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gs750 suspension conversion

  • Thread starter Thread starter silverbullet132
  • Start date Start date
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silverbullet132

Guest
What is the easiest way to put 17" rims and tires on a 78 gs750? USD forks would be nice but are not too important, though I would like to have radial brakes if possible.
 
Go to the User CP and Edit Options. Also set your posts to 40 so you get more per page - less page turning
 
The easiest, is to use GSXR 1100 K ( 1989) triples with Bandit 1200 fork tubes.
The wheels come from the same GSXR model in order to get a 4.5" rear wheel.
Here's an example on my 1100 Kat with extended GSXR 1100 fork legs later replaced with Bandit fork legs:
401a7447.jpg

New lock stops required...
Katana1100SZ005_zps30159c94.jpg

Seen from the back
Katana1100SZ009_zps9ca73e5a.jpg
 
What swingarm though? Same 89 GSXR? What tire does that let you run, 160?

Can I just use an entire bandit front end? Or an entire 89 gsxr front end? Keep in mind this is for a 78 gs750 and not a katana.
 
On the Kat, I have the std aluminum swingarm that is dimensionally identical to the steel one on the GS 1000.
You need the complete rear wheel assy from the GSXR including the caliper.
The tire is 160 wide.
You will also need an offset engine sprocket to get the 530 chain lined-up...
A new support is needed for the brake stay but I can send you pictures if needed.
As far as the differences between the GS 750 and GS 1000, I believe there are minor but you can check if the triple's bearings are identical on the allbearings site:cool:
For the front end, I believe the Bandit lower triple tree's stem is too long for the GS's?
I haven't tried personally.
Beware when you mix and match Bandit 1200 ( 1st gen) and GSXR K front wheels as the disk offsets are different;)
 
Probably more work than you planned but here is my conversion. 95 GSXR 1100 front end, 98 Bandit 1200 rear.

gs110023_zps20b7cc45.jpg
 
jwhelan65 said:
Probably more work than you planned but here is my conversion. 95 GSXR 1100 front end, 98 Bandit 1200 rear.

gs110023_zps20b7cc45.jpg
Click to expand...

That is absolutely gorgeous, pretty much exactly what I wanted really. How much work was needed for that front end? I also heard the gs1100 swingarm is a straight swap.

Anyone got an idea of what rim setup would go into that for a 160/170/180 tire? Any of the 3 is fine.
 
Without question the most difficult part was getting the gauges monted and lined up properly. The front end is a direct bolt up..but that is just the beginning..:o
 
jwhelan65 said:
Without question the most difficult part was getting the gauges monted and lined up properly. The front end is a direct bolt up..but that is just the beginning..:o
Click to expand...

I was going to change the gauges for a koso or vapor unit anyways. What do you mean that is just the beginning?

Will the same front end you have on yours mount to my 78?
 
silverbullet132 said:
I was going to change the gauges for a koso or vapor unit anyways. What do you mean that is just the beginning?

Will the same front end you have on yours mount to my 78?
Click to expand...

There are many decisions to make along the way according to what your individual objectives and taste are. Start making a list including all the details of brake lines and cables, handle bars, brakes , master cylinders gauges....etc
In many cases the decisions are interrelated as well.


By the way I run an 170/60-18 on my 4.5x18" wheel in a Dunlop Roadsmart,

http://www.motorcycle-superstore.co...Dunlop-Roadsmart-Sport-Touring-Rear-Tire.aspx


I don't like the way the Road Pilots fit the same rim in same size (stick to 160 if you do Road pilots)
http://www.michelinmotorcycle.com/index.cfm?event=pilotroad2

If you go 17x5.5 on the read expect more issues with chain clearance and a longer offset on the counter sprocket. It is doable and has been done many times before just expect to get into more details of chain width and rear axle spacer combinations.

For a 750 you are probably just as well off with the 4.5" rear tire.
 
posplayr said:
There are many decisions to make along the way according to what your individual objectives and taste are. Start making a list including all the details of brake lines and cables, handle bars, brakes , master cylinders gauges....etc
In many cases the decisions are interrelated as well.


By the way I run an 170/60-18 on my 4.5x18" wheel in a Dunlop Roadsmart,

http://www.motorcycle-superstore.co...Dunlop-Roadsmart-Sport-Touring-Rear-Tire.aspx


I don't like the way the Road Pilots fit the same rim in same size (stick to 160 if you do Road pilots)
http://www.michelinmotorcycle.com/index.cfm?event=pilotroad2

If you go 17x5.5 on the read expect more issues with chain clearance and a longer offset on the counter sprocket. It is doable and has been done many times before just expect to get into more details of chain width and rear axle spacer combinations.

For a 750 you are probably just as well off with the 4.5" rear tire.
Click to expand...

I am fine with a 4.5" tire, but would like to keep it at 17". Is it just the 95 gsxr 1100 front end that fits or can any gsxr 1100 usd front end fit?
 
John Kat said:
As I suggested earlier, you can check the bearings used on the triples for both models on the allbearings site.
The GS 1000 and 11000 Katana are the same size.
Click to expand...

So, I need 954 triples (top and bottom) + up to 1996 GSXR 750 front end?

The GS1000 top bearings match up but the bottoms do not:

GS750:
Top: 25 id 48 od 13 width
Bottom: 27 id 48 od 14 width

GS1000:
Top: 25 id 48 od 13 width
Bottom: 30 id 48 od 12 width

CBR954:
Top: 26 id 48 od 14 width
Bottom: 30 id 48 od 12 width

Maybe RC51 forks in 954 triples? RC51 seems to be a common swap for the 954 guys.
 
Last edited:
silverbullet132 said:
So, I need 954 triples (top and bottom) + up to 1996 GSXR 750 front end?

The GS1000 top bearings match up but the bottoms do not:

GS750:
Top: 25 id 48 od 13 width
Bottom: 27 id 48 od 14 width

GS1000:
Top: 25 id 48 od 13 width
Bottom: 30 id 48 od 12 width

CBR954:
Top: 26 id 48 od 14 width
Bottom: 30 id 48 od 12 width

Maybe RC51 forks in 954 triples? RC51 seems to be a common swap for the 954 guys.
Click to expand...
I see no problem in fitting a GS 1000 stem with it's own bearings in a GS 750 frame as the outside diameter of the bearings are identical:cool:
I read an article a couple of years ago in a British magazine about a GS 750 with a GSXR G/H fork.
To me it should be a simple drop in for the GSXR 1100 K ( RSU) triples in the GS 750 frame ( except the lock stops of course) as I've used both types of forks on my GS 1000/1100's.
Else you can go for the USD GSXR forks with 954 triples as stated.
 
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