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Old 01-19-2017, 08:33 PM   #1
rbullockv8
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Default Coker tire question

I can call Coker tomorrow before I take my tires and rims to the tire shop, but thought someone might know the answer.

I received my new tires (Coker 600x16s, ordered through Summit Racing). They're blackwalls, but have a raised area on one side like where the whitewall would be. The other side of the tire is flat in this area. The flat side is also where the colored dot is that I think is supposed to line up with the stem hole in the rim.

Anyone know which side of these Coker blackwalls is supposed to face outward?
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Old 01-19-2017, 08:52 PM   #2
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Default Re: Coker tire question

Those tires are not directional specific so you can place them as you prefer.

I am fairly certain the dot is the heavy degree of the tire. If I am recalling correctly, you'll want that set at 180° from the stem.
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Old 01-19-2017, 10:15 PM   #3
Mr. Will
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Default Re: Coker tire question

I just mounted a set of Coker tires yesterday for my 36. I had the flat side mounted out and dot 180* from stem
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Old 01-19-2017, 10:28 PM   #4
Tony Martino
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Default Re: Coker tire question

I don't know a whole lot about anything but...
I believe that the thick rib on a Firestone Deluxe Champion
is mounted on the outside of the wheel. The raised rib
is there to rub against the curb so as to protect the
white wall from scraping. Black walls and white walls
were made/are made in the same mould so the rib is still there
even on black walls. I suppose Cokers are the same.
Just my $.02.
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Old 01-20-2017, 08:29 AM   #5
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Default Re: Coker tire question

My understanding is the Dot is the lightest point of the tire, and should be lined up with the heaviest point on the rim (usually where the the stem is).
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Old 01-20-2017, 08:45 AM   #6
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Dot is normally fitted by the valve stem.
Martin.
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Old 01-20-2017, 09:28 AM   #7
richard crow
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Default Re: Coker tire question

why don,t you call coker
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Old 01-20-2017, 12:05 PM   #8
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Default Re: Coker tire question

Hi all; From my aircraft mechanic days, The raised rib on the sidewall was a spray deflector. mounted to the outside it helped deflect mater/slush away from your car body/ aircraft eng and propeller. I mounted my Firestones with the rib to the outside. The front tire on a a light aircraft would have ribs on both sides. Make sense to you all? Newc
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Old 01-20-2017, 12:31 PM   #9
Tony Martino
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Default Re: Coker tire question

Hey Newc, thanks, cool!
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Old 01-20-2017, 12:57 PM   #10
rbullockv8
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Default Re: Coker tire question

Quote:
Originally Posted by richard crow View Post
why don,t you call coker
I called this morning. They said it's my preference. A little hard to be confident without comparing in real life or photos. But decisions like this?--that's why they pay me the big bucks. 😄
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Old 01-20-2017, 02:57 PM   #11
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Default Re: Coker tire question

Quote:
Originally Posted by rbullockv8 View Post
I called this morning. They said it's my preference. ��
That sounds like the official code for......"I ain't got a clue!" DD
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Old 01-20-2017, 03:36 PM   #12
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Default Re: Coker tire question

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Originally Posted by V8COOPMAN View Post
That sounds like the official code for......"I ain't got a clue!" DD
I think it sounds like why worry about it.
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Old 01-20-2017, 11:19 PM   #13
rbullockv8
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Default Re: Coker tire question

I decided to go with the black-wall bump outward. Here are pics of inside and outside. Don't think it makes much difference as long as they are the same.
Attached Images
File Type: jpg IMG_5088.jpg (111.9 KB, 101 views)
File Type: jpg IMG_5089.jpg (98.1 KB, 94 views)
File Type: jpg IMG_5090.jpg (107.1 KB, 92 views)
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Old 01-20-2017, 11:26 PM   #14
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Default Re: Coker tire question

IMHO; I think that it looks better & more correct with the "bump" outward.
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Old 01-22-2017, 01:21 AM   #15
rbullockv8
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Default Re: Coker tire question

Swapped out the old wheels & tires for the new ones today while it was pouring outside. Believe me, the California drought is over. We're over our yearly total, and the year runs from Oct 1st to Sept 30th. Got a long way to go yet.

Wheels and tires turned out great, and it only took me 30 or so minutes to find where I'd stashed the hubcaps 4 years ago. :-)

Now to work on a dozen other little details and one big one: the top.
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Old 01-22-2017, 09:37 AM   #16
ct1932ford
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Default Re: Coker tire question

So what did they (Coker) say about blue dot? I never considered the blue dot when mounting mine and they seem fine.
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Old 01-22-2017, 09:54 AM   #17
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Default Re: Coker tire question

Quote:
Originally Posted by ct1932ford View Post
So what did they (Coker) about blue dot? I never considered the blue dot when mounting mine and they seem fine.
I too would like to know.
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Old 01-22-2017, 10:44 AM   #18
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Default Re: Coker tire question

Quote:
Originally Posted by scooder View Post
Dot is normally fitted by the valve stem.
Martin.
The painted dot usually denotes the lightest part of the tire and should be alligned with the valve stem. This will minimize the amount of weights needed to balance a tire.
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Old 01-22-2017, 11:05 AM   #19
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Default Re: Coker tire question

It has always been my understanding that the dot went in line with the valve.
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Old 01-23-2017, 12:52 PM   #20
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Default Re: Coker tire question

is the valve heavier than the metal it displaced?
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Old 01-23-2017, 01:33 PM   #21
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Default Re: Coker tire question

On a tube type application, the rubber stem is somewhat reinforced in rubber around the metal parts that it's vulcanized to. It is generally heavier than the small slug that is removed from the wheel to allow for it. We are only talking grams here when referring to differences so it's not by much. Tire carcasses and treads are a lot more uniform on modern tires but the reproductions are made in pretty much the same way they were back then with some exceptions. The plys generally always have an overlap somewhere so there can be a fair amount of gram weight difference at the overlap points depending on the carcass design. Some tires are marked for runnout too to but I don't think any of the reproductions are and the old rims aren't marked for that either.

The dot is for reference alignment to the stem location on all the tires I've worked with including aircraft tires. The dots are usually yellow but now days, it's up to the manufacturer.
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Old 01-23-2017, 02:36 PM   #22
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Default Re: Coker tire question

Quote:
Originally Posted by rotorwrench View Post
On a tube type application, the rubber stem is somewhat reinforced in rubber around the metal parts that it's vulcanized to. It is generally heavier than the small slug that is removed from the wheel to allow for it. We are only talking grams here when referring to differences so it's not by much. Tire carcasses and treads are a lot more uniform on modern tires but the reproductions are made in pretty much the same way they were back then with some exceptions. The plys generally always have an overlap somewhere so there can be a fair amount of gram weight difference at the overlap points depending on the carcass design. Some tires are marked for runnout too to but I don't think any of the reproductions are and the old rims aren't marked for that either.

The dot is for reference alignment to the stem location on all the tires I've worked with including aircraft tires. The dots are usually yellow but now days, it's up to the manufacturer.
Rotor, I'll take your word for the dot placement. thanks.
as a side note of sorts, I have found modern tubes to be horrible enough that to balance a wheel / tube / tire assembly has been nearly impossible at times.
While I realize this hardly seems possible, rest assured it is.
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Old 01-23-2017, 03:15 PM   #23
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Default Re: Coker tire question

I know what you mean about tubes. There is some real crap being manufactured with respect to tire tubes. Also, some tires have structural problems from the get go and can never be balanced without shaving them but who is going to do that in this day and age. Especially with a new tire. They used to do that crap with recaps but the only recaps now days are generally for trucks due to the expense of those. They are in a whole different league.

All of this stuff is mostly of foreign manufacture now days and quality control appears to be non existent for some.

Just to add: A lot of tires that are dot marked are very close all the way around so the the mark may be moot on some of them. As long as it gets to a fairly good balance. Most of the rotors on helicopters are balanced to a velocity of 0.2 inches per second which is saying that it's not perfect but it's close enough. I've had some that I could just barely make 0.2 IPS due to shaft run out and other factors. Tires aren't much different but you can only adjust balance. There is no easy way to adjust for wobble or tip run out.

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Old 01-23-2017, 04:03 PM   #24
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Default Re: Coker tire question

With my Coker Radials, I mounted them with the dot next to the valve stem, used balancing beads inside the tubes. The style tire I have does not have the ridge.
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