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Premium Member
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Pictures please.

It's not unknown to drill new holes in the disc mounting face if it's close enough, or make a mounting dish to fit the discs to.

If you have a good precise measure up, you can sometimes browse part catalogues and figure out what you need. You need to work out:
PCD of mounting bolts,
diameter of mounting bolts (you can open this out if needed)
diameter of disc
"dishing" ie, the height of the disc if you put it flat on a table.

Are you very attached to the XS wheel.. ?
 

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I'm pretty attached to the wheel.
I'd forgotten it's a shafty so you're stuck with it either way!

Without seeing what gaps you have, only general tips can be offered.
 

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Pics would help. Are the rotors centered? Depending on the minimum thickness of the rotors they may be able to be turned down. If not your best bet is an adapter to mate your wheel with the r1 rotors.
 

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nmangano2412
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265 Posts
Discussion Starter #8
Pics would help. Are the rotors centered? Depending on the minimum thickness of the rotors they may be able to be turned down. If not your best bet is an adapter to mate your wheel with the r1 rotors.
The wheel is centered perfectly I centered it with a micrometer. I think I'm just goin to get specs of the r1 ROTORS and see if another bike can swap with mine.
 

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Piston broke
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Make some adaptors. You have quite a small PCD on your discs,R1's have a large PCD so get someone to machine some adaptors and centralise your discs to your calipers at the same time.
 

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nmangano2412
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Discussion Starter #11
Make some adaptors. You have quite a small PCD on your discs,R1's have a large PCD so get someone to machine some adaptors and centralise your discs to your calipers at the same time.
Ya, ill just have to make some adapters. Does anyone have or know of someone who has done this I need some pics.
 

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Post these specs and I'll do some legwork, I'm nice like that.

R1 disc diameter (320mm?)
PCD on your wheel.
Disc centring lip diameter (does it have one?)
Distance between caliper centres.
Width of disc mounting faces on the wheel.

I doubt you're going to find a 1:1 fit though, as your XS disc are very dished which isn't really fashionable on more modern bikes with the diameters you're going to need. Most likely the least you'll need is a more simple flat plate than on that link.

You can search eBay by specs. Here's an example for you, maybe it's even close as it's off a Yam, looks like a similar centre lip size, has 8mm bolts like yours probably does, and is 320mm. You won't find too many discs with a bigger "dish" height than 10mm.
 
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If the wheel face is too narrow, ie the dish isn't high enough, then you can always bring the calipers in (spoke clearance permitting) using washers or if it's more than a couple mm each then get spacers made up.
 

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The friendly Ghost.
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13,169 Posts
Just went through the Metal Gear database and you should have either of two brake disks on your XS 850 stock.

One is a 298mm and the other is a 267mm.

They should both have a 19mm offset, 64mm inner centering lip, 80mm bolt spacing diameter, 6 bolts with 8.5mm diameter each with a width between 7mm and 6mm or 6.5mm.

Your YZF-R1 2004-2005 forks should use a 320mm disk, 0mm offset, 120mm inner lip, 150mm bolt spacing diameter, 6 bolts, 8.5mm each with a width between 4.5mm and 4mm.

Using this information, there are five good candidates with a 320mm disk, 64mm inner lip, 80mm bolt spacing diameter, 8.5mm bolts with varying widths and offsets.


21.015 - 9.5mm offset, 4mm max, 3.5mm min
1986-1987 FZR750 Genesis
1986-1993 FZX750 Fazer
1987-1996 FZR1000
1994-1998 XJR1200
1998 XJR1300
2000 RSV1000 Mille R
1999-2000 RSV1000 Mille SP
2002-2005 Tuono 1000 R
2002-2005 Tuono 1000 Fighter
2000-2005 SL1000 Falco
1995-1997 400 Monster
1992-1997 400 SS
1993-1999 600 Monster
1991-1997 600 SS Supersport
Seems to be used mostly by Ducati on a lot of their 90s models, I can get you more if you want.


21.038 - 10.5mm offset, 5mm max, 4.5mm min
1993-1997 YZF750


21.075 - 10.5mm offset, 5mm max, 4.5mm min
1996 748 S1
2005-2009 990 Superduke
2007-2009 990 Superduke R
2008-2009 1190 RC8
2009 1190 RC8 R


21.104 - 10mm offset, 5mm max, 4.5mm min
2001-2003 916 Monster S4/Foggy
2004-2008 992 ST3
2006-2008 992 ST3 S ABS (Left Side only)
1999-2001 996 Biposto/Monoposto
2003-2006 996 Monster S4R
2001-2004 996 Monster S4
2001 996 S
1999-2000 996 SPS / II
2001-2006 996 ST4S Sports Touring
2003-2006 996 ST4S Sports Touring ABS (Left Side only)


21.141 - 10mm offset, 5mm max, 4.5mm min
2006-2008 992 ST3 S ABS (Right Side only)
2003-2006 996 ST4S Sports Touring ABS (Right Side only)
 

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Premium Member
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Just went through the Metal Gear database and you should have either of two brake disks on your XS 850 stock.

One is a 298mm and the other is a 267mm.

They should both have a 19mm offset, 64mm inner centering lip, 80mm bolt spacing diameter, 6 bolts with 8.5mm diameter each with a width between 7mm and 6mm or 6.5mm.

Your YZF-R1 2004-2005 forks should use a 320mm disk, 0mm offset, 120mm inner lip, 150mm bolt spacing diameter, 6 bolts, 8.5mm each with a width between 4.5mm and 4mm.

Using this information, there are five good candidates with a 320mm disk, 64mm inner lip, 80mm bolt spacing diameter, 8.5mm bolts with varying widths and offsets.


21.015 - 9.5mm offset, 4mm max, 3.5mm min
1986-1987 FZR750 Genesis
1986-1993 FZX750 Fazer
1987-1996 FZR1000
1994-1998 XJR1200
1998 XJR1300
2000 RSV1000 Mille R
1999-2000 RSV1000 Mille SP
2002-2005 Tuono 1000 R
2002-2005 Tuono 1000 Fighter
2000-2005 SL1000 Falco
1995-1997 400 Monster
1992-1997 400 SS
1993-1999 600 Monster
1991-1997 600 SS Supersport
Seems to be used mostly by Ducati on a lot of their 90s models, I can get you more if you want.


21.038 - 10.5mm offset, 5mm max, 4.5mm min
1993-1997 YZF750


21.075 - 10.5mm offset, 5mm max, 4.5mm min
1996 748 S1
2005-2009 990 Superduke
2007-2009 990 Superduke R
2008-2009 1190 RC8
2009 1190 RC8 R


21.104 - 10mm offset, 5mm max, 4.5mm min
2001-2003 916 Monster S4/Foggy
2004-2008 992 ST3
2006-2008 992 ST3 S ABS (Left Side only)
1999-2001 996 Biposto/Monoposto
2003-2006 996 Monster S4R
2001-2004 996 Monster S4
2001 996 S
1999-2000 996 SPS / II
2001-2006 996 ST4S Sports Touring
2003-2006 996 ST4S Sports Touring ABS (Left Side only)


21.141 - 10mm offset, 5mm max, 4.5mm min
2006-2008 992 ST3 S ABS (Right Side only)
2003-2006 996 ST4S Sports Touring ABS (Right Side only)
That's pretty much the same as I said but fleshed out. You ended up with the same set of discs too. Gotta let him work for it a little bit ;)
 
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