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Author Topic: 1978 CB 750 stock wheels  (Read 2196 times)

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Offline Wbflyer

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1978 CB 750 stock wheels
« on: May 31, 2018, 10:29:46 AM »
Looking for new tires on stock wheels.  Looking at 140/80 17 and 120/90 19.  any issues with this setup that you can see?
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Offline ef9tuning

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Re: 1978 CB 750 stock wheels
« Reply #1 on: May 31, 2018, 11:18:10 AM »
I believe that's the correct rear size. Front is 110-90-19 on my 78. I can confirm this for you when I get home later.
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Offline Bankerdanny

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Re: 1978 CB 750 stock wheels
« Reply #2 on: May 31, 2018, 11:30:38 AM »
Both of those would be wider than stock. They likely will fit, but confirm your rim widths (look on the rim near the tube valve stem hole, then check the manufacturer's site for the minimum widths. The front is a 1.85" and I typically run a 100/90 on the front of my bikes with stock wheels.
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"The problem with quotes on the Internet is that you never know if they're true" - Abraham Lincoln

Current: '76 CB750F. Previous:  '75 CB550F, 2007 Yamaha Vino 125 Scooter, '75 Harley FXE Superglide, '77 GL1000, '77 CB550k, '68 Suzuki K10 80, '68 Yamaha YR2, '69 BMW R69S, '71 Honda SL175, '02 Royal Enfield Bullet 500, '89 Yamaha FJ1200

Offline Wbflyer

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Re: 1978 CB 750 stock wheels
« Reply #3 on: May 31, 2018, 12:23:59 PM »
Ok, I want to run a little wider tire in front and back.  Is 120 too wide for front?  I heard 140 will fit without any issues but no wider.  Going with Shinko's
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Offline seanbarney41

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Re: 1978 CB 750 stock wheels
« Reply #4 on: May 31, 2018, 04:17:52 PM »
120 is certainly gonna be a #$%* to get in there and it may not even clear...it's gonna steer like a truck with no power steering too
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If it works good, it looks good...

Offline Handlebar

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Re: 1978 CB 750 stock wheels
« Reply #5 on: May 31, 2018, 04:41:22 PM »
Just as seanbarney said. 120 is a very tight front. I run 120 rear and 100 front Shinko 712s on a 78ss and it handles well. Just my 2cents.
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Offline Bankerdanny

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Re: 1978 CB 750 stock wheels
« Reply #6 on: May 31, 2018, 07:03:28 PM »
Whatever improvement in looks you think you will get with the wider tires you will give back in actual handling. Don't go wider than 110 up front. Personally I went with stock inch sizes on my 750F, which is 19 front/18 rear with Metzlers.

My 550F, which had Lester alloys on it (I switched to wires recently because I am selling it) has 100/90-10 front and 110/90-18 rear Shinko 712's. Both the front and rear Lesters are 2.15" wide. The wires are both 1.85.
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"The problem with quotes on the Internet is that you never know if they're true" - Abraham Lincoln

Current: '76 CB750F. Previous:  '75 CB550F, 2007 Yamaha Vino 125 Scooter, '75 Harley FXE Superglide, '77 GL1000, '77 CB550k, '68 Suzuki K10 80, '68 Yamaha YR2, '69 BMW R69S, '71 Honda SL175, '02 Royal Enfield Bullet 500, '89 Yamaha FJ1200

Offline ef9tuning

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Re: 1978 CB 750 stock wheels
« Reply #7 on: June 01, 2018, 05:50:14 AM »
I was able to confirm I am running 100 up front. Ordered a replacement Shinko tire months ago it was the wrong size, 110 I believe. Already had the front wheel off and the 110 is a super tight squeeze when I checked fitment.
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1978 CB750K

Offline 754

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Re: 1978 CB 750 stock wheels
« Reply #8 on: June 01, 2018, 07:57:18 AM »
 110 on my 74 needs a lot of grunt to get in or out and it rubs hard on my brake line older loop.  On a 74.
 I bet it will be tight on yours.
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Maker of the WELDLESS 750 Frame Kit
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Kelowna B.C.       Canada

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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 flybox1

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Re: 1978 CB 750 stock wheels
« Reply #9 on: June 01, 2018, 08:53:10 AM »
..and if youre planning on a dual front rotor setup with 110 or larger? fuhgeddaboudit!
100 front and 120 rear.  Any bigger and your turn-in will be slow.
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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: 1978 CB 750 stock wheels
« Reply #10 on: June 01, 2018, 12:55:16 PM »
Ok, I will just stick to the 120 rear and 100 front.  Thanks guys!
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Offline Wbflyer

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Re: 1978 CB 750 stock wheels
« Reply #11 on: June 01, 2018, 01:09:36 PM »
well, I am now looking at Shinko 805's 110/80 front and 130/80 rear.  I read that someone had this setup and it worked with all stock rims, etc..
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Offline flybox1

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Re: 1978 CB 750 stock wheels
« Reply #12 on: June 01, 2018, 01:18:27 PM »
805's?!?!

sorry Wb, ya just killed it for me  :-\  lol  ;D
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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: 1978 CB 750 stock wheels
« Reply #13 on: June 01, 2018, 01:41:18 PM »
hahaaha, not a fan? :)  I am building a scrambler(ish) type bike for the mountain roads at Mt. Hood. 
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Offline flybox1

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Re: 1978 CB 750 stock wheels
« Reply #14 on: June 01, 2018, 02:27:22 PM »
Quote from: Wbflyer on June 01, 2018, 01:41:18 PM
... for the mountain roads at Mt. Hood.
...for that, its fine  8)
For beating the streets of Portlandia? Not so much.  :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: 1978 CB 750 stock wheels
« Reply #15 on: June 01, 2018, 02:56:52 PM »
agreed!
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Offline tanner709

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Re: 1978 CB 750 stock wheels
« Reply #16 on: September 20, 2018, 08:03:00 PM »
Did you go with the 805s wb? any pics/concerns or comments
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