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Author Topic: 120/90H18 on the rear of a '78F?  (Read 1576 times)

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Offline Leemata

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120/90H18 on the rear of a '78F?
« on: April 29, 2007, 06:26:09 AM »
Hey guys, this may of been asked before.  Will a 120/90H18 tire fit on the rear of a '78 Super Sport when the stock is a 110?  Thanks for any help.

Terry
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'78 CB750F, '72 Honda Z50, '74 Honda Z50, '78 Maico MC250, '98 Yamaha YZ250, '75 RD350B

"Ah yes, Harley Davidson.  You really have to give them credit.  They've managed to create a market in which they can sell yesterday's technology at tomorrow's prices." (Michael Kasmirsky)

liaudio

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Re: 120/90H18 on the rear of a '78F?
« Reply #1 on: April 29, 2007, 07:44:35 AM »
my K5 has a 130/80/18, my K6 has a 130/90/17, my K7 has a 130/90/17
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Offline SD750F

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Re: 120/90H18 on the rear of a '78F?
« Reply #2 on: April 29, 2007, 07:52:56 AM »
One size up (110 to a 120) is considered a safe bet all around... Two sizes up and you might have to worry about fit.

Scott

P.S. I am doing 110/90 19" on the front and 120/90 18" on the rear of my 1978 CB750 F3 Super Sport.
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eldar

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Re: 120/90H18 on the rear of a '78F?
« Reply #3 on: April 30, 2007, 06:39:09 AM »
Well we dont have it on this site and I am not home to check my manual but I thought all the 77/78 bikes had 17 inch rear wheels? The 77/78 also had a wider rim, at least the spoke rims were wider. I run a 130 on the back and it works great.
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Offline Leemata

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Re: 120/90H18 on the rear of a '78F?
« Reply #4 on: April 30, 2007, 09:03:52 AM »
I'm pretty sure 19" is stock on her.

Terry
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'78 CB750F, '72 Honda Z50, '74 Honda Z50, '78 Maico MC250, '98 Yamaha YZ250, '75 RD350B

"Ah yes, Harley Davidson.  You really have to give them credit.  They've managed to create a market in which they can sell yesterday's technology at tomorrow's prices." (Michael Kasmirsky)

eldar

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Re: 120/90H18 on the rear of a '78F?
« Reply #5 on: April 30, 2007, 09:18:51 AM »
On the front it is stock.  On all the 750s I think.  Now the rear is where small changes happened.
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Offline Leemata

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Re: 120/90H18 on the rear of a '78F?
« Reply #6 on: April 30, 2007, 09:27:22 AM »
Just went out and checked the owner's manual.  19" in the front......18" on the rear.

Terry
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'78 CB750F, '72 Honda Z50, '74 Honda Z50, '78 Maico MC250, '98 Yamaha YZ250, '75 RD350B

"Ah yes, Harley Davidson.  You really have to give them credit.  They've managed to create a market in which they can sell yesterday's technology at tomorrow's prices." (Michael Kasmirsky)

Offline Tim.

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Re: 120/90H18 on the rear of a '78F?
« Reply #7 on: April 30, 2007, 09:40:31 AM »
What's the width?  Should be stamped on the rim.
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Roule comme dans les années 70...   Roll as in the Seventies...

eldar

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Re: 120/90H18 on the rear of a '78F?
« Reply #8 on: April 30, 2007, 03:15:45 PM »
Ok I did not know the rim on the 78F. The site here only has the specs for the K bikes. and Since I am not at home, I could not pull up my manual. Well stock for my bike per the manual is 100/90-19 front and 120/90-17 rear. I have 1 step up on both and it works good. Many people here have done that and had good results. Being an F bike, I would say you could do 110/90-19 and 130/90-18 with little issue. However, it is your safety and I would say to check the manufacturers directly and find what they recommand and what works for their particular tire. That is the best way to do it. A little more work but the best always takes more work.
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Offline SD750F

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Re: 120/90H18 on the rear of a '78F?
« Reply #9 on: April 30, 2007, 05:14:19 PM »
Nope, my stock 1978 F3 is 18" for the rear...

Scott
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