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GSXR Fork Information / Permutations

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528K views 1.1K replies 197 participants last post by  Bremsen  
#1 · (Edited by Moderator)
Here is a summary of the different models of USD Radial forks used on the various Suzuki models.
Hopefully, this will concentrate all the dimensional information on the most popular SV/GSXR fork conversion possible configurations.

Let's start with the matrices for the dimensions of the various fork models:

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Acknowledgments to Sam over at TL zone for initiating the primary chart creation and to all those who provided the data for it.

This excellent illustration courtesy of jeff721 will help indicate to what the measurements in the chart refer:

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Of course, there are the non-radial USDs used on the 01-03 750 and 01-02 1000 but the Radial versions seem to be the most popular, so that is the focus of this post.

So - looking at the primary area of interest for GSXR Radial Forks:

2003/04 1000
Gold/black inner tubes; gold calipers
300mm rotors.
850 springs
32mm offset; 54mm lower clamp
Right offset ignition top clamp, 28mm bore

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2005/06 1000
Bronze/black inners; black calipers
310mm rotors
950 springs
30mm offset, 54mm lower clamp
Center ignition top clamp, 28mm bore

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2004/05 600/750 (same)
gold/chrome legs, gold calipers
300mm rotors
850 springs
30mm offset, 54mm lower clamp
Right offset ignition top clamp, 25mm bore

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2006+ 600
gold/ chrome leg, black calipers
310mm rotors
900 springs
30mm offset, 53mm lower clamp
Left offset ignition top clamp, 28mm bore

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2006+ 750
black/ bronze leg
310mm rotors
1000 springs
30mm offset, 53mm lower clamp
Left offset ignition top clamp, 28mm bore

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Calipers:

03/04 1000 and 04/05 600/750 (fit 300mm rotors std)

* The 03 1000 calipers are 4 pads per caliper - look the same as the two-pad variant
No interchangeable re pads however

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All other GSXR models

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Yamaha Monoblock (R6)

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Caliper/Rotor Matrix:

Calipers can be utilized from all the models above, by using spacers* per this matrix.
* Note that although for some sizes it says N/A, this means the combo would be too tall;
however, you could actually machine the caliper (or fork leg stanchion) as opposed to a spacer

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Triple Clamps:

You can mix & match a bit here:
The ideal top clamp I believe would be the 04/05 600/750 clamp
This has ignition offset to the right (same as SV and more conducive to the Vee shape of the front of the speedo for naked)
It has a 30mm offset and a 25mm bore.
Direct fit on 04/05 l600/750 lower triple clamp/forks
To fit on 06+ 600/750 forks/lower triple, bore stem hole to 28mm
To fit on 05/06 1000 bottom triple, bore stem to 28mm

If you have no access to machining, then the 05-06 1000 top clamp will fit directly on the 06+ 600/750 steering stem. This clamp has ignition 'straight ahead. The steering lock WILL lock, albeit with the wheel straight ahead, as opposed to the conventional full left position.

06+ 600/750 top clamps obviously 'fit' their own forks/bottom triple, however, the ignition is offset to the left; it requires some machining of the ignition module to avoid interference with the frame on the left side and the steering lock will not function without drilling frame. This makes it a less ideal choice.

Bottom clamp:
03/04 1000 has 32mm offset, 54mm bottom fork dia, and 25mm stem
05/06 1000 has 30mm offset 54mm bottom fork dia and 28mm stem
04/05 600/750 has 30mm offset, 54mm bottom fork dia, and 25mm stem
06+ 600/750 has a 30mm offset, 53mm bottom fork dia, and 28mm stem

Note that 06+600/750 forks are 53mm at the bottom clamp diameter - the others above are 54mm; so consider that as you wish to mix/match bottom triples & forks.

Axles:

The wheels are comparable fitment for all 01+ GSXR;
However, the axles change with the fork generations;

For the first group of forks per the caliper table above (03-04 1000 or 04-05 600/750)
uses an axle & collar nut (same as SV1K actually)
Note that there is no additional wheel/axle spacer required.

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For the second group of forks (05+ 1000 or 06+ 600/750)
the axle has a threaded bolt, rather than a collar nut, with a separate spacer that goes between the wheel & right fork leg.

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Steering Bearings:

All GSXR forks in the range above have 30/55/17 top & bottom bearings.
All Gen 2 SV650 and SV1K are the same sizes also
Gen 1 SV650 is the same bottom bearing but requires a special top bearing from TWF Racing.

Wheels:

All GSXR wheels after SRAD will fit any GSXR forks described above
The rotors change sizes (and fitment) however

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Mix n Match Capability for Wheels/Rotors:

01-04 1000 and 01-05 600/750 and SV1K all are the same wheel dimensionally;
Will take 300mm rotors from 03-04 1000, 04-05 600/750;
Will take 310mm rotors from SV1K;
Will take 320mm rotors from any 96-03 600/750 or 01-02 1000 or TL, or Hayabusa

05-08 1000 and 06-07 600/750 take 310mm rotors only, from these years of the wheel only.

09+ 1000 and 08+ 600/750 take 310mm rotors only - note that these rotors are NOT compatible with the group immediately above & vice versa.
 
#899 ·
EUROJulian, I don't think there's an LSL top clamp with the ignition in the right place. You won't have a steering lock at all. Not sure if that matters to you.

Thou, I'll most likely do a custom bracket from the triple to the gauge. I also have a flyscreen, so it'll mostly be hidden. Add to that the mill I have and I can probably make an adequate bracket.

Having the ignition offset to the right will let me pull the gauge in closer vs where it is now (I currently have 05/06 GSXR1000 top clamp). I'm not sure quite how far out it'll have to be, I'll see when I get there.

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this is an older pic but shows my current gauge location

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an even older pic but shows the front end from a different angle

I'll be doing a lot of work on the front end soon: I just got my 06 600 forks back from Zoran with his valving, to match a Penske triple, and I'll replace the lower triple clamp due to a broken steering stop, and a Motion Pro Rev2 kit, and new bars (stock Monster 796 fatbars), and the top clamp.

I have a set of LSL clamps and headlight mounts that someone made that I bought a while ago that I'll put on while I'm in there.

I expect to have to make some more custom parts, but that's part of making improvements.
 
#971 ·
EUROJulian, I don't think there's an LSL top clamp with the ignition in the right place. You won't have a steering lock at all. Not sure if that matters to you. ....s.
It was few months since we last talked. I am slowly collecting all the parts needed for swap while I am finishing resto build on my other bike. We parted out discussing china top clamps and lost functionality of steering lock with the swap.

While selecting clamp I had this idea I want to bring under your collective peer check. I selected clamp that is symmetrical with intention of flipping it up side down to be able to mount ignition switch on the right side.
Here are pictures of clamp I got:

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This is a bottom up view:

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Some minor tweaking would be needed, but in general what do you guys think?

:naughty:
 
#900 ·
Cool, how did you mount the gauge in the pics above? I'm hoping to just drill two brackets I have but might do the headlight thing...or whatever you did.

Also, are they the R1 or R6 calipers? I'm contemplating them as my Tokico's are a mess. I have a 16mm master cylinder from an F4i so I imagine the R6 calipers will be the better choice

Look forward to hearing from you
 
#902 ·
R1 vs R6 calipers are the same AFAIK, I forget what they're off of. I found I couldn't get rid of some squish with an R6 master, I run an older GSXR radial master. I need to pick up an RCS sometime.

My current gauge mounting is off the ignition mount. It's basically independent of the headlight mount (although it does lightly push on the flyscreen, which is mounted to the headlight mounts).
 
#906 ·
I suppose I could change my signature to specify just R6 calipers, I haven't updated it in a while.

Bike is a 2006 so it's a factory S (we only got SV1000N in US in 2003), my recollection is that everything holding anything up front is custom but it was a few years ago.

If you look at my picture you'll see fork height, the top of the fork bodies themselves (not caps) is about flush with the top clamp. You appear to have GSXR1000 forks which I believe are a little shorter than the 06-09 600/750 that I'm using. I'm tall so I like all the ride height I can get as long as I don't compromise handling (and these can usually do with a little more swingarm angle, which is done by increasing ride height front and rear).


Could you take a couple measurements for me? Offset of centerline of handlebars vs steering stem, and height of centerline of bars over top clamp. I'm trying to figure out how to mount my Scotts damper.
 
#909 ·
Yes, basically all Japanese 4pot bikes use the same caliper mounts. That's how I run the Yamaha calipers.

The distance out is different I think. There's info on what's needed in the first post - if you want to avoid machining the calipers it says you'll need 320mm rotors. While I haven't confirmed that, D'Ecosse knows what he's doing.
 
#912 ·
Yeah, thought as much. I have my original wheel which has the 310mm disc, same as the later Gixxers. I'd need the calipers and longer mounting bolts. Good to know! I am tempted by the R6 calipers as well though as they're apparently better and look a bit tricker....

Oh I obviously didn't manage to get those measurements for you. Still need them?
 
#919 ·
Figured a few things out but still am trying to identify what I have. The right brake rotor is warped. Thickness varies almost 2 thousandths in spots. These were cheap Chinese eBay rotors from a previous owner.
Still can't identify the front end though. I don't want to invest in new rotors without knowing what I have. I did pull some the following measurements just in case anyone might have an idea.

Fork centers- 214mm

Fork diameter top clamp - 50mm
Fork diameter lower clamp -54mm then tapers to 50mm at bottom

Distance between disks inside to inside(offset rotors from hub but not sure of offset measurements) 127mm

Disk diameter 310mm (seem like they should be 320mm since the pads are riding close to the top edge)

I was tarting to think maybe it was a TL1000r front end with the wrong wheel/rotor combo but the axle design on the forks I have is different using a through bolt design with pinch bolts on the right fork only. TL has pinch bolts on both.
 

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#920 ·
214mm means it's old (or busa maybe?), which I don't really know anything about. I'd probably have to poke around on ebay or something and make a guess based on that.

You can't really measure runout on a floating rotor, because it floats, but if thickness varies that much it's done.

If they're 310s they're most likely OEM SV1000, I haven't seen aftermarket rotors for them.
 
#923 ·
I'm assuming you mean the hex nut on top of the triple clamp. I'd run GSXR value, although I doubt it's particularly important.

I believe both pinch bolts are M8 so I'd expect the same torque value.
 
#926 ·
The 2012 wheel won't work unless you do something special with the axle and wheel spacer. I don't recall for sure, but the rotors may need to be spaced further out, too. GSXR1000 wheel from like 2010 on, I think, or 08/09 600/750 wheel is what you need if going for the curved spoke. Look for wheels with "AOL" not "AON"
 
#928 ·
My understanding is that tapered roller bearings require different torque value vs the ball bearings that come stock, but I've always done it by feel instead.

I don't like mixing and matching bearing components, so I'd strongly recommend replacing at least the lower bearing (both the frame side and the triple clamp side).
 
#931 ·
I found this within an All Balls fitting PDF:

Reassemble the steering assembly.
a) Insert the steering stem back into the frame.
b) Place the upper bearing and seal onto the stem. Thread the spanner nut back
onto the stem. Torque spanner nut to factory recommended levels.
c) Place the top triple clamp and washer back into place thread the top nut back on
and torque to factory recommended levels.
d) Turn the assembly left and right to check for binding.