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Search TiresQ/A ArchivesAugust 2008
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Tim Miller Tim Miller has been with Goodyear for over 30 years. He spent 8 years as a tire design engineer before taking positions as a technical representative to original equipment customers Freightliner...more»»
Steer Tire Break in We have several tractor/ trailer combinations that routinely haul over 100,000 lbs. It has been suggested that we “Break in” our steer tires on our drive axles for a short period of time. Thinking being that it will create a wear pattern that will last for the better part of the tires life. Is this a viable suggestion? Steer tires are most vulnerable to irregular wear early in their working life when there is the highest tread depth. Putting steer tires on a drive position would just wear them off more quickly (and potentially more evenly) through these early miles. I suppose that could be an advantage but, if the truck is properly aligned and maintained, it should not be necessary.
Mismatched Drive Axle Tires What safety factors are involved when you have a mismatched pair of tread pattern on the rear axle of a rear axle drive? Both tires are the same size 225/75R15. The biggest problems could come from how much mismatched they are and the diameter difference. If one tire is an agressive drive tire and the other a rib tire, the traction differences on wet or snow covered roads might be an issue. If there is a big difference in diameter, your differential might need to work overtime to compensate for the difference in rolling circumference.
Replacement of G159 on 35′ class A motorhome` I am replacing the G159 245/R70R19.5 tires on my motorhome and the local dealer claims that the G149 tires are a good replacement. I ask him about the G670 RV, but he was not aware of it. We occasionally take cross-country trips, and I just would like to get a second opinion. We make the G670 RV in the size you need and it would be an excellent tire for your motorhome. You can get some more infomation here http://www.goodyear.com/truck/rv.html
Mixing G and H Load Rated Truck Tires on Same Axle I seem to remember that the mixing of different ply rated medium radial truck tires was not recommended in years past. Is this still the case? If so, besides not knowing what the inside dual carrying capacity is, what other tread wear and or safety concerns are effected? I don't think that mixing G and H load range tires would cause any significant problems. If the diameters of the tires are matched within a 1/4 inch and the tread patterns are the same or at least very similar, tire performance and wear should be fine. Structurally, the tires are similar with the higher load range tire capable of running with a highter inflation pressure that allows it to carry a higher load. When inflated to the same inflation pressure, two tires with the same or similar tread patterns should run fine.
G622 in Steer Position I have a Ford F450 4X4 on which I just recently put the G622 - 225/75R19.5 tire on both front and rear. The local dealer indicates he sells a lot of these for all positions, fire department 4X4 and oil field trucks, etc. The steering response with these tires seems to be mushy as compared to the previous tire, General LMT460’s. The info Goodyear sent me indicates these are Drive position tires. In terms of steering response would I be better served if I put G149’s on the front? For my winter time use I like the agressive tread (don’t like the noise) of the G622 and don’t really want to change unless the steering continues to be an issue for me. Also, I would like to ask what is the difference between steer position and drive position tire. Is it, from a safety stand point, acceptable to use a drive position tire in the steer position as I have. We do sell the G622 RSD as a drive tire. Technically, for a 4 X 4 truck, all the wheel positions are driven so, that should be fine. Steer tires are generally have a shallower tread depth and rib type tread designs. It is not surprising that a "lug" type tire might feel a little mushy, especially when new (full tread depth). Internally, steer and drive tires of the same size are very similar so, there is no real reason not to use drive tires on steer axles when the steer axle is driven. |
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