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Offline bwaller

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Lightweight Rear
« on: October 22, 2016, 08:50:02 am »
It's been discussed but has anyone actually used a front hub for a rear wheel with small disc? I'm curious about the final weight of this wheel setup.
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Offline slikwilli420

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Re: Lightweight Rear
« Reply #1 on: October 22, 2016, 10:23:32 am »
I'm going to eventually use a dirt track billet quick change hub with small disc for mine. Hub without bearings doesn't weigh much more than just the sprocket carrier on a 750. Will need to make a bearing carrier for the sprocket but that's no biggie.
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Offline voxonda

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Re: Lightweight Rear
« Reply #2 on: October 22, 2016, 12:59:08 pm »



Hi Brent,

Yes I did. Pictures show my starting point. Sadly no pic from end result. Sold the wheel because I wanted and still use cast wheels. Do not know exact weight either.

Cheers Rob
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Offline turboguzzi

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Re: Lightweight Rear
« Reply #3 on: October 22, 2016, 01:19:36 pm »
seen quite few like rob's when i started racing, the older guys told me it was common practice back in the day with sohcs. but havent seen one last few years... most hwire wheel people seem to go with motocross rear hubs

make sure that you add a separate bearing for the sporcket....


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Offline 754

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Re: Lightweight Rear
« Reply #4 on: October 22, 2016, 01:35:17 pm »
You can carve a lot of weight of the sideplates in post #2
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Offline slikwilli420

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Re: Lightweight Rear
« Reply #5 on: October 22, 2016, 01:49:13 pm »
Quote from: 754 on October 22, 2016, 01:35:17 pm
You can carve a lot of weight of the sideplates in post #2

Side plates of what frank?
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All you gotta do is do what you gotta do.

Vintage Speed Parts Mashup: http://forums.sohc4.net/index.php?topic=133638.0
Rickman CR Parts Kit Refresh: http://forums.sohc4.net/index.php/topic,154837.0.html
AHRMA CB750 Racer: http://forums.sohc4.net/index.php/topic,158461.0.html
AHRMA Superbike Heavyweight Racer: http://forums.sohc4.net/index.php/topic,173120.0.html
'76F CB750 Patina Redemption: http://forums.sohc4.net/index.php/topic,174871.0.html

Offline bwaller

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Re: Lightweight Rear
« Reply #6 on: October 22, 2016, 01:59:42 pm »
Thanks Rob, good to hear from you, do you remember what disc that was? I would look for as small a rotor as possible. I don't use the rear brake now unless I needed some stability, not for braking power because it was useless!

It would be great to know weights before sourcing parts. Certainly the hub etc will be much lighter but add a rotor, master cylinder, etc. how much less.

TG, any of those hubs use a disc rotor pre 78? I'm looking for one but no luck, maybe I'll just stick to a drum.

As much as I like my WM shouldered rims, I would lace up an MT rim instead & run tubeless eliminating an extra 1.5 lbs also.



« Last Edit: October 22, 2016, 02:12:33 pm by bwaller »
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Offline 754

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Re: Lightweight Rear
« Reply #7 on: October 22, 2016, 02:37:02 pm »
Disc and rotor carrier..aka..sideplates..
Huge selection of offsets and sprocket, rotors etc acvailable for dirttrack hubs, if you get lucky you can find used ones. Look for quick change barnes wheels ,Cheney, A&A,Kosman etc, and others, some show up used in dragracing parts, often they do not use knockoff portion, they just bolt them on.
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Lost quite a few CB 750's along the way

Offline RAFster122s

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Re: Lightweight Rear
« Reply #8 on: October 22, 2016, 02:43:59 pm »
You can skim the material between the spoke hubs to remove a bit of material without affecting the weight much but the looks a lot...
Dual pot Honda caliper could provide enough braking without massive amount...they work well with sinistered pads.  Would be an inexpensive rout. Can weigh a caliper for you as I have one I am working on...
I like Vox's setup, unconventional but the spoke lacing could be a pain on wider rim...lots of dish on one side... Would a Harley front hub be usable on the rear given its wider spacing...?
Different twist on the idea.  Is front 750 hub wider?  How modern a hub can you use?

Would a rear period alloy be out of the equation... I know, not as attractive as spoked but it could solve some of the issues if you can find a set to give you the width needed.  How much room do you have to play with on your rear swing arm and still have things aligned for sprockets, etc.  Don't want to "solve" one issue and create another.

Watching with interest...
David
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Offline simon#42

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Re: Lightweight Rear
« Reply #9 on: October 22, 2016, 03:17:14 pm »
Quote from: bwaller on October 22, 2016, 01:59:42 pm
Thanks Rob, good to hear from you, do you remember what disc that was? I would look for as small a rotor as possible. I don't use the rear brake now unless I needed some stability, not for braking power because it was useless!

It would be great to know weights before sourcing parts. Certainly the hub etc will be much lighter but add a rotor, master cylinder, etc. how much less.

TG, any of those hubs use a disc rotor pre 78? I'm looking for one but no luck, maybe I'll just stick to a drum.

As much as I like my WM shouldered rims, I would lace up an MT rim instead & run tubeless eliminating an extra 1.5 lbs also.





i never used the rear brake either so made them from alloy and had them anodised , saved quite a lot of weight and you could still use it to get yourself out of trouble in an emergency .
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Offline Medyo Bastos

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Re: Lightweight Rear
« Reply #10 on: October 22, 2016, 04:10:02 pm »
No such thing as lightweight rears in memphis


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Offline voxonda

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Re: Lightweight Rear
« Reply #11 on: October 24, 2016, 02:53:59 am »
This was one of my early setups. the sprocket carrier and the disk, from Brembo as used on Voxan, Ducati, where lightened. Disk diametre was 240m/m. Used a caliper from brembo used on scooters.Had a WM5(3.00")rim laced to it.
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Offline RAFster122s

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Re: Lightweight Rear
« Reply #12 on: November 17, 2016, 10:47:47 pm »
Brent,  have you fabbed anything up to test?
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Offline MoMo

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Re: Lightweight Rear
« Reply #13 on: November 18, 2016, 06:01:34 am »
You don't mean like this, do you?



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