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Archive for November 8th, 2004
Question 19
Posted by Phil on November 8, 2004
I am told that it is getting harder to find Low Profile 24.5 casings. What can you tell me about the future of this tire size casings?? Is the industry moving away from this tire size??
There has been a slight downward trend in the popularity of Low Profile 24.5 casings. Data collected by Modern Tire Dealer on the most popular radial medium truck tire sizes shows that tire shipments of 295/75R22.5 have declined from 11.7% of all shipments in 2000 to 10.5% of all shipments in 2003. While the statistics show a decline in use Low Profile 24.5 casings, this size is holding steady and is still in the top 5 casing size purchases for radial medium truck tires. You don’t need to worry about availability anytime soon.
Question 18
Posted by Roland on November 8, 2004
I would like to buy new tires for our Concrete trucks but the damage from off road debris is high. The problem is finding good 12R22.5 casings for capping. My question is would the 11R22.5 be a better choice for reteading because the casings ages are better and have not been not subjected to the abuse our on road off road 12R22.5 casings we buy for reteading. Florida concrete trucks usally are spec with 12R22.5 but the 11R22.5 16 ply tires should have the weight capacity to be legal.
Your line of thinking is reasonable. Typically an 11R22.5 casing takes less abuse for the types of service it encounters than its bigger brother. However, when buying caps and casings it is impossible to determine the amount of abuse the casing took in their previous life so the assumption will not always hold true. Most retreaders do a rigorous evaluation of all casings prior to retreading. If your 12R22.5 are recapped by a reliable retreader then you should not have to worry about casing integrity.
Switching to an 11R22.5 will force you to make a few trade-offs that are most likely not worth it. First you will have to manage two different tire sizes in your fleet. Second switching to the 11R22.5 you will loose significant load carrying capacity dropping from 7390 lbs to 6610 lbs at 120 psi inflation. Exceeding these limits is not only unsafe but would be even more damaging to your casings than the typical abuse encountered in your mix serviced concrete application.