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Author Topic: UNUSUAL BRAKE DISC I.D.???  (Read 1437 times)

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Offline 736cc

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UNUSUAL BRAKE DISC I.D.???
« on: April 02, 2009, 12:48:56 PM »
These have ALOT of custom machining done to them. Don't fit a CB750 hub (too small) and has 5 bolt holes. Only clue I have is owner told me they were on an aftermarket mag wheel unknown brand. 1970's era.
  Any good guesses?
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Offline robe0531

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Re: UNUSUAL BRAKE DISC I.D.???
« Reply #1 on: April 02, 2009, 12:55:45 PM »
maybe a lester or invader
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Offline cafe750

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Re: UNUSUAL BRAKE DISC I.D.???
« Reply #2 on: April 02, 2009, 01:03:28 PM »
Those  look like they'd fit an airhead beemer....if you're looking to get rid of them, I'd have a happy home for 'em... ;)
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Offline bryanj

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Re: UNUSUAL BRAKE DISC I.D.???
« Reply #3 on: April 02, 2009, 03:40:55 PM »
5 bolts could be 77/78 F
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Offline JLeather

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Re: UNUSUAL BRAKE DISC I.D.???
« Reply #4 on: April 02, 2009, 05:20:52 PM »
Yeah, I was just gonna say they looked like they'd fit a Comstar.
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Offline 754

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Re: UNUSUAL BRAKE DISC I.D.???
« Reply #5 on: April 02, 2009, 07:33:49 PM »
They look like Mark Zero's

 Can you take a chord measurement  (c-to-c across 2 bolt holes)
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Maker of the WELDLESS 750 Frame Kit
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Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline 736cc

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Re: UNUSUAL BRAKE DISC I.D.???
« Reply #6 on: April 03, 2009, 12:29:37 PM »
11" (278mm) overall disc diameter

2 1/2" (57mm) disc center opening

1 3/4" (45mm) center distance between adjacent bolt holes

2 7/8" (73mm) center distance between every other bolt holes

Who...is Mark Zero??
« Last Edit: April 03, 2009, 01:57:53 PM by 736cc »
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Offline Geeto67

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Re: UNUSUAL BRAKE DISC I.D.???
« Reply #7 on: April 03, 2009, 01:56:03 PM »
How big is the overall diameter? Could be for a dyson hub like the ones Dunstall used to use for the domiracers.

Edit: 11" I think is too big for the early dyson hubs. I will look at the set I have at home and see.
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Offline 754

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Re: UNUSUAL BRAKE DISC I.D.???
« Reply #8 on: April 03, 2009, 07:55:23 PM »
Mark Zero  Ent. made brakes in the70,s.

Most of the wheel makers did not.

Halsraft did for their wire wheels, so did Rickmam, but most makers of mags did not.
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Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline 736cc

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Re: UNUSUAL BRAKE DISC I.D.???
« Reply #9 on: April 05, 2009, 11:41:42 AM »
So can anybody determine if these fit 77/78 comstars?
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Offline Ricky_Racer

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Re: UNUSUAL BRAKE DISC I.D.???
« Reply #10 on: April 05, 2009, 01:15:53 PM »

Okay, I'll see if I can lend some light on these. They are by Mark-O. The fitment is custom. The last set that came up on eBay (item 180321669689 end time  Jan-24) sold for $45. I know because my sniping software was a couple seconds off and I missed the bid.

If you're going to sell them, since I could still use a set for a custom application, I'm calling dibs. PM me if you want to discuss it. Thanks. RR

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Offline 754

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Re: UNUSUAL BRAKE DISC I.D.???
« Reply #11 on: April 05, 2009, 09:14:25 PM »
A Ha !!

 I figured RR had mentioned them before..


 I think they were one of the very first custom brake discs on the market..
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Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline JLeather

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Re: UNUSUAL BRAKE DISC I.D.???
« Reply #12 on: April 06, 2009, 04:10:42 AM »
I'll try and make myself remember to measure a Comstar rotor when I get home unless someone beats me to it.
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Offline JLeather

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Re: UNUSUAL BRAKE DISC I.D.???
« Reply #13 on: April 07, 2009, 04:03:45 PM »
Ok.  A comstar rotor is as follows:

10 7/8" Outer Diameter (close enough to 11")

2.300" Disc Center Opening

1.185" Center Distance between adjacent bolt holes

Guess it's not from a Comstar.  It could be an 80's suzuki wheel, they were 5-hole rotor.
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