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Archive for July, 2008
Major tire tread on 225/70R19.5 G647 RSS
Posted by Michael from Santa Rosa, CA, US on July 28, 2008
I’m looking for someone to tell me what are the major tire grooves on this tire. There is two small skinny lines on the outside of this tire that go around this tire and needed to know if these are concidered a major tire groove or not.
A major groove is described as a groove that contains a tread wear indicator. A tread wear indicator is a "bump" at the bottom of the a groove that helps to visually tell you when the tire is nearing the end of its treadlife. The two "skinny" grooves you describe are not major grooves.
11R22.5 or 12R22.5
Posted by Roland from Jacksonville, FL, US on July 28, 2008
Would it be wise to use a 11R22.5 tire in place of a 12R22.5 for vocational vehicles such as a Concrete Mixer trucks in Florida? I have some concerns about the availablity of 16 ply 11R22.5 cap and casings. The other concern is the load capacity is near the max on a 11R22.5 for three axle trucks.
If the truck came with 12R22.5 tires when new, you are concerned about availability of the 11R22.5 LR-H tire and the loads you are carrying would nearly max out the alternative tire, I would have to ask why you would want to switch. ?? I would stick with the 12R22.5 size.
Effect of Underinflation on Traction
Posted by Larry from Waterford, VT, US on July 17, 2008
Michelin has a commercial playing in Canada (passenger tires) &
they state that an “underinflated” tire will cause a loss of traction turning a good braking vehicle into an under performer”…
Now my question…and I am thinking more about truck tires. If you want higher traction…like in sand…you lower the pressure which gives you much better traction.
But Michelin is claiming that an underinflated tire will cause LOSS of traction…am I missing something?????
I have not seen this commercial but I suspect the statement is more like " underinflation CAN cause a loss in traction". Testing on dry pavement our test track, we find that, depending on the amount of underinflation and the speed of the vehicle, braking traction can be better or worse than the same tire set at the recommended pressure. Technically, this is caused by a reduction in cornering stiffness and lateral stiffness and also changes footprint length and pressure distribution across the footprint.
Wide Base or Fuel Max
Posted by Kristi from Louisville, KY, US on July 1, 2008
What are the pros and cons of wide base vs. Fuel Max duels?
Fuel Max
Pros - Improved fuel economy, same wheels/rims, no change in vehicle track width, replacement tires widely available, steer, drive and traier tires all the same size (easier tire/retread management) no change in vehicle trade-in value.
Cons - No reduction in tire/wheel weight
Wide Base Tires
Pros - Improved fuel economy, reduced tire/wheel weight
Cons - New wheels required, wider axle to retain current track width, limited tire replacement availability, steer tires different size than drives and trailer tires (what to do with worn steer tires?), trade-in value of vehicle may be compromised due to "non-standard" tire/wheel/axle sizes.