Post summer inspection continuing on my 315RLTS. Below is a series of measurements (in mm) of each of the grooves in each tire. My conclusion about the wear pattern is underneath each picture. Note that "chng" is the change (difference) from the previous measurement.
The column labeled "1" is the groove on the outside of the tire, then each subsequent numbered column works inwards (so "4" is the innermost groove). An electronic tire tread depth gauge was used to take the measurements. I attempted to center the gauge's pin in the groove and to ensure there wasn't an anomaly at the measurement point that could throw off the reading.
CONCLUSION: Not knowing the wear when the tires were rotated (a mistake on my part) it appears there's an issue with the rear curb tire position. Tire 4 was in the Curb Rear position and if you look below at Tire 4's fourth groove's wear it is also more than the Tire 2 or 3 (the wear could have happened while in the Curb Rear spot, in other words before the tire was rotated).
I'll be rotating the tires before towing the trailer again and will have to measure the wear on the tire that goes in the Curb Rear position to see if it also excessively wears on the inside edge.
CONCLUSION: Based on the wear pattern, it appears to me the 80 psi (cold) I've been running is too low. The Sailun has a cold maximum of 110 psi, so going to increase the cold pressure norm to 90 psi.
CONCLUSION: Same as tire 2. Note ALL the tires will have a new cold setting of 90 psi.
CONCLUSION This one is odd -- not sure why the third groove shows relatively little wear versus the rest of the grooves. Could be a measurement mistake. Since this position is the heaviest (I know this from a previous WeighSafe tire-by-tire measurement) it is not surprising this tire wore faster than the others. Oddly, the 80 psi appeared to be correct for this tire. I'm still going to use the same pressure for each tire (90 psi)--at least that's the conclusion as of this first post.
SUMMARY
I invite counter opinions or other information I've not considered based on what you see (I'm not a tire expert).
A PDF with the same information is attached below should that be easier to review.
Howard
Tire History 315RLTS.pdf
The column labeled "1" is the groove on the outside of the tire, then each subsequent numbered column works inwards (so "4" is the innermost groove). An electronic tire tread depth gauge was used to take the measurements. I attempted to center the gauge's pin in the groove and to ensure there wasn't an anomaly at the measurement point that could throw off the reading.
CONCLUSION: Not knowing the wear when the tires were rotated (a mistake on my part) it appears there's an issue with the rear curb tire position. Tire 4 was in the Curb Rear position and if you look below at Tire 4's fourth groove's wear it is also more than the Tire 2 or 3 (the wear could have happened while in the Curb Rear spot, in other words before the tire was rotated).
I'll be rotating the tires before towing the trailer again and will have to measure the wear on the tire that goes in the Curb Rear position to see if it also excessively wears on the inside edge.
CONCLUSION: Based on the wear pattern, it appears to me the 80 psi (cold) I've been running is too low. The Sailun has a cold maximum of 110 psi, so going to increase the cold pressure norm to 90 psi.
CONCLUSION: Same as tire 2. Note ALL the tires will have a new cold setting of 90 psi.
CONCLUSION This one is odd -- not sure why the third groove shows relatively little wear versus the rest of the grooves. Could be a measurement mistake. Since this position is the heaviest (I know this from a previous WeighSafe tire-by-tire measurement) it is not surprising this tire wore faster than the others. Oddly, the 80 psi appeared to be correct for this tire. I'm still going to use the same pressure for each tire (90 psi)--at least that's the conclusion as of this first post.
SUMMARY
I invite counter opinions or other information I've not considered based on what you see (I'm not a tire expert).
A PDF with the same information is attached below should that be easier to review.
Howard
Tire History 315RLTS.pdf
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