Topic: GSXR Rear Wheel on CB750F

[Foyil100]

Hi All,

I'm in the process of building a GSXR front-end for my 78' CB750F, my original plan was to purchase the Sun Rim setup over at CognitoMoto but starting to think $900 for one wheel is a bit steep so now I'm thinking of going stock GSXR wheels for the front and rear.

Here is my question - what needs to be done in order to get a stock REAR sportbike wheel on one of our bikes? Is it a matter of offset sprocket and new axle? Or is it going to be a lot more than that?

Thanks everyone for all the help you've given me so far on my build 

[Retro Rocket]

Ok, look for a 1988 GSXR1100J rear wheel 18x4.5 inch, or a 1988 gsxr750J rear wheel 17x4.5 inch, the 4.5 inch rim will fit the stock arm, you will need to run a 10mm offset front sprocket and machine what ever is  needed from the gsxr rear sprocket carrier {i've already done this but can't remember how much was removed}, it will match up perfectly this way and both those model wheels have the same sized axle as the Honda, so basically you can use the stock Honda axle...
If you use later 5 inch or larger wheels you will have far bigger problems....

[Foyil100]

First you need to know the length of the stock versus the donor swing arm. Then, you need to determine the width at the pivot, and the diameter of the pivot rod. If you can find a donor system that carries very similar dimensions, it's a good candidate. Of otherness, you need to do this with a dual shock swing arm, or fabricate a mono shock setup on the back end of your bike.

The rear axle is not a concern if you're using the replacement wheel and arm.

Thanks Calj, I was hoping I could use the stock arm however. From what I've seen, this can be done.

[Foyil100]

Ok, look for a 1988 GSXR1100J rear wheel 18x4.5 inch, or a 1988 gsxr750J rear wheel 17x4.5 inch, the 4.5 inch rim will fit the stock arm, you will need to run a 10mm offset front sprocket and machine what ever is  needed from the gsxr rear sprocket carrier {i've already done this but can't remember how much was removed}, it will match up perfectly this way and both those model wheels have the same sized axle as the Honda, so basically you can use the stock Honda axle...
If you use later 5 inch or larger wheels you will have far bigger problems....

Thanks Retro! Okay, I'll take a look for those wheels but now my question is will just about any 17x4.5 fit? I mean, it doesn't have to be from a GSXR does it?

The ideal situation would be to pick up a set of supermoto wheels on ebay like these :http://www.ebay.com/itm/SUZUKI-RMZ450-SUPERMOTO-WHEELS-TIRES-FRONT-REAR-complete-08-14-DNA-racing-/261546333945?pt=Motorcycles_Parts_Accessories&hash=item3ce56056f9&vxp=mtr

or these
http://www.ebay.com/itm/SUPERMOTO-WHEELS-WITH-TIRES-17-HONDA-CR-CRF-250-450-WITH-BRAKE-ROTORS-MOTARD-/360481333741?pt=Motorcycles_Parts_Accessories&hash=item53ee5ca1ed&vxp=mtr

[Retro Rocket]

Ok, look for a 1988 GSXR1100J rear wheel 18x4.5 inch, or a 1988 gsxr750J rear wheel 17x4.5 inch, the 4.5 inch rim will fit the stock arm, you will need to run a 10mm offset front sprocket and machine what ever is  needed from the gsxr rear sprocket carrier {i've already done this but can't remember how much was removed}, it will match up perfectly this way and both those model wheels have the same sized axle as the Honda, so basically you can use the stock Honda axle...
If you use later 5 inch or larger wheels you will have far bigger problems....

Thanks Retro! Okay, I'll take a look for those wheels but now my question is will just about any 17x4.5 fit? I mean, it doesn't have to be from a GSXR does it?

The ideal situation would be to pick up a set of supermoto wheels on ebay like these :http://www.ebay.com/itm/SUZUKI-RMZ450-SUPERMOTO-WHEELS-TIRES-FRONT-REAR-complete-08-14-DNA-racing-/261546333945?pt=Motorcycles_Parts_Accessories&hash=item3ce56056f9&vxp=mtr

or these
http://www.ebay.com/itm/SUPERMOTO-WHEELS-WITH-TIRES-17-HONDA-CR-CRF-250-450-WITH-BRAKE-ROTORS-MOTARD-/360481333741?pt=Motorcycles_Parts_Accessories&hash=item53ee5ca1ed&vxp=mtr

The reason i stated those 2 wheels is due to having the same axle size, it just makes things easier, also, there's plenty of meat on the sprocket carrier so its easy to remove enough to line the chain up, they are also cheap because gixxer riders prefer the 5.5 inch wheels, the 4.5 isn't as popular..... I commented on the gixxer wheels because thats what you asked about and thats where my experience lies...   The other wheels you linked could be modded to suit but i can't help you there..

[Retro Rocket]

As Retro said, it can all be made to fit. But axles will differ, sprockets may differ as well, offset front sprocket will be needed to clear a 150/ tire. A rear caliper mount, a rear master cylinder, reservoir, and if your swing arm is changed to accommodate the wheel and tire, your upper shock mounts are effected.

If you want a sexy rear with discs, Retro gave you a great solution and one that's pretty cheap.

I should take my own advice Cal, every bloody thing I buy is expensive....

[dusterdude]

When i installed my cbr wheel,i just made new spacers,fit real good

[Foyil100]

When i installed my cbr wheel,i just made new spacers,fit real good

What year was the CBR wheel?

[Retro Rocket]

Maybe you need to supply some more information here, you've said you are using a GSXR front end and inquired about a GSXR rear wheel, the easiest solution is to stay with the Suzuki stuff, that way there's no fabrication needed in the front and only a small amount at the rear, that includes small mods to the spacers to suit. If moneys no problem and you wanted more exotic mods please say so, the bike will look silly with a CBR rear and GSXR front wheels and a CBR front wheel would have to be modified to fit the front GSXR forks,  even disc spacings or offset will be different......

[Foyil100]

I'm just trying to weigh my options, if I know a CBR wheel will fit i'd like to know what year.

You're right, I am doing a GSXR front end (fork build) and ideally would like to have a spoked wheel for F&R but at ~$900 a wheel its seeming too much $$ so for the time being I may just settle for a solid wheel like the GSXR. The thing is though as mentioned earlier about the 1988 wheel fitting - I don't really want to put a '88 wheel on the rear and an 07+ wheel on the front. I'd like to hear if someone put a newer GSXR wheel on the rear and how it was done

[Retro Rocket]

I'm just trying to weigh my options, if I know a CBR wheel will fit i'd like to know what year.

You're right, I am doing a GSXR front end (fork build) and ideally would like to have a spoked wheel for F&R but at ~$900 a wheel its seeming too much $$ so for the time being I may just settle for a solid wheel like the GSXR. The thing is though as mentioned earlier about the 1988 wheel fitting - I don't really want to put a '88 wheel on the rear and an 07+ wheel on the front. I'd like to hear if someone put a newer GSXR wheel on the rear and how it was done

I haven't seen one on this forum mate and i've been here about 9 years, maybe longer. The later wheels are 5.5 or 6 inch wide and are just too big to fit without either owning your own machine shop or fitting a highly modded or custom swing arm, thats why i suggested the earlier wheels, you can get them as a set and change the bearings out at the front to suit the different axle diameter of the 88 front wheel, it is a 3.5 inch front so thats no problem as its the same as the 07 as far as width goes... I'm not sure about the discs but if i were you, i would be looking for a good breaker {wrecker} and taking a tape measure and set of verniers and go have a look and do some measuring, you'll have more trouble fitting a 2007 rear wheel than the ones i suggested due to its width...

[neevo]

Why not stock 750 hubs matched to buchanans spokes and rims. You can then customise the axle and bearings to match the forks. That's what I did on my 400F, all up approx $1000

[Foyil100]

Why not stock 750 hubs matched to buchanans spokes and rims. You can then customise the axle and bearings to match the forks. That's what I did on my 400F, all up approx $1000

The hub in the comstar rim? I plan on drilling out the hub in the rear comstar wheel and having it mated to a Sun Aluminum rim (buchanans) but I was going to buy the gsxr hub from cognito moto.

[Retro Rocket]

Why not stock 750 hubs matched to buchanans spokes and rims. You can then customise the axle and bearings to match the forks. That's what I did on my 400F, all up approx $1000

The hub in the comstar rim? I plan on drilling out the hub in the rear comstar wheel and having it mated to a Sun Aluminum rim (buchanans) but I was going to buy the gsxr hub from cognito moto.

He's talking about stock spoke wheel hubs, not cut up comstars, there is now way in hell i would even think of modifying a comstar for spokes...   bad idea...

[Foyil100]

Why not stock 750 hubs matched to buchanans spokes and rims. You can then customise the axle and bearings to match the forks. That's what I did on my 400F, all up approx $1000

The hub in the comstar rim? I plan on drilling out the hub in the rear comstar wheel and having it mated to a Sun Aluminum rim (buchanans) but I was going to buy the gsxr hub from cognito moto.

Here's my plan for the rear wheel (thanks to MotoSynthesis!)... http://motosynthesis.blogspot.com/p/products.html

He's talking about stock spoke wheel hubs, not cut up comstars, there is now way in hell i would even think of modifying a comstar for spokes...   bad idea...

[Retro Rocket]

Foyil - you are not the first person to consider that conversion. I will say this: I'd never to do it (I have to agree with Retro). Just because people do "stuff" and post build blogs or show them on BikeExif, doesn't make it sound engineering. Or safe. And that latter point is what you should most consider.

Undertaking that modification and who do you turn to with a problem? 99% of those who lace spokes to hubs built and designed for them! never have a problem. And that is something you should seriously consider.

I get you want something cool and unique, me too. But I place a far higher importance on the "soundness" of the engineering and design behind it than the aesthetic or cost. The cheapest visit you'll ever make to the ER is still far more expensive than the most expensive part you'll ever buy for your bike. Think about that. Then get a stock 750 hub designed for spokes and use custom mounts for a disc brake. Much easier and much safer.

Exactly Cal, if i am going to do modifications to my bikes they have to be superior to what they replace, improvements, not modifications for the sake of it....

[Foyil100]

Do either of you know an OEM spoked rear hub that would work with disc breaks? I've heard of some people using harley hubs but not sure what model/years.

[754]

Honda 750 F ...75  and 76.

[Retro Rocket]

Honda 750 F ...75  and 76.

Yep, i have 3 of them...

[Foyil100]

Honda 750 F ...75  and 76.

Yep, i have 3 of them...

Want to sell one?   

[Retro Rocket]

Honda 750 F ...75  and 76.

Yep, i have 3 of them...

Want to sell one?   

nnnnnnnnnnnnnnnnnnnnnnn no...

Unfortunately, the 75-76F's were the only model to have a spoked disc rear wheel and I have enough bikes to use them on... ....

[strynboen]

the disc are as big as the hveel..they looks and breakes almost too good..

[Foyil100]

Just picked up a '76 CB750F wheel (rim, hub, spokes, tire, sprocket and disc) for $275 (all I really needed is the hub/disc) but hey I'm on the right track! Going to mount it up to a 17" Sun Rim at some point. Thanks everyone for all the great advice!