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Author Topic: 74 CB550 Rear Wheel Size?  (Read 3471 times)

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Offline Sox Fan

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74 CB550 Rear Wheel Size?
« on: April 23, 2016, 07:17:30 AM »
Ordered tires for my 74 CB550 and the rear tire is too big for the rear wheel I have. Everywhere I looked online said the rear wheel is 18" on these bikes. Ordered an 18 x 4.00 tire and I am guessing now that I have a 16" or 17" rear wheel?

Already removed and tossed the old tires so can't look at the tire to get a size.

Did CB550s come with different rear wheel size options or did some previous owner put a non stock wheel on this bike? Here's a pic of the wheel.
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Offline grcamna2

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Re: 74 CB550 Rear Wheel Size?
« Reply #1 on: April 23, 2016, 07:23:39 AM »
That does look like a 16" rim which will take a 130/90-16.Do you see any stamped numbers on the rim itself ?

The other tire number that fits from back then was MT90-16
« Last Edit: April 23, 2016, 10:35:15 AM by grcamna2 »
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75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline Sox Fan

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Re: 74 CB550 Rear Wheel Size?
« Reply #2 on: April 23, 2016, 07:59:38 AM »
No markings on it. it measures 4" wide. Running a tape across the wheel it measures 17 3/8". I think I have a 16" x 4" wheel?

Did some searching and it sounds like this was a mod some people did back in the day?

Would prefer the 18" rear wheel but already had this one powdercoated so will see if I can find a tire to fit.
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Offline SOHC4 Cafe Racer Fan

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Re: 74 CB550 Rear Wheel Size?
« Reply #3 on: April 23, 2016, 11:21:01 PM »
That's not a stock sized wheel.
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline 700504

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Re: 74 CB550 Rear Wheel Size?
« Reply #4 on: April 24, 2016, 01:41:28 PM »
I acquired a 550 with the same set up; 16 harley rim laced to honda hub, mine came with an avon mkII on it.
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Offline Sox Fan

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Re: 74 CB550 Rear Wheel Size?
« Reply #5 on: April 25, 2016, 09:51:08 AM »
OK - so it looks like a 130/90-16 or 5.00 x 16" tire should fit?

Thanks for all the responses.
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Offline grcamna2

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Re: 74 CB550 Rear Wheel Size?
« Reply #6 on: April 25, 2016, 10:02:37 AM »
You could put a nice Avon RoadRider 130/90x16 on it.
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75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline 700504

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Re: 74 CB550 Rear Wheel Size?
« Reply #7 on: April 25, 2016, 02:28:21 PM »
Quote from: Sox Fan on April 25, 2016, 09:51:08 AM
OK - so it looks like a 130/90-16 or 5.00 x 16" tire should fit?

Thanks for all the responses.

Correct, if you look on Avon's website they have charts for this. They list the minimum and maximum rim width that the tire will tolerate, all being 16 in diameter.
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Offline Stev-o

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Re: 74 CB550 Rear Wheel Size?
« Reply #8 on: April 25, 2016, 04:36:45 PM »
I'd put an 18' wheel on there.  It will handle better plus it wont have the large gap between the tire and fender [if all else is stock]
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Offline Gene

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Re: 74 CB550 Rear Wheel Size?
« Reply #9 on: April 25, 2016, 04:58:26 PM »
Quote from: Stev-o on April 25, 2016, 04:36:45 PM
I'd put an 18' wheel on there.  It will handle better plus it wont have the large gap between the tire and fender [if all else is stock]

Stick some of those firestone balloon tires on there and there won't be a gap. . .  BUT SERIOUSLY - DON"T GET THOSE BALLOON TIRES!  I'm only joking around - that's a tiny wheel though.
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Offline grcamna2

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Re: 74 CB550 Rear Wheel Size?
« Reply #10 on: April 25, 2016, 05:08:37 PM »
Quote from: Stev-o on April 25, 2016, 04:36:45 PM
I'd put an 18' wheel on there.  It will handle better plus it wont have the large gap between the tire and fender [if all else is stock]

+1
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75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline SOHC4 Cafe Racer Fan

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Re: 74 CB550 Rear Wheel Size?
« Reply #11 on: April 25, 2016, 11:31:17 PM »
Quote from: grcamna2 on April 25, 2016, 05:08:37 PM
Quote from: Stev-o on April 25, 2016, 04:36:45 PM
I'd put an 18' wheel on there.  It will handle better plus it wont have the large gap between the tire and fender [if all else is stock]

+1
++++1
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold
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