Technical > Jon's Wheel House
Hoosier replacement tires
masracingtd1167:
Glen How old is that tire and how many runs are on them ? If you are not sure then throw them away and put a new set of tires on it ! The side walls are what go bad in a drag tire !
Tires have been on the vehicle two years, but found they were manufactures in 2013. Number of runs I would be guessing at, 84. This was the response I got from Hoosier after talking with them and sending pictures.
Glenn,
The date code was actually D16N and it was produced in Feb of 2013. I cannot officially tell you that the tires are safe, simply because I can’t tell the future. That doesn’t mean there’s going to be an issue with them at all either. The cracking looks like it is just the thin sidewall rubber as that is the thinnest layer of rubber. The strength of the tire comes from the fabric not the thin layer of rubber on the outside sidewall. It might start leaking a bit, and it might not. You will have to make the ultimate decision to run them or not. Once again, the strength of the tire is in the fabric but the age might not allow the tire to be at its top performance level. I would just keep a close eye on them to make sure they don’t get worse.
I do believe that the 18221 is still our best replacement for your combination. It might even fit better as we talked with just a little less tread on the ground and help decrease the 60’ times.
I hope this info is helpful.
Thanks,
Faron Lubbers
Business Unit Manager
Drag Racing
Current plan is to run the same tires this year and buy new ones for the 7.0 next year. to that end I have just purchased a set of used rims for the 7.0 index. Double bead lock, 15 X 14 inches wide, 5 on 5
JrFuel Hayden:
Glenn, after looking at your photos, I think you can run them another season, they are just surface cracks. I have seen more/ deeper cracks, I think it's more about age. I put tire marking paint of the date on my tires when I put new tires on. My current tires are 2 years old, and the last set was more like 3 years old. My Goodyear contact says to replace tires when the 60's go away.
One point of interest is I've heard some of the ProStock guys would store their new tires in the attic [ hot] for 3-4 months to get them a bit harder and they get smaller.
Yes I have checked the softness of tires, and with age they do get harder, and when I've run the older/harder tires I increase the tire pressure on my 10" or 11" wheels to increase bite.
I hope this helps Glenn.
Jon
Van:
Every time I read these threads on tire & wheel combos I can't begain to understand all the reasons for small tires on wide rims. I have always ran a 2 inch smaller rim than tire size. I think that Jon & Bruce run narrower rims than tire size & it works. With a narrow rim the car takes less HP & time to get up on the tire.
My combo is way different than anything I've ever seen posted. I run a 33 X 14.5 Hoosier on a 12 inch rim 8 PSI. I run a 3.54 gear, We stage at idle & use only the foot brake. Our 60 Ft. times are 1.03 - 1.05 We use a 9 inch very tight converter. At the march meet 7.11 @ 189 Motor is detuned to keep it in the 7's I am almost ready to drop in the A fuel motor & might go to a 3.25 gear. I think I will need a 10 inch converter before it's right.
JrFuel Hayden:
Yes Van, we do run a different a different combo than you. JrFuel rules are limited to 12" wide tires and 12" rims, and iron heads and blocks on pure alky, no blowers, 3.5 lbs per ci, and powerglides.
Where as in 7.0 Pro you can run anything, but no electronics, just don't run in the 6's.
Van, how big is your motor, and I assume it runs lower RPM than JF, and if I remember right you are running a 400 turbo with one or two gears out. Your combo runs more torque is my guess, because of your 3.54 rear gear and 14.5 wide tire, our JF motors are 10,000 rpm low torque combos, running 4.88 or 5.37 rear gears. It goes to show you how many different ways you can get to run low 7's, 189 mph.
Cheers, Jon
Navigation
[0] Message Index
[*] Previous page
Go to full version