'm fitting VFR1200 triples and VTR1000-SP1 forks to my '93 VFR750FP, mainly for the 35mm offset (OEM is 40mm; the usual CBR/VTR offset is 30mm), but I had to bash in (modify) the front fairing mount to clear the lower triple clamps.  I haven't tried fitting the 30mm offset triples, but they have the same fork spacing, so I'd be surprised if they would fit without modification.  This photo is hard to understand, but the view is looking down the left fork (blue top cap), and I'm trying to show the black lower triple clamp clearing the modified fairing bracket.  I've heated and bashed-in the steel tubing to make it "thinner".  I've also cut down the mounting flange where it attaches to the frame (to allow the forks to turn as far as they can go--which is until they hit the frame!)
 

 
TheStig (in Japan) has fit SP1 forks to his RC36-I, but I think he did not have this problem because he used the "gull arm" SP1 lower triple clamp that does not interfere with the fairing bracket.  I'm aware of people using 929/954 forks and triples on RC36-I models, but I'm not sure if they also encountered clearance issues or not.  Good luck!
 
Ciao,
 
JZH

Thanks for the elaborate explanation JZH!

The SP1 forks are about the same height as the rc36 if I'm not mistaking? I would like to lower the front a bit and the SP1 forks are hard to get...

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[JZH]

The potential problem is not the length of the forks, but the height of the lower triple clamp bolts when the triple clamp is mounted into the frame.  Below are pics of CBR929 and SP1 (RC51) lower triple clamps:

 

 

 

The RC36 fairing bracket is in a fixed position, so if there's a conflict with the triple clamp, either the bracket must be modified or the triple clamp can be swapped for one that doesn't interfere with the fairing bracket.  My VFR1200 lower clamp is flat, like the 929 clamp, but there are only a few bikes with the same 35mm offset, so I didn't have the option of swapping lower triples.  

 

You may not have the same problem--maybe the 5mm difference in offset avoids it?  All of the triples mentioned above hold the forks 214mm apart (as opposed to the RC36's original 192mm fork spacing), so it's a tight fit, and you may lose some "steering lock" (maximum distance the handlebars can be turned from side to side).  You'll have to experiement...

 

This is a picture of Miguel's (TheStig) bike.  I don't recall which triple clamps he's using, unfortunately.

 

 

Ciao,

 

JZH

[JayRain]

The potential problem is not the length of the forks, but the height of the lower triple clamp bolts when the triple clamp is mounted into the frame.  Below are pics of CBR929 and SP1 (RC51) lower triple clamps:
 

 

 
The RC36 fairing bracket is in a fixed position, so if there's a conflict with the triple clamp, either the bracket must be modified or the triple clamp can be swapped for one that doesn't interfere with the fairing bracket.  My VFR1200 lower clamp is flat, like the 929 clamp, but there are only a few bikes with the same 35mm offset, so I didn't have the option of swapping lower triples.  
 
You may not have the same problem--maybe the 5mm difference in offset avoids it?  All of the triples mentioned above hold the forks 214mm apart (as opposed to the RC36's original 192mm fork spacing), so it's a tight fit, and you may lose some "steering lock" (maximum distance the handlebars can be turned from side to side).  You'll have to experiement...
 
This is a picture of Miguel's (TheStig) bike.  I don't recall which triple clamps he's using, unfortunately.
 

 
Ciao,
 
JZH

Thanks JZH, very helpful!

I'm not sure whether the offset makes the difference, I'll have to find out. Or maybe someone knows?

Cheers!

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