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The hubs I used on my bike are from a 76 750F. I wanted to have a disc brake on the back and dual discs in the front.
When I was searching for front rotors I found out that the 900RR rotors and the stock 750 rotors had some dimensions that were close enough to make it a pretty easy swap.
The 750 has a six bolt pattern with a 79mm bolt circle and the 900RR rotor has a 76mm six bolt pattern. I ended up using rotors from a CBR 929 because I wanted to run 320mm discs and I needed more clearence for the wider calipers that I was using from the 900RR. If you used the floating calipers from the 750 and made brackets to move them out to match the bigger rotors I think it would work out pretty good. I plan on building a SOHC 750 when I'm done with this bike and I am going to use this setup then.
In the last picture you can see the bolt holes in the hub through the rotor holes , It would be easy to make them fit if you wanted to run bigger/lighter rotors. I'm going to use a KX250 rotor on the back I will post pics as soon as I have the rotor.
It's good to see that other are doing this stuff also. Heres some pics of a few front ends I have done. The last pic is a front hub laced to an 18 inch wheel converted to rear use with custom brakes.
The swinging caliper arrangment on the CB 750 K models have brake shoes that are too wide for use with the narrow band discs. The brake pads will hit the buttons on the discs.
It's good to see that other are doing this stuff also. Heres some pics of a few front ends I have done. The last pic is a front hub laced to an 18 inch wheel converted to rear use with custom brakes.
The swinging caliper arrangment on the CB 750 K models have brake shoes that are too wide for use with the narrow band discs. The brake pads will hit the buttons on the discs.
It looks like the GL forks are good way to go for dual disks.
I still haven't recieved the new rotor for my rear brake it should be here
today or tommorow.
I think it should be easy to fit the KX rotor on the F hub the hole pattern
and spacing are very close. I made a spacer to line up the rotor
with the caliper I just need to have the rotor so I know how thick to make it.
It looks like the GL forks are good way to go for dual disks.
I still haven't recieved the new rotor for my rear brake it should be here
today or tommorow.
I think it should be easy to fit the KX rotor on the F hub the hole pattern
and spacing are very close. I made a spacer to line up the rotor
with the caliper I just need to have the rotor so I know how thick to make it.
The GL forks are great replacement forks for the CB 750 SOHC. I've found that the fork tubes with the 2 mounting tabs work best and are the easiest to work with. The early CB 750 SOHC Swinging caliper is a bugger to work with and often takes many peices to get the orientation/spacing correct.
I have the GL forks with the 320 mm discs on my CB 750 now (on the right in the top picture), but they may be replaced with the CBR 900 discs and the same calipers. I recently changed from mags to the Boranni style spoked rims and the 320 discs cover more of the "purrty" spokes than I like.
I put alot of work in the rear wheel conversion just to get the look that I wanted and it will get a newer CBR 900 disc also (it has an earlier CBR 900 disc on it now with a different pattern on the disc carrier). The sprocket mount was made out of a big chunk of aluminum amd the wheel has been converted to 20mm bearinga and has a bearing added to the sprocket adaptor.
Post pics of your rear wheel when you get it figured out. I love seeing these kind of mods. Having a mill and a lathe really opens up the possibilities !!
DG
Dang! It looks like the rear disc was almost made for that hub.
Making a spacer for the disc? It looks like the caliper may be a bit close to the hub with out it. Looking good!!
I finished up the CBR disc/ GL front end brakes and they may be put on my CB. I'll look at it for a while to see which one I prefer. The smaller CBR discs with more offset open up the wheel for the spokes to be seen and add a wider look to the wider front end.
DG
That's some really nice work Mate! Question for you that may have been answered though I didn't see it referenced.....
What did you do to allow that wider rim and thusly offset chain to run to the engine. Did you machine an adapter for the primary sprocket as well or use an offset? I have a similar project in mind and I'd love to know....thanks!
That's some really nice work Mate! Question for you that may have been answered though I didn't see it referenced.....
What did you do to allow that wider rim and thusly offset chain to run to the engine. Did you machine an adapter for the primary sprocket as well or use an offset? I have a similar project in mind and I'd love to know....thanks!
That is the factory 76 CB750F hub and sprocket carrier, 5.5" rim and 180 tire.
Stock 750 rear sprocket no offset ,and a stock 900F front sprocket.
Everything is centered and straight with about 1/4" clearence where the chain runs next to the tire.
Here is the rear brake adapter with the KX250 sprocket mounted on it.
I'm going to remove the studs from the hub and use 8mm x 1.25 counter sunk allen bolts to attach the adapter to the hub. I'm waiting for the hardware I ordered so I can finish it.
I would have never thought that a 5.5 wide wheel would fit that bike so nice. The brake is looking good too!!
Man, you ought to do a write up on that bike complete with details.
The front hub is the same on most of the early CB models (6 bolt discs), but the weird swinging caliper arrangement mounting style on the forks makes these conversions very hard to do with the stock forks. It is made easier with a fork swap (IE; GL 1000).
DG
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