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Thread: Coker Tires

  1. #11
    Join Date
    Feb 2013


    Last spring in preparation for a trip to Sturgis my riding partner ordered a new Coker 1" whitewall for his 65FLH. I ended up lacing a new rim & spokes to his hub (it was one of the Dixie $20 rims BMI is selling) I mounted the new tire, with the dot at the valve stem and put it on the stand to static balance. 5-1/2 oz and the tire still had a bad heavy spot. I rotated the tire 180-deg on the rim, and the same spot was still heavy. I removed the tire and rechecked the wheel ass'y. Where-ever I released the rim it stayed still. Tom called Coker and ended up ordering a 2nd tire. (first came from J&P and was about $40 higher even with gold club) the 2nd tire balanced with 2) 1/2 oz weights a spoke apart about 120-degrees from the stem. Coker took back & credited tire #1, but I think they thought we were full of crap. Later we saw another bike we ride with that had a shop installed Coker tire with 4 large weights on consecutive spokes. I myself ride the Shinko E270, I never liked the earlier Coker tires in turns, I did not trust the edge of the tread to hold the road. They are on my 'mock-up' wheels now.
    But also the mold release, Avon MK-II are very slick first mounted. I suggest guys find a sandy or gravel area the first 1000 ft.

  2. #12
    Join Date
    Mar 2014


    Quote Originally Posted by T. Cotten View Post
    I wish Coker was here to respond, Folks!

    But long after I stopped vending tires,
    a good customer bought Cokers from a local Dealership.

    The tread was funny, with the center groove filled, although maybe not a bad idea?

    The ones I have on my '65 have that filled in center groove. I figured they did that on purpose to help with the squirming on grooved pavement? Still squirms on grooved pavement but fine otherwise.

  3. #13


    Howdy chaps,

    These have been discussed extensively on Caimag over the years. Couple of observations. Coker can rise to the occasion when making licensed products such as the Firestone zig zags as it is likely Firestone and others specify more rigorous requirements if their name is to be emblazoned on the sides. Have been happy with those on my Knuckle for 5 years now but absolutely not with what it was purchased with. Coker Commanders of two iterations, older open center siping on the front wheel a later closed center as mentioned by Cotten on the rear. My conclusion, Coker house brand/generics are held to no standard beyond that to survive the most basic litigation resulting from the purchaser’s demise.

    No amount of pressure variation front to rear could make for a semblance of sure footedness on this machine admittedly challenged for that in cross winds with an accessory front wheel disc fitted. In a fit of desperation before the 2015 Cherokee road run I swapped wheels on each end and achieved a slight sense of stability with the closed center tread now on the front. Ironically with the open tread now on the rear it went from 75% tread depth to cords and partial carcass delamination in only 3 days on those abrasive roads.

    Having a perfect pair of original NOS Goodyear’s on which this tire design was based my conclusion was that the far more compliant rubber of modern hysteresis was structurally incapable of matching the more rigid rubber of yesteryear in this configuration and unless one shaved those tires to half tread depth - as is common when using DOT street tires for road race events like time attacks - before initially mounting them, the rider was going to be subjected to this handling vagueness until they wore down considerably. Sense of mortality and lack of patience ruled out that experiment.

  4. #14
    Join Date
    Jun 2001
    Central Illinois, USA


    Since balancing was brought up, Folks,...

    Anybody notice that star hubs won't reproduce the same balance twice on many modern balancing machines?

    Even with a centering sleeve through the thrust collar.

    You might as well just spin the wheel on its axle.

    PS: Is PJ1 "Balance Plus" extinct?
    Last edited by T. Cotten; 05-09-2019 at 01:36 PM.
    AMCA #776
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