Thank you for this video. I bought a Wrangler with Kenda Klever tires with psi of 60 (max is 65 psi). We're going to do this test today and get them at a better suited psi !
Interesting video. I've heard of the chalk test but I have never done one and I figured TH-cam would have a video on it and so that's why I'm here. The door jamb sticker on my 4WD Grand Cherokee says 33F/36R, which is what I've always filled them at and rotated every 5k miles. I've averaged around 45k miles out of each set of tires by doing it this way, replacing them when the tread depth reaches 4/32. I just spent $1,400 on 4 new tires a few days ago and I want to get the most out of them, both in handing and longevity. I will be doing the chalk test soon. BTW, why didn't you do the chalk test on the front and the rear tire at the same time? It seems it would have saved some time instead of having to repeat it all over again for a second tire.
I did this on my 2011 silverado 1500 with 33 kenda klevers. I actually didn’t notice a difference in chalk pattern from 33 psi to 37 psi. Could this be normal? Only difference between both psi was 37 was a little more responsive in steering and you could feel every pebble in the road. 33 the steering almost felt loose compared to when it was at 37 but the ride is amazing. so much more cushion.
Your experience is perfectly normal! Honestly your observation of super responsive steering and "feeling every pebble" is exactly what happens with the higher psi. I'm sure the 33psi did cushion the ride, but the side wall gets softer and has more flex, therefore "loosens" the ride quality. I'd personally still run the 33psi if you were comfortable with it, but that is more user preference at that point. The big thing with why your tread pattern wouldn't exactly change is because of the actually tire carcass construction. Klevers tend to have more steel bands and a heavier rubber compound from the start. The likelihood is that you'd really have to do BIG airing up and down movements to really notice a difference in the footprint of the tire!
I believe you're likely referencing the manufacturer's advertised maximum and minimum pressures. These are optimal air pressure ratings based on the manufacturer's predetermined operating weight. Load E tires are constructed and advertised (tested) to safely handle significantly higher operating loads / weights than most Jeeps can even safely handle. Load E tires are primarily available in our industry because of the size and radial steel bands necessary to construct our oversized tires, otherwise a quality constructed Load C is sufficient for nearly all Jeep needs. Load E tires can safely operate below these advertised numbers because the actual weight of the Jeep is significantly less than what is tested and verified by the manufactures. An example is that we regularly use our 2-post automotive lifts rated at 10,000lbs to lift 3000-4000lb Jeeps. We are under utilizing the manufacturer's lift capacity, but it is very much still in a safe operating manner. If you were to run a load E tire under inflated, but with a heavy load (ie. 3/4ton trucks or bigger pulling a trailer), then yes the side wall would flex, creating friction and excess heat, leading to a potential safety concern. Great question! -SFJ4x4 -Neil
This is possibly the smartest thing I’ve seen in a while
This whole time I’ve been over inflating my tires… Thanks Jeff, this was really helpful!!
Nice! Glad we could help!
Im loving the educational content!! Keep up the great work!!
Thanks! Will do! Appreciate the support Kevin!
Thank you for this video. I bought a Wrangler with Kenda Klever tires with psi of 60 (max is 65 psi). We're going to do this test today and get them at a better suited psi !
Glad we could help!
I'm going to have to give this a try! Thanks SFJ!
You’re welcome!!
Interesting video. I've heard of the chalk test but I have never done one and I figured TH-cam would have a video on it and so that's why I'm here. The door jamb sticker on my 4WD Grand Cherokee says 33F/36R, which is what I've always filled them at and rotated every 5k miles. I've averaged around 45k miles out of each set of tires by doing it this way, replacing them when the tread depth reaches 4/32. I just spent $1,400 on 4 new tires a few days ago and I want to get the most out of them, both in handing and longevity. I will be doing the chalk test soon.
BTW, why didn't you do the chalk test on the front and the rear tire at the same time? It seems it would have saved some time instead of having to repeat it all over again for a second tire.
I did this on my 2011 silverado 1500 with 33 kenda klevers. I actually didn’t notice a difference in chalk pattern from 33 psi to 37 psi. Could this be normal? Only difference between both psi was 37 was a little more responsive in steering and you could feel every pebble in the road. 33 the steering almost felt loose compared to when it was at 37 but the ride is amazing. so much more cushion.
Your experience is perfectly normal! Honestly your observation of super responsive steering and "feeling every pebble" is exactly what happens with the higher psi. I'm sure the 33psi did cushion the ride, but the side wall gets softer and has more flex, therefore "loosens" the ride quality. I'd personally still run the 33psi if you were comfortable with it, but that is more user preference at that point. The big thing with why your tread pattern wouldn't exactly change is because of the actually tire carcass construction. Klevers tend to have more steel bands and a heavier rubber compound from the start. The likelihood is that you'd really have to do BIG airing up and down movements to really notice a difference in the footprint of the tire!
Friggen awesome
This works for slow speeds. At highway speeds won’t centrifugal force cause the center to wear more? Because the tire is under-inflated?
Realistically, no. That's part of the reason why tires have steel belts in the tread, so the tires hold their shape when driving down the highway.
Isn’t 30psi going to get hot on a E rated tire? Most start at 35 and up
I believe you're likely referencing the manufacturer's advertised maximum and minimum pressures. These are optimal air pressure ratings based on the manufacturer's predetermined operating weight. Load E tires are constructed and advertised (tested) to safely handle significantly higher operating loads / weights than most Jeeps can even safely handle. Load E tires are primarily available in our industry because of the size and radial steel bands necessary to construct our oversized tires, otherwise a quality constructed Load C is sufficient for nearly all Jeep needs. Load E tires can safely operate below these advertised numbers because the actual weight of the Jeep is significantly less than what is tested and verified by the manufactures. An example is that we regularly use our 2-post automotive lifts rated at 10,000lbs to lift 3000-4000lb Jeeps. We are under utilizing the manufacturer's lift capacity, but it is very much still in a safe operating manner. If you were to run a load E tire under inflated, but with a heavy load (ie. 3/4ton trucks or bigger pulling a trailer), then yes the side wall would flex, creating friction and excess heat, leading to a potential safety concern. Great question! -SFJ4x4 -Neil
@@SFJ4x4 thanks for your time to answer this
So you do one front tire and then one back tire?
Yes! Sorry we weren't more clear
Just did mine this weekend
Nice!
Lol he didn't even say what it was im running 36 in fronts and 30 in back on toyo rts 35 and there on a 150 .