RGV250 forks on SV650? - SV650.org

18-12-04, 11:13 AM

Anyone messed about with RGV250 forks on an SV? The fork diameter is 41mm - same as SV's. Might be able to use same discs and calipers though I believe wheel is different size. Anyone have further info? This could work out a much better option than gixxer forks.

18-12-04, 11:18 AM

do you know if thew distance between the forks is the same? if it is then just use the complete front end

18-12-04, 11:21 AM

Ratty · 18-12-04, 12:07 PM

The forks you show are USD and therefore it’s not the 41 mm stanchions that are clamped by the yolks. I doubt that the top of the fork legs is reduced back to 41 mm although there does seem to be some reduction. You would have to see if the RG yolks are compatible with the SV headstock.

18-12-04, 01:24 PM

Yeah fit those they're only 720mm long, against the SV's 780mm. The steering geometry will be sharp as a razor. Budget for steering damper

RGV runs a 110 tyre, discs are reputed to be the same, spindle is 17mm same as SV. Fork tops are once again +/-50mm or so so you'd need the yokes.

19-12-04, 11:35 AM

Here's something interesting... http://www.sv650.org/sv_dec02.htm. Search: rgv250

It would appear that the upper rgv250 part will fit the sv650 yolks? I'm trying to find the exact diameters now. I take it the stanction (41mm) is the inner shiny chrome part. Dunno what the name of the other part (lower sv, upper gold on rgv) is called.

Can anyone tell me the SV650 yolk size? Is there any defo info on the RGV yolk size? I'm searching the .net to no avail...

19-12-04, 01:50 PM

The rgv forks are sprung very soft even for a light bike like the rgv they could do with a harder spring.
I have an rgv and have fitted the forks from a ZX636 to it. It uses a set of yokes I have made for the rgv but required the discs to be spaced a little further apart (4mm a side) I could have moved the forks closer together to compensate for this but I already had the jigs and programs written for the standard offsets of the rgv.
I have been told the discs are the same for the sv650, bandit 600, gsxr400(GK76) and the rgv but this is only heresay and looking through replacement disc codes in catalogues.
If you want to fit a wider rim to rgv forks use the gsxr400 GK76 model as this is a common swap on the rgv to enable the use of a 120 section front tyre.
Here is my front end off the bike:

19-12-04, 02:31 PM

I'm starting to figure the easiest option to be two new yokes made to fit. I found out the RGV uses yokes of 50mm.

Sticking with the SV's 120 rim isn't neccessarily required as my front has been buckled slightly, and the 120's overkill anyway, though I'm told the RGV uses a cast iron wheel unlike the SV's alu. Actually my front tyre's recent so maybes I'll do just as you say.

Lovely piece of engineering you have there. Are those ZX636 calipers standard?

19-12-04, 07:52 PM

The top diameter is 50mm diameter and the bottom one is 52mm diameter. If the distance of the forks is the same you should be able to use the rgv yokes, but you will have to check that the offset of the calipers is the same. The other thing to check is the spindle size is the same (17mm on the rgv with a 16x1.5mm thread on it) and the length of the forks.
The RGV wheel is quite heavy but I cant think of any bike that would have a cast iron wheel!
As the SV yokes are RWU, they will not be of any use with an set of USD forks they will have too small a diameter.
The calipers are standard for the ZX636 B1 model.

19-12-04, 08:20 PM

Oh I seen an advert where the wheel was advertised as cast iron!

It would be possible to make a lower yolk but the upper would prove much more difficult. Going off your model would it not be possible to cut the SV stanction at the top to lower yolk, feed the 50mm upper part of RGV into new yolk and then slot the SV stanction into this (perfect fit as SV's is 41mm)?

This might give less strength but wouldn't be too bad I imagine. It would be a perfect fit and still clamped top and bottom. It would also give an additional 2 inches on height which is needed for RGV's forks are shorter.

18-12-04, 11:13 AM	#1
snoopy Guest Posts: n/a	RGV250 forks on SV650? Anyone messed about with RGV250 forks on an SV? The fork diameter is 41mm - same as SV's. Might be able to use same discs and calipers though I believe wheel is different size. Anyone have further info? This could work out a much better option than gixxer forks.

18-12-04, 12:07 PM	#4
Ratty Member Join Date: Feb 2004 Location: Stockport Posts: 597	The forks you show are USD and therefore it’s not the 41 mm stanchions that are clamped by the yolks. I doubt that the top of the fork legs is reduced back to 41 mm although there does seem to be some reduction. You would have to see if the RG yolks are compatible with the SV headstock. __________________ "I can see Paradise by the SV's light" TCX Competizione S boots saved my foot .

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18-12-04, 11:18 AM	#2
Itching 2 go Guest Posts: n/a	do you know if thew distance between the forks is the same? if it is then just use the complete front end

18-12-04, 01:24 PM	#5
BURNER Guest Posts: n/a	Yeah fit those they're only 720mm long, against the SV's 780mm. The steering geometry will be sharp as a razor. Budget for steering damper RGV runs a 110 tyre, discs are reputed to be the same, spindle is 17mm same as SV. Fork tops are once again +/-50mm or so so you'd need the yokes.

19-12-04, 11:35 AM	#6
snoopy Guest Posts: n/a	Here's something interesting... http://www.sv650.org/sv_dec02.htm. Search: rgv250 It would appear that the upper rgv250 part will fit the sv650 yolks? I'm trying to find the exact diameters now. I take it the stanction (41mm) is the inner shiny chrome part. Dunno what the name of the other part (lower sv, upper gold on rgv) is called. Can anyone tell me the SV650 yolk size? Is there any defo info on the RGV yolk size? I'm searching the .net to no avail...

19-12-04, 01:50 PM	#7
gixerboy1 Guest Posts: n/a	The rgv forks are sprung very soft even for a light bike like the rgv they could do with a harder spring. I have an rgv and have fitted the forks from a ZX636 to it. It uses a set of yokes I have made for the rgv but required the discs to be spaced a little further apart (4mm a side) I could have moved the forks closer together to compensate for this but I already had the jigs and programs written for the standard offsets of the rgv. I have been told the discs are the same for the sv650, bandit 600, gsxr400(GK76) and the rgv but this is only heresay and looking through replacement disc codes in catalogues. If you want to fit a wider rim to rgv forks use the gsxr400 GK76 model as this is a common swap on the rgv to enable the use of a 120 section front tyre. Here is my front end off the bike:

19-12-04, 02:31 PM	#8
snoopy Guest Posts: n/a	I'm starting to figure the easiest option to be two new yokes made to fit. I found out the RGV uses yokes of 50mm. Sticking with the SV's 120 rim isn't neccessarily required as my front has been buckled slightly, and the 120's overkill anyway, though I'm told the RGV uses a cast iron wheel unlike the SV's alu. Actually my front tyre's recent so maybes I'll do just as you say. Lovely piece of engineering you have there. Are those ZX636 calipers standard?

19-12-04, 07:52 PM	#9
gixerboy1 Guest Posts: n/a	The top diameter is 50mm diameter and the bottom one is 52mm diameter. If the distance of the forks is the same you should be able to use the rgv yokes, but you will have to check that the offset of the calipers is the same. The other thing to check is the spindle size is the same (17mm on the rgv with a 16x1.5mm thread on it) and the length of the forks. The RGV wheel is quite heavy but I cant think of any bike that would have a cast iron wheel! As the SV yokes are RWU, they will not be of any use with an set of USD forks they will have too small a diameter. The calipers are standard for the ZX636 B1 model.

19-12-04, 08:20 PM	#10
snoopy Guest Posts: n/a	Oh I seen an advert where the wheel was advertised as cast iron! It would be possible to make a lower yolk but the upper would prove much more difficult. Going off your model would it not be possible to cut the SV stanction at the top to lower yolk, feed the 50mm upper part of RGV into new yolk and then slot the SV stanction into this (perfect fit as SV's is 41mm)? This might give less strength but wouldn't be too bad I imagine. It would be a perfect fit and still clamped top and bottom. It would also give an additional 2 inches on height which is needed for RGV's forks are shorter.