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Offline Beau’s Bar and Garage

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Wheels
« on: September 20, 2021, 09:18:05 AM »
Hello

    I am in search of mag wheels for 1978 Honda 750 i think K
Will only certain mag wheels off cb750s work?  I have spoke wheels and i just don't understand spokes well.  One is broken and popped tire.  Need assistance
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Offline bryanj

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Re: Wheels
« Reply #1 on: September 20, 2021, 09:29:49 AM »
Mags were never standard and are not that common used, you will need to find a rear for your exact model to guarantee use of your brakeplate, spindle, spacers etc. Fronts are more standard
Spokes are easy if you do them right, if you want to pm me i will run you through it, dont forget i am in uk
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

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Offline Beau’s Bar and Garage

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Re: Wheels
« Reply #2 on: September 20, 2021, 09:47:44 AM »
Should I just get new spokes and relace my current wheel?  I should prolly do front and rear
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Offline Stev-o

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Re: Wheels
« Reply #3 on: September 20, 2021, 10:06:36 AM »
The later F models came with Comstars which is a type of mag. 

https://www.ebay.com/itm/274940170680?fits=Model%3ACB750F&epid=1040350551&hash=item4003b611b8:g:eBQAAOSwBmRhOhYj

A lot of guys like the Lester mags, they are a vintage wheel that are hard to find and pricey, there is also HA...

https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=lester+mag+cb750&_sacat=0&LH_TitleDesc=0&_odkw=lester+mag&_osacat=0


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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline goodtryer

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Re: Wheels
« Reply #4 on: September 20, 2021, 11:12:21 AM »
I recently did a set of spoke wheels for the first time ever. It's like a lot of things on these bikes; intimidating at first but actually pretty easy once you watch a couple of videos and read a couple of different descriptions. Also, don't forget to take at least 100 pictures of your wheels before you break them down.

I did the have the advantage of having another set of wheels to refer to during the process but I don't think that's critical. My $.02 contribution is that if you find yourself stretching or pulling or needing to bend something to get it into place, stop! Something is off and even if you get that one into place, the next one will be harder. Don't be afraid to undo and start over.

If you take on the job yourself, you'll need a truing/balancing stand. I bought the BikeMaster but it's also simple to construct one.

Good luck!
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"Tolerance will reach such a level that intelligent people will be banned from thinking so as not to offend the imbeciles."
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1977 CB550K
1978 CB750K
1973 CB500K

Offline MauiK3

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Re: Wheels
« Reply #5 on: September 20, 2021, 02:56:06 PM »
Have some good music going and bring on the patience
It’s not that hard, just time consuming
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1973 CB 750 K3
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Offline Beau’s Bar and Garage

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Re: Wheels
« Reply #6 on: September 20, 2021, 04:08:35 PM »
I have a 140/80/17. What tube do i need?  Geez there are a lot of them
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Offline TwoTired

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Re: Wheels
« Reply #7 on: September 20, 2021, 04:23:36 PM »
Quote from: Beau’s Bar and Garage on September 20, 2021, 04:08:35 PM
I have a 140/80/17. What tube do i need?  Geez there are a lot of them

Gonna need a wide wheel for that one.
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

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Offline slikwilli420

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Re: Wheels
« Reply #8 on: September 21, 2021, 06:32:53 AM »
Quote from: Beau’s Bar and Garage on September 20, 2021, 04:08:35 PM
I have a 140/80/17. What tube do i need?  Geez there are a lot of them

Simple. Match the tire width to the wheel width so it fits properly, and match the tube to the tire you end up choosing.
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All you gotta do is do what you gotta do.

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Offline samm_j2

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Re: Wheels
« Reply #9 on: September 21, 2021, 08:33:40 AM »
If you need a rear mag set up for a late model F I have one I no longer need... I know you said k but you did not seem sure
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Offline RAFster122s

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Re: Wheels
« Reply #10 on: September 21, 2021, 09:20:27 AM »
Isn't a 140 too big for stock 750 wheels. You will need a 140-17 tube if you fit that to a 17" wheel. You must be looking at Harley rims fit to spoked hub if looking to fit a 140-17.

Personally I like the handling of stock sized tires.
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Offline 754

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Re: Wheels
« Reply #11 on: September 21, 2021, 10:24:57 AM »
4vthings that help the most..
 Take pics and notes of if inners cross each other or same way..  take notes., and note cross pattern.
 Make  a carboard template of 2 adjacent spokes to show angle , between the 2 .. like maybe 120 degrees on front. This way you may get it right.. first try.
 Record any rim offset and what you measured from.
  You can use your swingarm or firks for truing. Knitting needles and pencils , and rubber bands are your friends when doing this..
 Good luck.. and have a drink after... not  during..
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Offline pekingduck

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Re: Wheels
« Reply #12 on: September 21, 2021, 11:10:43 AM »
A 1977-78 CB750K has a 17" rear wheel with a wide rim.  The 140/80x17 tire is very close to the size of the stock 4.50x17.  The size on the tube box might say 4.50/5.10 x 17, 140/80-17, 150/70-17 - any would fit.  Make sure it says it has a TR-4 valve stem, which is metal and not rubber.

If you have not changed tires before, I would recommend taking the wheel or bike to a dealer and let them inspect the spokes, install the tube and tire, and balance the wheel.  Ask and watch, as it is so easy to pinch the tube when installing it - everyone does it at least once.

As far as cast wheels, the 1978 CB750 Automatic has "mag-style" Comstar wheels and should bolt right up if you also use its front brake disc.

« Last Edit: September 21, 2021, 01:29:10 PM by pekingduck »
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