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Author Topic: CB 750 TIRE SIZE  (Read 2851 times)

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Offline DIECER

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CB 750 TIRE SIZE
« on: June 03, 2012, 08:40:51 AM »
I couldn’t find the right answer in the forum,

Will a 140-70-18 tire fits in a 1974 CB750 with standard swing arm??  Pictures will really help !
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Offline wick

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Re: CB 750 TIRE SIZE
« Reply #1 on: August 06, 2012, 08:33:06 PM »
I'm lacing' up. That size now' 8)
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Offline wick

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Re: CB 750 TIRE SIZE
« Reply #2 on: August 07, 2012, 02:07:24 AM »
laced`balanced` mounted-` fits` nice` - you just need` to bow` your rear- drum`brake` bar- a little.`!@

140/70/18-- on a   4.25 wide- rim............
« Last Edit: August 08, 2012, 07:24:52 AM by wick »
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Offline Really?

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Re: CB 750 TIRE SIZE
« Reply #3 on: August 07, 2012, 07:55:30 AM »
I think I read it will fit (do not quote me) but you will have other things to deal with too (i.e. chain, brake stay, chain guard, sprockets...)  Know that you can do a 77/78K swinger in there if needed.  The extra (about) 3/4 of an inch in length will pull it away from the crown a bit giving it a bit extra room.

You may wield a better search result using 140/70-18   There are a few threads on this but note that they are mostly old ones but that should not matter.  Just know it is the older ones that will hold the better content.

I am doing that size or one bigger, I still have a little more study on that subject.  :)  I am going to have a box swinger made +2 so I know I will be fine in that matter.
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I don't have a motorcycle, sold it ('85 Yamaha Venture Royale).  Haven't had a CB750 for over 40 years.

The Wife's Bike - 750K5
The Kid's Bike - 750K3

Offline wick

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Re: CB 750 TIRE SIZE
« Reply #4 on: August 08, 2012, 07:23:14 AM »
 8)
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Offline MCRider

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Re: CB 750 TIRE SIZE
« Reply #5 on: August 08, 2012, 07:37:49 AM »
Quote from: DIECER on June 03, 2012, 08:40:51 AM
I couldn’t find the right answer in the forum,

Will a 140-70-18 tire fits in a 1974 CB750 with standard swing arm??  Pictures will really help !
Fouls the stock chainguard and brake stay rod.  FIX: Do away with shainguard and as mentioned, bow the stay, or move it to outside of the bracket.

Also, you can shoehorn it on the stock rim, but the stock rim should only go to a 120 size rear.  For a 140, you should use a wider rim.

I have a 140 on a 3.50 wide rim.
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1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
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Offline Duke McDukiedook

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Re: CB 750 TIRE SIZE
« Reply #6 on: August 08, 2012, 07:41:23 AM »
Yep, you need a wider rim for that size.
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Offline Really?

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Re: CB 750 TIRE SIZE
« Reply #7 on: August 08, 2012, 07:50:15 AM »
Hey wick, I have a few questions on what you have put together.  I am not as good as many people in seeing every detail in pictures like many on this forum, I am wondering what year swing arm you are running, are you using offset sprockets or a mix of a 10mm offset front sprocket and 77/78 sprocket carrier and how much clearance do you have between the chain and tire?  I am wondering if a 150/70-18 on at least a 4in rim (Bridgestone recommended rim width for that size) would comfortably clear the chain with the setup you have there.
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I don't have a motorcycle, sold it ('85 Yamaha Venture Royale).  Haven't had a CB750 for over 40 years.

The Wife's Bike - 750K5
The Kid's Bike - 750K3

Offline wick

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Re: CB 750 TIRE SIZE
« Reply #8 on: August 09, 2012, 06:48:20 AM »
my swing- arm and all offsets are stock-  front rear- sprocks` ext ext .`
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