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Author Topic: 78 CB750 rear wheel size  (Read 3713 times)

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Offline Wbflyer

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78 CB750 rear wheel size
« on: September 18, 2017, 08:29:22 PM »
Well, thanks to the search function I just realized that the rear wheel on my year went down to 17 from 18.  I will just buy a new rim but what rim?  how many holes does the stock hub need?

Thanks, sorry for all the posts.  I might be in over my head on this build but I am already $1500 into it. starting to freak out...
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Offline Wbflyer

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Re: 78 CB750 rear wheel size
« Reply #1 on: September 18, 2017, 08:41:15 PM »
I think I found my answer.  The rear is 40 spokes either 17 or 18 inch.  Correct? 
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Offline 754

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Re: 78 CB750 rear wheel size
« Reply #2 on: September 18, 2017, 09:33:19 PM »
17 inch  May be drop center rim.. get a length before ordering spokes. .
 The only thing I hate on them is the size is stamped in the side of the rim.
 One nice thing though , the brake arm that moves the shoes, looks pretty good, I cut the middle out on one, even nicer.
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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 Wbflyer

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Re: 78 CB750 rear wheel size
« Reply #3 on: September 18, 2017, 09:49:31 PM »
Gotcha so what again should I measure?
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Offline 754

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Re: 78 CB750 rear wheel size
« Reply #4 on: September 18, 2017, 09:53:37 PM »
Just measure spokes first, if you are ordering spokes, to make sure what you get will fit  your rim.
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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 Stev-o

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Re: 78 CB750 rear wheel size
« Reply #5 on: September 19, 2017, 07:17:03 AM »
Quote from: Wbflyer on September 18, 2017, 08:29:22 PM

I might be in over my head on this build but I am already $1500 into it. starting to freak out...

Only $1500?   Dont ever try restoring a Kawasaki Triple then!!

Yes, in '77-78 the CB750 had a 17" rear wheel and a 630 chain [larger than previous model]

If you are buying spokes, I suggest stainless sopkes from Buchanans, they cost a little more but worth it.

http://www.buchananspokes.com/categories/custom_spoke_sets.asp
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Wbflyer

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Re: 78 CB750 rear wheel size
« Reply #6 on: September 19, 2017, 11:07:18 AM »
Are there any issues on the 78 frame running a 18" tire? 
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Offline flybox1

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Re: 78 CB750 rear wheel size
« Reply #7 on: September 19, 2017, 11:16:56 AM »
Quote from: Wbflyer on September 19, 2017, 11:07:18 AM
Are there any issues on the 78 frame running a 18" tire?
YEAH....if you're running a 17" rim  ;D  :P
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Wbflyer

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Re: 78 CB750 rear wheel size
« Reply #8 on: September 19, 2017, 12:38:16 PM »
hahahaha, good point!  I mean 18" wheel.
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Offline Stev-o

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Re: 78 CB750 rear wheel size
« Reply #9 on: September 19, 2017, 01:33:06 PM »
Quote from: flybox1 on September 19, 2017, 11:16:56 AM
Quote from: Wbflyer on September 19, 2017, 11:07:18 AM
Are there any issues on the 78 frame running a 18" tire?
YEAH....if you're running a 17" rim  ;D  :P

Ha!!  Good one Fly....

Should not be a problem if you use the stock sprocket carrier.  Another K7-8 change was a longer output shaft on the motor...
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline flybox1

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Re: 78 CB750 rear wheel size
« Reply #10 on: September 19, 2017, 01:39:36 PM »
Quote from: Wbflyer on September 19, 2017, 12:38:16 PM
hahahaha, good point!  I mean 18" wheel.
shouldnt be an issue.  Lace them to the 17" hub..
stock 17" rims have a stepped center, so as stated, measure spoke length needed for the 18" before you order spokes
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Wbflyer

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Re: 78 CB750 rear wheel size
« Reply #11 on: September 19, 2017, 01:55:22 PM »
Ok will do! thanks!
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