Avon Cobra Chrome AV92 Clearance Issue


Information and questions on GL1500 Goldwings (1988-2000)
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Solopilot
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Motorcycle: 1997 GL1500 Aspencade

Avon Cobra Chrome AV92 Clearance Issue

Post by Solopilot »



Hi everyone, first post here, must say awesome source of information here, and a great community.

I have question for the people out there running the Avon Cobra Chrome AV92 tires. What is the rear tire clearance like on the right hand swingarm of the Goldwing 1500? (Could you possibly post pics?)

Reason I ask is, I purchased as set of Cobra Chrome tires for my Goldwing in factory size (R 160/80-16, F 130/70-18) the front is absolutely fine, the rear on the other hand is rubbing the rear swing arm on the right (driveshaft side) pretty significantly, the gap on the other side between swingarm and tire is approx. 3/4 of an inch. Also wondering if it naturally a little close or is there a good gap on both sides?

I will add that while replacing the tire I also replaced the rear wheel bearings for good measure while I was in there. I've done many wheel bearings in my time and are certain they are full seated and square.

I am leaning towards a defective tire but want see what the community opinion was, I will include a link to some pictures so you can see what I am saying. If you look at the two pictures from the rear of the bike, you will see that it appears the side of the tire bulges out on the right side more the on the left, kind of roundish on the right side, more of a sharp downward angle on the left. The other picture is from underneath where the tire is rubbing the swingarm.

Thanks in advance for you time.

https://imgur.com/a/RTcIdIb


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Rambozo
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Re: Avon Cobra Chrome AV92 Clearance Issue

Post by Rambozo »

Measure the distance from the rim to the swingarm on each side. That will tell you if the rim isn't centered or if it's just the tire that isn't centered. Also you can look at the guide line on the tire where it meets the rim to see that it is mounted properly.
Solopilot
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Re: Avon Cobra Chrome AV92 Clearance Issue

Post by Solopilot »

I checked the distance between the swing arms, and honestly I did not trust the numbers as the rear swing arm is asymmetrical. So I decided to compare it to my buddies '95 1500 as far as we can see, they are nearly identical, maybe 2 or 3mm difference between the two. We next decided to pull his rear wheel, remove the brake rotor off both wheels, and lay both rear wheels side by side rotor mounting side down, then we took measurements from the concrete floor to various parts of the wheel to check offset, hub spacing, overall hub width, rim offset, rim width etc. Every measurement came back identical. I am pretty confident we can rule out the wheel or how it sits in the swingarm as the issue.

While we were in the process of doing this we did notice the tire in question isn't really offset as much to one side as it would appear in the pictures, but it is way wider then the Dunlop E3 my buddy is rockin' in the neighborhood of 1.5 or 40mm. I have read else where that Avon tires do run wide, but this tire seems to measure closer to a 195 width than a 160. Any thoughts?

Thanks -Solopilot
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Rambozo
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Re: Avon Cobra Chrome AV92 Clearance Issue

Post by Rambozo »

Plenty of people run that tire. So maybe you got a bad one? Hard to understand how as the size is machined right into the mold, so a wrong mold or mislabel would be easy to catch. Out of curiosity what pressure are you running?
When compared to you buddies, how was the tire width compared to the rim on each side. Symmetrical on both tires?
Solopilot
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Re: Avon Cobra Chrome AV92 Clearance Issue

Post by Solopilot »

Ya, I do not understand how the molded size on the side wall could be wrong, but it seems to be. For pressure I was running 42psi. Compared to my buddies rear tire my tire did appear to be more symmetrical than it looked in the pics, a little hard to tell as the side wall is shaven down a little on my tire.

Thanks -Solopilot
Lundhag
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Re: Avon Cobra Chrome AV92 Clearance Issue

Post by Lundhag »

Hello , realise its been a while since your last post on this topic but wondered if you found out what the problem was. The reason I ask is that I have just purchased a 1500 with exactly the same issue.
Regards.
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Charlie1Horse
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Re: Avon Cobra Chrome AV92 Clearance Issue

Post by Charlie1Horse »

The manual says to drive in the left bearing first and then insert the distance collar and then the right bearing. I have never had one of these apart so I don't know what the inside of the hub looks like but is it possible that in driving the right bearing, you could have driven both of the bearings too far to the left side? If so, that would set the wheel/tire farther to the right and maybe cause this problem. If there is a distance collar to set the distance between bearings maybe there is no shoulder to stop the bearings from driving in too far. Just a thought.
Russell
Those who say it cannot be done should try not to interrupt those who are doing it.
Lundhag
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Re: Avon Cobra Chrome AV92 Clearance Issue

Post by Lundhag »

Thanks Russell, I purchased my bike recently, kind of sold as seen via a dealer here in th UK. There was a brief condition report that mentioned the rear tyre was rubbing but the dealer suggested it was the wrong size. I have since checked and it looks correct, 160/80 - 16 Avon Cobra Chrome. I will have to get the wheel off and check the bearing spacings as you suggest. First I have to sort out a seized center stand! Its a bit of a project.
Thanks again.
Wayne.
Solopilot
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Re: Avon Cobra Chrome AV92 Clearance Issue

Post by Solopilot »

Sorry Lundhag, just seen you posted a question to this. I never found a solution. The vendor I bought the tire from refunded me and I order a Dunlop E4. The only thing I say is The Dunlop fit great with a good amount of clearance. I can also add I still have the Cobra front, and I am not a fan. In dry conditions it is fine, but in wet, I find it loses traction very easily, the cooler it gets the worse it seems, even well above 7c. So, may I suggest getting away from the Avon Corbra's completely.
Lundhag
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Re: Avon Cobra Chrome AV92 Clearance Issue

Post by Lundhag »

Thanks for getting back solopilot. I havent been able to get the rear wheel off yet but i will take a look at the Dunlops as the tyres do need to be replaced front and rear. Its strange that most seem to fit the Avons with no issues. Whether its production variances on the Honda or the tyre I dont know. The swingarm on my bike does appear to have some surface corrosion and not sure if its expanded, again something I need to check.
Thanks again.
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Sadanorakman
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Re: Avon Cobra Chrome AV92 Clearance Issue

Post by Sadanorakman »

I have the cobra chromes on my 1500, and whilst the rear doesn't rub, it runs quite close to the swing arm.
I had to deflate it to drop the rear wheel out a couple of weeks ago when I had the back end apart to replace a split UJ gaiter, lube all the drive splines, and change the final drive oil.
Measure twice, cut once.
Lundhag
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Re: Avon Cobra Chrome AV92 Clearance Issue

Post by Lundhag »

Since my last post some time ago I did get the rear wheel off and measured the width of the Avon, I got it to 168mm, this doesn't include the couple of mm shaved off on the swing arm. By comparison I have purchased a new Kenda Kruz tyre which I have measured at 158mm, so potentially quite a difference.
Attachments

Rear Avon Tyre showing contact with swingarm
Rear Avon Tyre showing contact with swingarm


Rear Avon tyre showing contact with swingarm
Rear Avon tyre showing contact with swingarm



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