This is what treads looks like after 30000km with 38psi Front and 26psi rear
#1
07-06-2015, 07:15 PM
This is what treads looks like after 30000km with 38psi Front and 26psi rear
Prefect tread wear.
Rotation every ~7000K
Front -1.5 degree camber
Rear -1.0 degree camber
(Tire Wear Rating 220)
From the very start of owning this car, I've found that with rear tire pressure above 30psi, the shoulders of the threads would not make contact with the ground as it bulges in the middle, making the back end feel jumpy and harsh, while wearing the middle of the thread faster then the shoulders. And the Fit with a 65.4/34.6 F/R weight bias, this made sense.
(The rear wheels carries around 440 pounds per wheel, where as the front carries around 840 pounds each, almost double that of the rear.)
This pressure setting also eliminates the look of the front tires running flat while the rear tire wall does not even flex...
This was an experiment on whether tire pressure could be set proportional to the load it was carrying, and with such a heavy front weight bias on the Fit, the pressure I proposed sounded ridiculous, with cautions of catastrophic thread wear and other bad consequences from all discussions that more likely stems from the unconventional pressure difference, without real evidence on why this would not work.
This experiment was carried out by a DD Fit that does not carry any significant cargo or passenger 360/365 days.
YMMV.
Feel free to ask any questions or express any comment.
Rotation every ~7000K
Front -1.5 degree camber
Rear -1.0 degree camber
(Tire Wear Rating 220)
From the very start of owning this car, I've found that with rear tire pressure above 30psi, the shoulders of the threads would not make contact with the ground as it bulges in the middle, making the back end feel jumpy and harsh, while wearing the middle of the thread faster then the shoulders. And the Fit with a 65.4/34.6 F/R weight bias, this made sense.
(The rear wheels carries around 440 pounds per wheel, where as the front carries around 840 pounds each, almost double that of the rear.)
This pressure setting also eliminates the look of the front tires running flat while the rear tire wall does not even flex...
This was an experiment on whether tire pressure could be set proportional to the load it was carrying, and with such a heavy front weight bias on the Fit, the pressure I proposed sounded ridiculous, with cautions of catastrophic thread wear and other bad consequences from all discussions that more likely stems from the unconventional pressure difference, without real evidence on why this would not work.
This experiment was carried out by a DD Fit that does not carry any significant cargo or passenger 360/365 days.
YMMV.
Feel free to ask any questions or express any comment.
Sorry thought the thread topic was not model specific...
#4
07-07-2015, 09:23 AM
Update with new tire ground contact area
Front left tire, 38psi cold pressure:
Rear Right tire, 26psi cold pressure:
As you can clearly see, with pressure at 26psi and aggressive mountain road driving, the rear tire shoulders barely touched the road.
Front left tire, 38psi cold pressure:
Rear Right tire, 26psi cold pressure:
As you can clearly see, with pressure at 26psi and aggressive mountain road driving, the rear tire shoulders barely touched the road.
Last edited by eternal_fantasy; 07-07-2015 at 10:42 AM.
#5
07-22-2015, 07:19 AM
I've made this type of allowance in F-R pressures for years. Remember, inflation values on the doorjam sticker are for FULL RATED LOAD, not typical driver-only use.
If you were truly anal about inflation pressures,
you could always buy an inexpensive non contact thermometer to test temperatures across the tread after your drives. ~$20 USD in this country.
Infrared Thermometer - Non-contact, Digital Thermometer
A uniform HOT temperature across the tread would pinpoint the correct PSI to use.
If you were truly anal about inflation pressures,
you could always buy an inexpensive non contact thermometer to test temperatures across the tread after your drives. ~$20 USD in this country.Infrared Thermometer - Non-contact, Digital Thermometer
A uniform HOT temperature across the tread would pinpoint the correct PSI to use.
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