Author Topic: 1975 Honda CB750F SS Considering Rim Mod with GL1000 Rims  (Read 2308 times)

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Offline kaptainkid1

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1975 Honda CB750F SS Considering Rim Mod with GL1000 Rims
« on: October 17, 2018, 01:08:11 PM »
Everyone,

So I'm considering changing out my stainless steel stock rims and modding them to fit the aluminum rims of from a 1976 Honda GL1000. So here are the following concerns:
1. Will the rims be a direct fit? I assume the spokes will lace up no problems?
2. Can the CB750F rear subframe run the larger tire and smaller rim with no rubbing issue?
3. Are there better tire options and brands for R17 rear rim? Is this true?
4. Will I feel better performance with the light rims? Is this a myth?
The reason why I'm considering these mods are my rims are heavy and I've seen other riders run Aluminum rims to lighten up the bike weight.
I've done a few upgrades to my CB750F and wanted to know will these rim changes be a waste of time or will I feel a difference in performance?
Would this mod an be an upgrade?
Another reason why I consider this mod is my current chrome rims is showing a little rust due to age and I know I can polish out these Aluminum rims to an awesome shine.
What do you guys think?
 
So the original rims are:
1975 Honda CB750F SS
100/90-R19 (3.50-19)
120/90-R18 (4.00-18)

1976 Honda GL1000 Rims:
100/90-R19 (3.50-19)
130/90-R17 (4.50-17)
1975 Honda CB750F Daily Rider      
1974 BMW R90S Barn Find
1995 BMW R1100GS Dual Sport Daily
1996 Triumph 900 Adventurer Bobber

Offline Bankerdanny

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Re: 1975 Honda CB750F SS Considering Rim Mod with GL1000 Rims
« Reply #1 on: October 17, 2018, 02:42:43 PM »
The front is a direct fit, in fact the whole wheel will just bolt on, you just need to swap the brake rotor and the plate on the right side of your 750 wheel that fills in part of the space where the 2nd rotor is on the GL.

The back is an easy swap too. You can use stock length GL1000 spokes to lace up to the F hub.

SeanBarney swapped gold GL1000LTD rims onto his '75 I believe. I believe that the 130/90-17 has a similar diameter as the 4.00-18, so the stock GL size tire should work just fine.
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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 seanbarney41

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Re: 1975 Honda CB750F SS Considering Rim Mod with GL1000 Rims
« Reply #2 on: October 17, 2018, 03:48:03 PM »
Yup, Danny is right on here.
20180930_141257 by Sean Barney, on Flickr
But actually, I found that a 130/90/17 Pirelli Sport Demon is actually taller than the stock 4.00x18 which, combined with the longer rear shocks I was running, resulted in mild head shake when decelerating on bumpy surfaces.  I just switched to a 130/80/17 Avon Roadrider rear and 3.25x19 matching front and have solid stability back.  This bike handles excellent with this combination.

You probably won't find drastic improvements in acceleration or quicker lap times but wheel upgrades really do make your bike ride noticeably better and yes I do think the GL1000 wheels are an upgrade from the stock steelies.  The GL wheels can often be had for very economical prices as well.
If it works good, it looks good...

Offline kaptainkid1

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Re: 1975 Honda CB750F SS Considering Rim Mod with GL1000 Rims
« Reply #3 on: October 18, 2018, 05:18:13 PM »
Nice 75 ss. I have the exact same one in orange. I have pair of stock GL rims and wasn't sure if it would be the worth headache on installing the new rims. I like the gold look and hope i can polish these oxide rims to look sweet. Did u notice any difference after you installed them. Or is it just looks that made the difference?
1975 Honda CB750F Daily Rider      
1974 BMW R90S Barn Find
1995 BMW R1100GS Dual Sport Daily
1996 Triumph 900 Adventurer Bobber

Offline 754

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Re: 1975 Honda CB750F SS Considering Rim Mod with GL1000 Rims
« Reply #4 on: October 18, 2018, 06:44:45 PM »
 The silver ones are anodized clear.
 I picked up a pair  about 10 days ago for 40 bux, they got some nicks and gouges but hey a pair of rims are worth 40 bux. The are going on a 78 K 750 my son Vinnie got. His were rusty.
 They  are not my favorite alloy rims, but way better than  rusty chrome ones.
Maker of the WELDLESS 750 Frame Kit
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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 seanbarney41

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Re: 1975 Honda CB750F SS Considering Rim Mod with GL1000 Rims
« Reply #5 on: October 18, 2018, 06:57:24 PM »
Nice 75 ss. I have the exact same one in orange. I have pair of stock GL rims and wasn't sure if it would be the worth headache on installing the new rims. I like the gold look and hope i can polish these oxide rims to look sweet. Did u notice any difference after you installed them. Or is it just looks that made the difference?
Well, yeah I did notice a huge difference as both original rims were extremely out of true and the bike bounced all over the road at 40mph...and this is commonly what you find, at least to some extent, when you pick up these old project bikes.  Of course any spoke problems or damage gets magnified by their excessive weight.  I feel like stock steel wheels is one of the few areas where 1970's japanese motorcycle company's really chose to build to a price point instead of engineering something more high quality and performance oriented.

I bought these wheels at a swap meet for $30.  I really enjoyed lacing and trueing the back wheel, although I did have expert help from a friend.  It was the first wheel I ever built and it has been holding up well after 5000 miles or so.   And the front is an easy bolt on.

The hardest part about polishing those GL rims is dealing with the front spokes, as there is no reason to tear the wheel down.  And they are clear coated with a very tough coating.  It will have to be stripped somehow before they can be polished.  I just cleaned mine up as best I could with regular automotive rubbing compound.  They were still in pretty nice shape.
If it works good, it looks good...

Offline 754

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Re: 1975 Honda CB750F SS Considering Rim Mod with GL1000 Rims
« Reply #6 on: October 18, 2018, 08:34:38 PM »
They are anodized, far as I know.
 I think oven cleaner will strip it.
 Downside is then you got to keep polishing.
 
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 seanbarney41

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Re: 1975 Honda CB750F SS Considering Rim Mod with GL1000 Rims
« Reply #7 on: October 19, 2018, 02:48:48 AM »
You are probably right, frank
If it works good, it looks good...