02-29-2020, 06:30 AM
I’m a new to me owner of coach 590
New 315/80 22.5 michelin tires
Yesterday on maiden trip, had someone abruptly change lanes in front of me that prompted heavy braking. The tag axle tires locked up and slide a short distance putting a noticeable flat spot in both sides of tag axle tires.
I went to cat scales and weighed several times with various axles and setting of tag switch.
After reviewing data and checking Michelins website for recommended tire pressures for various weights, I have a few questions
1- is it ok to run with tag switch in up position which increases weight on tag axle
2- according to the chart, I should run 130 psi in steer tires, 90 in drive and tag tires. Does this seem reasonable with weights?
3 Are those pressures cold psi or operating pressures? My tire pressures in go up 20-25psi from 40 degree cold to 70 degree afternoon interstate driving. For example, do I start out with steers at 110 so they are 130ish at operating temp or start at 130 and they operate at 150 psi?
Below are my weights full of fuel, 3/4 tank of water , empty black
Tag switch in middle position
This is position it was in when locked up and flatspotted tag axle tires
Steers 17780
Drive 24980
Tag 9780
Tag switch in bottom (increase traction) location I guess used for tight turns or icey roads?
Steers 16800
Drive 32600
Tag 3360
Tag switch up (decrease traction )
This is position looks to me to better balance rv and increase stopping power
Any problem running like this all the time?
Steers 18040
Drive 22880
Tag 11560
Just for reference, I had my tire pressures yesterday (my first day out with Newell)
Steers 130psi 39 degrees in am—— 151psi 77 degrees operating by 2pm traveling on 95 interstate
Drives 120 psi cold——— 135 psi 72 degrees operating
Tag 120 psi cold ——— 137 psi. 84 degrees which I guess where higher than drives due to heated air from drives being directly in front of them. This was after flatspotting and i had tag switch in up position the rest of day
This morning it is 40 degrees and I was thinking to start out with
120psi in steers cold and 100 in drives and tags cold to see how it does unless you guys recommend differently
Thankyou in advance
David and Mimi
New 315/80 22.5 michelin tires
Yesterday on maiden trip, had someone abruptly change lanes in front of me that prompted heavy braking. The tag axle tires locked up and slide a short distance putting a noticeable flat spot in both sides of tag axle tires.
I went to cat scales and weighed several times with various axles and setting of tag switch.
After reviewing data and checking Michelins website for recommended tire pressures for various weights, I have a few questions
1- is it ok to run with tag switch in up position which increases weight on tag axle
2- according to the chart, I should run 130 psi in steer tires, 90 in drive and tag tires. Does this seem reasonable with weights?
3 Are those pressures cold psi or operating pressures? My tire pressures in go up 20-25psi from 40 degree cold to 70 degree afternoon interstate driving. For example, do I start out with steers at 110 so they are 130ish at operating temp or start at 130 and they operate at 150 psi?
Below are my weights full of fuel, 3/4 tank of water , empty black
Tag switch in middle position
This is position it was in when locked up and flatspotted tag axle tires
Steers 17780
Drive 24980
Tag 9780
Tag switch in bottom (increase traction) location I guess used for tight turns or icey roads?
Steers 16800
Drive 32600
Tag 3360
Tag switch up (decrease traction )
This is position looks to me to better balance rv and increase stopping power
Any problem running like this all the time?
Steers 18040
Drive 22880
Tag 11560
Just for reference, I had my tire pressures yesterday (my first day out with Newell)
Steers 130psi 39 degrees in am—— 151psi 77 degrees operating by 2pm traveling on 95 interstate
Drives 120 psi cold——— 135 psi 72 degrees operating
Tag 120 psi cold ——— 137 psi. 84 degrees which I guess where higher than drives due to heated air from drives being directly in front of them. This was after flatspotting and i had tag switch in up position the rest of day
This morning it is 40 degrees and I was thinking to start out with
120psi in steers cold and 100 in drives and tags cold to see how it does unless you guys recommend differently
Thankyou in advance
David and Mimi
#590
F-150 Toad
David and Mimi
Apollo Beach Florida