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Iron Butt
Posts: 802
| I spoke with Cobra and they still subscribe to the concept that the tire pressure shouldn't increase more than 10% from cold. I've been playing around with different pressures having started out with their recommended 36/42. At those settings it would go to 40/51+ after a freeway run and that's solo, no trunk and 70F air temp. I just tried 38/46 cold and it went to 41/51 after a 15 mile ride including a short freeway stint. Technically that's within the 10% but I'm curious what its going to do when its hot out and I have a passenger and luggage. The tech said it was OK to go as far as 50 psi cold so I still have some room yet. I wonder if there is any chance this tire isn't stiff enough for the Vision back end. Probably not but with pressures like this it gets me wondering. Does anybody else with Cobras know what your hot pressures went to?
Marc |
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Visionary
Posts: 4278
| I run 40/40 and get 15 thousand out of my tires. I check once a month and in hot weather I check twice a month.
Once a month I will loose 2 to 3 pounds and in the real hot weather 4 to 6 pounds.
Sorry I don't have a Cobra I just use a tire gauge and not one of those lam ass pencil sticks |
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Visionary
Posts: 4278
| Say on that Cobra how do you know if its correct |
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Iron Butt
Posts: 802
| Hi John,
Do you know what the rear pressure goes up to when its hot?
marc |
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Iron Butt
Posts: 802
| johnnyvision - 2013-04-05 3:50 PM
Say on that Cobra how do you know if its correctIf what's correct?
Marc |
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Iron Butt
Posts: 802
| After a ton of emails back and forth and trying different pressures and loads, Avon is now suggesting cold pressures of 39/47 solo and 41/50 two-up for the Cobras on a Vision.
Marc |
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Iron Butt
Posts: 612
| marcparnes - 2013-04-22 9:52 AM
After a ton of emails back and forth and trying different pressures and loads, Avon is now suggesting cold pressures of 39/47 solo and 41/50 two-up for the Cobras on a Vision.
Marc
YIKES!
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Iron Butt
Posts: 802
| Turk - 2013-04-22 8:04 AM
YIKES!
Yea, that's what I said. Actually it rides quite nicely at those pressures. I thought it would be harsh but not at all. I tried it at various different pressures and the differential to hot pressure was too high in their opinion. I'd be really curious to hear what an E3 rear does between cold and hot pressure just as a comparison. I need to get the most miles I can out of the rear on our cross country trip this summer. I want to try and make it with only one new rear in route. The front I have on there now has 7500 miles on it with lots of meat left so it should be fine. The rear is the issue.
These tires handle so well wet and dry and are so quiet that I'm determined to make them work.
Marc
Edited by marcparnes 2013-04-22 10:15 AM
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Tourer
Posts: 482
Beer Collins, Colorado (there is no fort) | Link to Avon recommended pressures- they only list Bias ply Venoms & Cobras-nothing for radials
http://www.avonmoto.com/tech/tire-pressure-guidelines
Edited by ByteN2it 2013-04-22 7:37 PM
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Iron Butt
Posts: 802
| The proper link for our bikes is here There is a tire fitment box to the right.
Of course it doesn't agree with what they finally recommended.
Marc �
Edited by marcparnes 2013-04-22 7:53 PM
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Visionary
Posts: 4278
| put 40psi in front and rear.
Now the first of every month check them and not with that junk gauge the vic gave you in tool kit.
When it get in the high 90's and above check every two weeks.
If you do this you will get max life out of tires. 15 thousand I'm thinking.
($(KGrHqV,!o8E63YcElkoBPDiTpNhCg~~60_1.jpg)
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Iron Butt
Posts: 802
| johnnyvision - 2013-04-23 4:50 PM
put 40psi in front and rear.
Now the first of every month check them and not with that junk gauge the vic gave you in tool kit.
When it get in the high 90's and above check every two weeks.
If you do this you will get max life out of tires. 15 thousand I'm thinking.John, I don't know what experience you have with Cobra tires but the pressures I quoted above are directly from the manufacturer. Not even Avon themselves thinks anyone can get 15K out of a rear Cobra. They are estimating more like 8-10K. Are you thinking about E3s or the car tire you have on the back instead? I'm assuming Avon probably knows their tires best. Don't you think?
Marc |
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Tourer
Posts: 482
Beer Collins, Colorado (there is no fort) | I got my Cobra rear tire shortly after they were available and where the max load & max pressure numbers should be is a blank. I don't know what the newer ones have on them-I've been running 40/42 on front/back and it's wearing & handling well. Could you please post your Email from Avon recommending the higher pressure ? I haven't seen a radial MC tire with a max cold pressure higher than 42. Thanks
Edited by ByteN2it 2013-04-23 8:34 PM
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Iron Butt
Posts: 802
| ByteN2it - 2013-04-23 6:30 PM
I got my Cobra rear tire shortly after they were available and where the max load & max pressure numbers should be is a blank. I don't know what the newer ones have on them-I've been running 40/42 on front/back and it's wearing & handling well. Could you please post your Email from Avon recommending the higher pressure ? I haven't seen a radial MC tire with a max cold pressure higher than 42. Thanks
What? You don't believe me ? :-) Here is the entire email stream. Start from the bottom. Last email is on top.
Hi Marc, I would recommend 39psi front and 47psi rear for solo. 41psi front and 50psi rear for 2up.
Kevin Corbett
Mickey Thompson/Dick Cepek/Avon Motorcycle
Technical Service Representative
1-800-222-9092
Ext.3169
From: MarcParnes
Sent: Friday, April 19, 2013 7:53 PM
To: Corbett, Kevin A.
Subject: Re: Avon Motorcycle Tyres North America Contact: Pressures
Hi Kevin,
Ok, I'll forget about the 10%. Can you please give me the proper pressures for this bike running solo and double and I'll use them. I'm mostly interested in the highest mileage possible particularly from the rear. I'm going to do a cross country trip this summer and trying to find shops that can pull the rear wheel on a Vision is difficult so my goal is to do as few changes as possible. Last year we did the same trip and I made it all the way (8500 miles) on one E3 but I'm not planning on the Cobra to go that far so I'm going to organize a new rear along the way. I think the front can do the entire trip.
Thanks for the help!
Marc
In a message dated 4/19/2013 12:06:31 P.M. Pacific Daylight Time, kcorbett@mickeythompsontires.com writes:
Hi Marc, I spoke with some of our engineers and they said 50psi is the maximum recommended pressure. That being said it seems that on the really heavy bikes the 10% rule does not seem to work and they would not worry about the increase in pressure that you have seen.
Kevin Corbett
Mickey Thompson/Dick Cepek/Avon Motorcycle
Technical Service Representative
1-800-222-9092
Ext.3169
From: MarcParnes
Sent: Thursday, April 18, 2013 1:25 PM
To: Corbett, Kevin A.
Subject: Re: Avon Motorcycle Tyres North America Contact: Pressures
Hi Kevin,
Do you need a copy of yesterday's email?
Thanks,
Marc
In a message dated 4/18/2013 5:00:08 A.M. Pacific Daylight Time, kcorbett@mickeythompsontires.com writes:
Hi Marc, I have sent this email on to get another opinion. I will get back to you soon. Also I could not respond to the emails you sent yesterday this is why I am contacting you from this previous email.
Kevin Corbett
Mickey Thompson/Dick Cepek/Avon Motorcycle
Technical Service Representative
1-800-222-9092
Ext.3169
From: MarcParnes
Sent: Monday, April 08, 2013 11:07 AM
To: Corbett, Kevin A.
Subject: Re: Avon Motorcycle Tyres North America Contact: Pressures
Hi Kevin,
I took it for a 300 mile ride on Saturday still solo including a long freeway stretch on the way back. I set them to 38/46 when I left and checked them again as soon as I got back and they went to 43/53 this time. The ambient temperature was about the same when I left as when I came back. I'll try them at 39/48 and see what happens. The next long ride will probably be next Saturday but I may have to make a shorter run to the Vic dealer mid week. I'll let you know. Thanks for following up on this with me.
Marc
In a message dated 4/8/2013 7:55:51 A.M. Pacific Daylight Time, kcorbett@mickeythompsontires.com writes:
Hi Marc, the front pressures seems to be good now. The rear is still a little on the low side, I would recommend jumping up to 47psi cold for solo and then 50psi cold when you are riding 2up with luggage. It still seems very strange that the hot pressure is always 51psi on the rear.
Kevin Corbett
Mickey Thompson/Dick Cepek/Avon Motorcycle
Technical Service Representative
1-800-222-9092
Ext.3169
-----Original Message-----
From: Marc Parnes
Sent: Friday, April 05, 2013 5:23 PM
To: Avon Information
Subject: Avon Motorcycle Tyres North America Contact: Pressures
To: Webmaster
From:
Marc Parnes
Daytime Phone Number:
Bike Year:
2013
Bike Manufacturer:
Victory Vision
Message:
Hi,
I just spoke with you an hour ago regarding the tire pressures on my
Vision. I raised the cold pressure to 38/46 and took it for a short
run of about 20 miles including a short stint on the freeway. I
checked them when I got back with the same gauge and they now are
41/51. The ambient temp is 71F and I'm running solo without the trunk
installed. As I told you on the phone, when I run the cold pressure
lower like at 42 it still goes to 50-51. I'm wondering what will
happen with a passenger and luggage. I'm taking a cross country trip
this summer with a full load which is why I'm concerned. Any other
recommendations to try? Is it possible that the rear just isn't stiff
enough for this application? Just wondering.
Thanks,
Marc
This is the one that is missing:
Hi Kevin,
I just got home and rechecked the tires using the same gauge. I'm about 7 miles off of the freeway so they might have cooled a bit. Ambient temperature is about 72. It was 68 when I left. We were two-up with no trunk. The front has gone from 39 to 42 which is 8% and the rear went from 50 to 58 which is 16%. There was one point along the route that I saw 60 in the rear but only for a short period. Is there anything else I can do or is that it? Should I leave it at 39/50 and see how it does solo or lower it down to 58 in the rear? Do you suggest I stay with Cobras or go back to Dunlop E3's?
Thanks,
Marc
Edited by marcparnes 2013-04-23 8:45 PM
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Tourer
Posts: 482
Beer Collins, Colorado (there is no fort) | I believed you I just didn't want to go through the process myself with a tech-thanks again. I did find two other printing where Avon spokesmen mention the tyres are good up to 50PSI. Thanks again |
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Iron Butt
Posts: 802
| ByteN2it - 2013-04-23 7:13 PM
I believed you I just didn't want to go through the process myself with a tech-thanks again. I was just joking :-)
Marc |
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Tourer
Posts: 411
Dallas, Texas | Ok...I have to ask. Isn't proper tire pressure a function of tire size/dimension and vehicle weight, load, etc., and not the tire manufacturer? Therefore, why are the psi's listed in the service manual incorrect if you are using the recommended tire sizes? |
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Iron Butt
Posts: 802
| In my experience aftermarket tire makers often have different pressure recommendations than OE. I'm running Michelin PR3 on my Triumph and they also have different pressures than my owners manual. I think the tire construction and materials have an effect on the pressures in addition to the load and use. I've noticed that OE usually quotes lower pressures than the tire makers. Maybe OE is more interested in the ride and less in longevity as compared to the tire maker. Just a guess.
Marc |
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Cobra Tire Pressures
