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Anyone tryed cb750 rear hub?

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Anyone tryed cb750 rear hub?

PostAuthor: repair » Fri Aug 11, 2017 1:19 pm

faffi wrote:If you seek online, you will find many sites (prolly this one as well) have listings of wheel axle sizes. So you may be able to find other wheels that will be easier to fit than that of an XS650. But the main issue will often be that of getting both the sprockets and rims to run in line - although you will hardly notice a rim offset that's less than 20 mm when it comes to handling.


I should try too mount a cb 750 rear hub xs650 has no rubber damping
and cb750 has 20mm axle so i hope it's possible
on front I'm not sure yet
Anyone tryed cb750 rear hub?

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Re: Anyone tryed cb750 rear hub?

PostAuthor: beltdrive » Fri Aug 11, 2017 3:32 pm

You will need a Honda brake drum as well, I like to keep everything as simple as possible, as how to get spares later.

On my XV 1000 Beltdrive, I have spoke hubs front and rear, from a 1984 Virago, on the rear, I cut the spokes of a TR1 rim, then I cut of the brake drum part of the hub, I machined the sprocket/damper hub-part, where the sprocket and rubber dampening sits and bolted it on to the spoke hub, where the driveshaft spline had been bolted on and then you have a chain drive spoke hub, on which you can mount almost any rim size, that can clear your front and back forks.

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Re: Anyone tryed cb750 rear hub?

PostAuthor: briandk » Mon Aug 14, 2017 12:50 am

repair wrote:
faffi wrote:If you seek online, you will find many sites (prolly this one as well) have listings of wheel axle sizes. So you may be able to find other wheels that will be easier to fit than that of an XS650. But the main issue will often be that of getting both the sprockets and rims to run in line - although you will hardly notice a rim offset that's less than 20 mm when it comes to handling.


I should try too mount a cb 750 rear hub xs650 has no rubber damping
and cb750 has 20mm axle so i hope it's possible
on front I'm not sure yet
Anyone tryed cb750 rear hub?


I'm wondering how difficult it is to fit also. The description of this bike says he runs a cb750 hub on the rear: http://www.bikeexif.com/yamaha-tr1-cafe-racer

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Re: Anyone tryed cb750 rear hub?

PostAuthor: faffi » Mon Aug 14, 2017 2:55 pm

Surprised that there was enough clearance towards the chain to run the CB750 hub. Perhaps he shimmed the sprocket or found a different sprocket carrier that fit. Something off a cruiser may be a better option if running a wide rear tyre. Kawasaki Vulcan 800 and chain drive Honda Shadow 600/750/800 as well as the Savage 650 from Suzuki could be good options worth checking out.
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Re: Anyone tryed cb750 rear hub?

PostAuthor: Jake » Mon Aug 14, 2017 3:55 pm

There is at least two, maybe three lists of axle and fork tube sizes in VTF Tech Articles.

Look for the one I posted, it's different than others in the respect that I have made all of the Virago info in red fonts so it's easy to find.
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Re: Anyone tryed cb750 rear hub?

PostAuthor: briandk » Tue Aug 15, 2017 3:35 am

faffi wrote:Surprised that there was enough clearance towards the chain to run the CB750 hub. Perhaps he shimmed the sprocket or found a different sprocket carrier that fit. Something off a cruiser may be a better option if running a wide rear tyre. Kawasaki Vulcan 800 and chain drive Honda Shadow 600/750/800 as well as the Savage 650 from Suzuki could be good options worth checking out.


I emailed member motorpickle who has also posted on this forum that he used cb750 rear hubs for conversions and he mentions that you probably want a hub from a later year cb750 as they had a different sprocket carrier. I looked into it a bit and the 77-78 version of the bike ( at least the UK version) use a 17" rim and 630 sprocket on the rear.

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Re: Anyone tryed cb750 rear hub?

PostAuthor: repair » Wed Aug 23, 2017 12:36 pm

briandk wrote:
repair wrote:
faffi wrote:If you seek online, you will find many sites (prolly this one as well) have listings of wheel axle sizes. So you may be able to find other wheels that will be easier to fit than that of an XS650. But the main issue will often be that of getting both the sprockets and rims to run in line - although you will hardly notice a rim offset that's less than 20 mm when it comes to handling.


I should try too mount a cb 750 rear hub xs650 has no rubber damping
and cb750 has 20mm axle so i hope it's possible
on front I'm not sure yet
Anyone tryed cb750 rear hub?


I'm wondering how difficult it is to fit also. The description of this bike says he runs a cb750 hub on the rear: http://www.bikeexif.com/yamaha-tr1-cafe-racer


Tanks for response
I you look closely on picture of rear hub you can see a spacers behind sprocket

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Re: Anyone tryed cb750 rear hub?

PostAuthor: repair » Wed Aug 23, 2017 12:42 pm

briandk wrote:
faffi wrote:Surprised that there was enough clearance towards the chain to run the CB750 hub. Perhaps he shimmed the sprocket or found a different sprocket carrier that fit. Something off a cruiser may be a better option if running a wide rear tyre. Kawasaki Vulcan 800 and chain drive Honda Shadow 600/750/800 as well as the Savage 650 from Suzuki could be good options worth checking out.


I emailed member motorpickle who has also posted on this forum that he used cb750 rear hubs for conversions and he mentions that you probably want a hub from a later year cb750 as they had a different sprocket carrier. I looked into it a bit and the 77-78 version of the bike ( at least the UK version) use a 17" rim and 630 sprocket on the rear.



Thanks for info
i have bought a 78 cb750 hub, waiting for the postman next problem is the offset

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Re: Anyone tryed cb750 rear hub?

PostAuthor: briandk » Wed Aug 23, 2017 11:09 pm

repair wrote:
Thanks for info
i have bought a 78 cb750 hub, waiting for the postman next problem is the offset


Waiting for mine to drop off a 77 wheel from ebay. Looking forward to see what you find out also.

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Re: Anyone tryed cb750 rear hub?

PostAuthor: briandk » Sat Oct 07, 2017 4:38 pm

Small update.

The ebay seller messed up, so I actually got a 79+ dohc cb750 wheel, which I found out trying to fit a K8 sohc brake plate to it. Fortunately it mates perfectly to the K8 sprocket carrier and I found a NOS dohc brake anchor plate for 7 eur on eBay. I now have a bit of a mix of components, but measurements look good and I will try to do a test fit on my parts bike as soon as I get a jack (no center stand).

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Re: Anyone tryed cb750 rear hub?

PostAuthor: faffi » Sun Oct 08, 2017 12:51 pm

Will follow with interest.
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Re: Anyone tryed cb750 rear hub?

PostAuthor: briandk » Sun Nov 05, 2017 2:05 pm

Looks like a resonable straight fit:

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Re: Anyone tryed cb750 rear hub?

PostAuthor: faffi » Sun Nov 05, 2017 3:45 pm

:GJ: (or great luck ;)
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Re: Anyone tryed cb750 rear hub?

PostAuthor: briandk » Mon Nov 06, 2017 7:32 am

faffi wrote::GJ: (or great luck ;)


Probably the latter :)
I'll update when I've worked out the exact spacing and got chainwheel and countershaft sprocket installed.

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Re: Anyone tryed cb750 rear hub?

PostAuthor: ejunker » Wed Mar 21, 2018 2:32 pm

If it's not from Texas, does it really matter?
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Re: Anyone tryed cb750 rear hub?

PostAuthor: briandk » Thu Mar 29, 2018 11:58 am

Progressing with my build and tested the alignment and spacers needed. The left side honda CB spacer seems to position the wheel exactly center and with the rear sprocket aligned with the countershaft one. Right hand CB spacer needs about 5-10mm trimmed off it and it should fit. Going to get the correct measures and get a hold of a guy I know with a lathe.
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Re: Anyone tryed cb750 rear hub?

PostAuthor: faffi » Thu Mar 29, 2018 1:15 pm

:GJ:
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Re: Anyone tryed cb750 rear hub?

PostAuthor: briandk » Fri Apr 13, 2018 3:04 pm

So the complete setup I ended with is:

Honda 79+ DOHC CB750 spoked wheel
Honda CB750KZ brake ancher plate ( think any the 79+ dohc ones work )
Honda 78 K8 CB750 sprocket carrier
Honda axle spacers/collars (brake side trimmed to 20.5mm)
Yamaha TR1 axle and chain tensioners

I am running 530 chain with a custom machined 19t front and a 38t JT rear from a Honda cb650.

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Re: Anyone tryed cb750 rear hub?

PostAuthor: faffi » Sat Apr 14, 2018 1:53 pm

Many will be very grateful for that list :urock:
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