GSXR Rear Wheel Mod

[Perez]

There is a .pdf that somebody made documenting the GSXR rear wheel mod, and I have a couple of questions:

It talks about the fact that you need a COMPLETE rear wheel (Rotor, Rim, Cush, sprocket?) AND a Gthe correct GSXR Brake caliper

1) How does the caliper mount without a bracket or a change to the swingarm...ie, where does the caliper bolt to?

2) What do you do about the sprocket? Do you use the one from the GSXR or does the Old Yam one bolt right up?

3) Do you re-use the old axle from the Yam or do you use the one from the GSXR?

[Travis398]

the 10'th gsxr wheel mod thread discussed this in some depth................http://www.fjowners.com/index.php?topic=2762.0 

[carsick]

1) There is a bracket for the caliper that hangs from the axle bolt on the right side of the wheel. It has a bushing in it that the bolt clamps between the swingarm and the wheel bearing inner race. This bushing allows the caliper and bracket to pivot on the axle front to rear.
2)Use a Suzuki sprocket. Different bolt pattern than Yamaha. The GSX-R's tend to have more teeth, if you want closer to stock gearing try a Bandit 1200 sprocket.
3) Stock FJ axle works fine.
Good luck! I know I asked a lot of questions when doing mine, but it all made sense once I had the right parts in hand.
Doug

[Perez]

Thats right carsick....it an absolute Mind Fuc$%^ trying to straighten out in your mind all the options.
I won't go bankrupt if I get the wrong wheel, but its an absolute royal PITA to have a wheel you dont need sitting around in your garage for like a year until you find somebody who wants it.
I'd like to get the parts I need in-hand first.
I have a Bridgeport and a lathe at work, the machining is not a hassle at all, in fact that part would be fun.
I think the FZR rear wheel mod will be easier though.

[carsick]

If you have machining capability go for the YZF600 rear wheel. Cheaper, easier to find, stays all Yamaha, less confusing. Isn't the FZR rear an 18"? I think that would limit tire availability much like the 16" stocker. I'm just guessing.

[craigo]

Hello All,

I just purchased the entire wheel and brake hardware from a 1990 GSXR 750.  Yep, got all the parts from one bike.  Looking forward to doing the 17 inch wheel conversion over the winter, but I got to wear out my last D205 first.   

Damn, I am excited!!!

CraigO
90FJ1200

[craigo]

Has anyone used a Dunlop Sportmax 170/60-17 on their 17" rear wheel?  If so, any clearance issues or anything else I should be worried about?

CraigO
90FJ1200

[widget]

There is a .pdf that somebody made documenting the GSXR rear wheel mod, and I have a couple of questions:

It talks about the fact that you need a COMPLETE rear wheel (Rotor, Rim, Cush, sprocket?) AND a Gthe correct GSXR Brake caliper

1) How does the caliper mount without a bracket or a change to the swingarm...ie, where does the caliper bolt to?

2) What do you do about the sprocket? Do you use the one from the GSXR or does the Old Yam one bolt right up?

3) Do you re-use the old axle from the Yam or do you use the one from the GSXR?

You will need the complete rear wheel assembly, matching caliper and caliper mounting bracket. I used 1991 GSXR 750, 3.5 & 5.5 inch wide X 17 wheels for my swap. I used everything but the wheel spacers.  The swap required machining new spacers to get the wheel in the center of the swingarm. I machined a billet brake stay and welded a new mounting tab on the bottom of the swingarm to mount the other end of the brake stay. Then remove the sprocket and machine it's mounting surface to line up the chain. You can use your FJ axle as is. Be careful with your tire choice so you won't need to trim the tire to clear the chain. I just installed Dunlop Roadsmart dual compound tires and the rear cleared with room to spare, i am using a 170/60-17.

The front is a lot more fabricating, wheel bearings, spacers, caliper brackets, brake lines, speedo cable adapter and speedo busshing for the FJ axle.  I did this around 1993 and more will come to me later, i have pictures and i will post them when i can figure out how to post them.  I am computer challenged so this may take a while.
I am a new member and this is my first time posting on a website.  I hope this will help, Cheers, Widget

[craigo]

Hey Widget, Thanks for the tire info, however, I was under the impression that there was no machining necessary with the GSXR wheel swap.  Just needed a couple of 4mm spacers on each end on the wheel assy in the swing arm.  Also the sprocket carrier required no machining, just a 40 tooth bandit sprocket.

I am also wondering, use the Suzuki brake master cylinder, or retain the Yamaha?

Is my info wrong or are we taking different roads to reach the same place?

CraigO
90FJ1200

[Arnie]

Craigo,

I installed a GSXR rear on my FJ in 1998.  Since then, many others have also used the GSXR as an easy no-machining option to get a 17" rear wheel.  I have never heard of anyone needing to do any machining of the carrier, sprocket, or internal spacers unless they were using a 180 or wider tire.  There have been a number of ways to anchor the brake stay to either the swingarm or the chassis.  While there may be some theoretical advantage to one or the other, in real world usage they all seem fine.
The FJ rear M/C works just fine, but you may need a slightly longer brake hose.

All above is correct and true to the best of my knowledge - BUT it is your bike and your mod.  Get the parts and measure it all yourself.  That way you'll know.

Cheers,
Arnie

[craigo]

God bless you Arnie,

So the spacers are still in doubt.  As I am sure that when I get all the parts in front of me, these will go away.  I feel that all I need to do is measure the sprocket distance from the swingarm to the sprocket on the OEM set up and duplicate it on the GSXR wheel.  Then there should be no deflect on the chain/sprocket assy.  But will the tire be centered?  Am I thinking right or am I missing something?   

Thanks,

CraigO
90FJ1200

[widget]

Hey Widget, Thanks for the tire info, however, I was under the impression that there was no machining necessary with the GSXR wheel swap.  Just needed a couple of 4mm spacers on each end on the wheel assy in the swing arm.  Also the sprocket carrier required no machining, just a 40 tooth bandit sprocket.

I am also wondering, use the Suzuki brake master cylinder, or retain the Yamaha?

Is my info wrong or are we taking different roads to reach the same place?

CraigO
90FJ1200

Craig,

If i remember correctly the GSXR rear axle is a larger diameter than the 1984 FJ. I changed the wheel bearings and inner sleeve to match the FJ axle OD. The spacers needed to change to match the Axle, center the wheel and just look trick out of aluminum.  The spacer between the caliper bracket and the bearing is the same width as the GSXR. I machined the spacer between the caliper bracket and the swingarm with a thin flange and pressed it into the bracket to retain it and match the axle diameter. The sprocket side spacer is the same OD to match the seal, axle OD and wheel centering apply.

I needed to machine the sprcket to move the chain closer to the wheel centerline, not the best for tire clearance. I learned something about tires and profiles along the way, we can talk later if anyone is interested.

I used the FJ master and made up a longer brake line routed it down along the brake stay and to the caliper.

I posted some pictures in the gallery under Widget (the dog) and some shots of my FJ. I will try to attach them, still learning!

Cheers, Widget

[craigo]

Thanks Widget, but is there a difference between the 84 and the 90 rear wheel assys?  Maybe that is the conflict in what you are suggesting and what I have read.  Anyway, once I get the wheel assy, I am sure that alot of these silly questions will go away.

Plus, I am like a kid on Christmas Eve over this.

CraigO
90 FJ1200 

[roverfj1200]

God bless you Arnie,

So the spacers are still in doubt.  As I am sure that when I get all the parts in front of me, these will go away.  I feel that all I need to do is measure the sprocket distance from the swingarm to the sprocket on the OEM set up and duplicate it on the GSXR wheel.  Then there should be no deflect on the chain/sprocket assy.  But will the tire be centered?  Am I thinking right or am I missing something?   

Thanks,

CraigO
90FJ1200

You are trying to over complicate the mod Mate.. For the spacers I used 4 S/S washers. Run a 180 PR2 rear. Clearance is good. except the plastic chain cover and a slight touch on the inner mud guard..

Once you slide the wheel in to place it will all look and be easy..

Richard

[X-Ray]

Hello guys, I've got a series of pics here   http://s367.photobucket.com/albums/oo115/raywise_2008/FJ1200%20Wheel%20Change/    showing what I did to do the rear wheel mod. It works well, and the GSX-R wheel looks like it was made for the FJ. 

Anyway, slightly older thread but thought it would help,

Hoo Roo
Ray