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Hey everyone , I recently purchased a 1979 cb750 limited edition and I've run into an issue . I ordered an Avon Roadrider AM26 Tire(Wheel Location: Rear / Tire Size: 120/90-17 64V)
The shop I took it to couldn't get it on my rim after much effort . The tire previously on it was a 4.50 17 r.
What did I do wrong ? Also is the 79 limited edition 17 inch comstar tubeless or not ? I ordered from revzilla so return is no problem just a pain .
Are there any other models on said site that you would interchange for ?
Thanks in advance for any help
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Administrator
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That tire seems a little narrow for that bike, but should have went on.  Did anyone double check the tire size? You could have been shipped the wrong tire. Or I would question the shops ability to change tires. As for needing a tube, no you should not need one with the comstar wheel.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."
1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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The tire is the same as listed above so they sent the right one. One thing I noticed on it is that it's mountable as a front or rear. Has arrows like this <-->
They were able to get it on the rim it just wouldn't "bead"
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Administrator
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It was too narrow then. You need at least a 130/90/17 REAR tire.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."
1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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Thanks for the quick response! Hopefully I can get this new tire by wednesday....ive got the itch
I think I've decided to keep it pretty original seeing as its the limited editon and I have my 350f ( in the background) to brat out . 
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Hi. Just for information, Honda made two types of Comstar wheel - One was designed for Tubeless tyres (CX500 etc) but the other type had to run tubes. Your (and mine) CB750L wheels need tubes. Apparently the valve hole is different and the rim flanges will not secure a tubeless tyre safely.
Maz
'76 CB500T
'75 GL1000 'Wing
'79 CB750L
'90 FJ1200
'93 GS500E
In a little place called Bexley, Kent, UK (Just south of London!)
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Great info!
Sent from my iPhone
On Jul 9, 2016, at 10:16 AM, Maz [via Honda CB750'S] < [hidden email]> wrote:
Hi. Just for information, Honda made two types of Comstar wheel - One was designed for Tubeless tyres (CX500 etc) but the other type had to run tubes. Your (and mine) CB750L wheels need tubes. Apparently the valve hole is different and the rim flanges
will not secure a tubeless tyre safely.
Maz
'76 CB500T
'75 GL1000 'Wing
'79 CB750L
'90 FJ1200
In a little place called Bexley, Kent, UK (Just south of London!)
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Administrator
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Comstars should be marked whether they are tubeless or not.
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So I got my new tire in (130/90 17) took it back to the same shop and they where still unable to bead it with a tube. So the mechanic put a metal stem in it and it went right on. It seems to be fine tubeless but after reading that it shouldn't be here
it's making me nervous about not having one. Are there any identifying marks that would show if it's really a tubeless rim?
Also it seems fishy to me that it would go on with not tube but not with one.
Sent from my iPhone
On Jul 10, 2016, at 8:36 PM, shinyribs [via Honda CB750'S] < [hidden email]> wrote:
Comstars should be marked whether they are tubeless or not.
A free people ought not only be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them,
which would include their own government.~George Washington
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Administrator
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I have never seen a comstar rim with a tube installed. If it is holding air, don't worry about it. However it should have been able to bead with a tube in it. TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."
1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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My CB750L has tubes front and rear. When I first bought it and had the tyres fitted, I argued with the fitter when he said I needed tubes, as my CX500 had Comstars and they were Tubeless. That's when he pointed out the differences. I have had the tyres changed a number of times - with tubes and no problem fitting.
Maz
'76 CB500T
'75 GL1000 'Wing
'79 CB750L
'90 FJ1200
'93 GS500E
In a little place called Bexley, Kent, UK (Just south of London!)
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Administrator
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Any tire fitter worth his salt should be able to spot whether a rim requires a tube or not. And he should be able to show/tell you this to ease your mind.
Tubeless rims have grooves that lock the tire beads to position, whereas a tubeless rim needs the tube to hold the beads against the shoulders.
If your rim has a small hole that an off the shelf valve stem fits in, then it's likely a tubeless rim since inner tubes require a much larger hole for their stem to protrude through. Unless he was trying to install a large auto stem to fill up a large tube-type hole, which could explain having interference issues with the tire and the stem.
Look at these pics. You can see just how important it is for a tube type rim to have a tube in place.
 
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Administrator
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Are your wheels marked tubeless or not? My Comstars were marked as tubeless. If they aren't marked, I'd be tempted to look closely at the rim ( even from the outside you should be able to tell something) and decide for myself.
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Nowhere on the rim says anything about it being tubeless. Also the pictures posted above further make me think its not meant to be tubeless. That being said I've been riding tubeless . I've put about 200 miles on the new tire with no issue at all. I reallly hope my shit doesnt come off or something crazy.
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Administrator
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If it required a tube, it would not hold air, let alone go 200 miles.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."
1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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Administrator
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TOOLS1 wrote
If it required a tube, it would not hold air, let alone go 200 miles.
TOOLS
Comstars are solid metal, so it'd hold air regardless. The difference will be in the bead seat area. I know for a fact ( just like the others who have posted up here) that Comstars come in both flavors. Pretty silly that Honda ever made a tube-type mag !
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Locked
