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Author Topic: Tire size help!  (Read 375 times)

Offline nateb

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Tire size help!
« on: Jan 18, 2018, 22:48:41 »
Hey guys-So Iím building a 76 cb750. Iím lacing a 17Ē wheel in the rear. I can use either a 550 or 750 swingarm for the widest tire fit. I would like to run a 140 at least. What can be done?


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« Last Edit: Jan 18, 2018, 22:50:29 by nateb »

Offline Nebr_Rex

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Re: Tire size help!
« Reply #1 on: Jan 19, 2018, 21:39:00 »
http://www.buchananspokes.com/

So you think that SOHC 750 will need that much tire or is this an exercise in "curb appeal"?


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Offline Tim

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Re: Tire size help!
« Reply #2 on: Jan 19, 2018, 22:29:46 »
There are a few tables out there (Avon has one) to suggest tire:rim width combinations.

But it sounds like you're not sure if a 140 tire will fit in the CB750 swingarm?  It might.  From what I recall, 130 is tight and might rub the chain guard.
"Quality . . . you know what it is, yet you don't know what it is. But that's self-contradictory. But some things are better than others, that is, they have more quality. But when you try to say what the quality is, apart from the things that have it, it all goes poof! There's nothing to talk about. But if you can't say what Quality is, how do you know what it is, or how do you know that it even exists? If no one knows what it is, then for all practical purposes it doesn't exist at all. But for all practical purposes it really does exist."

Offline nateb

  • Posts: 105
Re: Tire size help!
« Reply #3 on: Jan 20, 2018, 14:25:08 »
There are a few tables out there (Avon has one) to suggest tire:rim width combinations.

But it sounds like you're not sure if a 140 tire will fit in the CB750 swingarm?  It might.  From what I recall, 130 is tight and might rub the chain guard.
Thanks for the responses fellas, Iíve decided to use the 550 swingarm in the 750 frame. It looks better to me visually because or itís rounded tubular swingarm. Where the 750 swingarm is kinda ďboxyĒ. And yes this is absolutely about appeal. Iím using a 2001 gsxr 1000 front end.


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Offline WhyNot

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Re: Tire size help!
« Reply #4 on: Jan 20, 2018, 16:16:29 »
Tires are like oil.....................eh..!!!

I'm am about to change my 750 to a swingarm from a 550, due to exactly as you said........the roundness look it has, plus, it's a little longer to help lower it some.
2006 Harley Davidson Heritage Softail
1975 Honda CB750K5 needs carb work
1974 Honda CB350F2 needs tins painted (being lazy)
1972 Honda CB175K2 roller no engine
1972 Honda CB/CL350 Engines need roller
1972 Honda SL350K2 Frame for above engine
1972 Honda CB100K2 needs kicker shaft
1990 Mitsubishi MM needs engine rebuild
1984 Dodge D50 Beater DD since 1997

Offline nateb

  • Posts: 105
Re: Tire size help!
« Reply #5 on: Jan 22, 2018, 00:55:55 »
Tires are like oil.....................eh..!!!

I'm am about to change my 750 to a swingarm from a 550, due to exactly as you said........the roundness look it has, plus, it's a little longer to help lower it some.
Thatís totally what Iím going for. As I mentioned, Iím using a gsxr 1000 front end which will lower it as well. The motor Iím using for this build is a stock 10k mile engine from a 73 750. It has beautiful compression and doesnít leak so Iím doing nothing to it besides painting, polishing, and perhaps a re jet to accommodate velocity stacks and a 4/1 header. Iíll put an electronic ignition in too. I think with a stock motor pretty much, there is no need for a huge rear tire. I want to ride it not drag race it. I think a 140 rear on a 17Ē wheel will look great in a 550 swingarm. Then I get the same 17 x 2.50 wheel, lace it to Cognitos 40 hole hub adapter for a Suzuki fork. Btw Iím using Honda wheels. I looked at all my options and found I can source 40 hole 17Ē aluminum wheels from a hondamatic 750 rear or a mid 70s goldwing rear cheaper that any other 17/2.50. And Iím just going to powder coat them black.


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Offline WhyNot

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Re: Tire size help!
« Reply #6 on: Jan 22, 2018, 07:00:56 »
Thatís totally what Iím going for. As I mentioned, Iím using a gsxr 1000 front end which will lower it as well. The motor Iím using for this build is a stock 10k mile engine from a 73 750. It has beautiful compression and doesnít leak so Iím doing nothing to it besides painting, polishing, and perhaps a re jet to accommodate velocity stacks and a 4/1 header. Iíll put an electronic ignition in too. I think with a stock motor pretty much, there is no need for a huge rear tire. I want to ride it not drag race it. I think a 140 rear on a 17Ē wheel will look great in a 550 swingarm. Then I get the same 17 x 2.50 wheel, lace it to Cognitos 40 hole hub adapter for a Suzuki fork. Btw Iím using Honda wheels. I looked at all my options and found I can source 40 hole 17Ē aluminum wheels from a hondamatic 750 rear or a mid 70s goldwing rear cheaper that any other 17/2.50. And Iím just going to powder coat them black.


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Got a build thread?

Are you documenting the stuff you said?

Be nice to see how all of it looks.

I'm using the 550 front forks as well to get a little lower in front.

Haven't done it yet, need to get my carbs straighten out first.
2006 Harley Davidson Heritage Softail
1975 Honda CB750K5 needs carb work
1974 Honda CB350F2 needs tins painted (being lazy)
1972 Honda CB175K2 roller no engine
1972 Honda CB/CL350 Engines need roller
1972 Honda SL350K2 Frame for above engine
1972 Honda CB100K2 needs kicker shaft
1990 Mitsubishi MM needs engine rebuild
1984 Dodge D50 Beater DD since 1997

Offline nateb

  • Posts: 105
Re: Tire size help!
« Reply #7 on: Feb 06, 2018, 16:56:05 »
Cb750 cafe build
http://www.dotheton.com/forum/index.php?topic=75160


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