Nissan Juke : Juke Forums banner
1 - 20 of 28 Posts

·
Registered
Joined
·
131 Posts
Discussion Starter · #1 ·
Most people just take their tire pressure for granted. They don't realize it plays a big role on how their car handles as well as their gas mileage. Lowering your tire pressure increase grip but also decreases gas mileage. While increasing your tire pressure reduces grip but improves gas mileage. Just wondering what you guys use for tire pressure on your daily drivers? Personally I run 38 for my fronts and 42 for my rears on my rwd car. I found that I get pretty good gas mileage and also decent grip with that setup.
 

·
Registered
Joined
·
20 Posts
Run at the manufacturer selected pressure. The factory setting takes into account vehicle load and suspension set-up. The tire is designed to give a good footprint and operate under the loads given by the manufacturer. Deviating from this, will change the behavior of the vehicle in many ways. Most of them bad.

Underinflation:
Contrary to popular belief, under inflation does not improve handling. It reduces the footprint meaning less contact with the road. It causes more roll in the tire from lateral forces. It causes severe shoulder wear. It causes high heat build-up in the shoulder, apex and sidewall. It causes reduced gas mileage. Nothing good comes from lowering tire pressure on pavement.

Overinflation:
Overinflation will improve gas mileage. It will change the footprint reducing grip in dry, wet, and snow conditions. Overinflation will also increase wear in the center of the tire. What you make up for in gas, you will lose in tire milage while reducing handling. Over inflate if you are hypermiling with your buddies.
 

·
Registered
Joined
·
122 Posts
I checked the pressure on my tires when I first got the car, and they were all about 37.
 

·
Super Moderator
Joined
·
6,376 Posts
As odd as it may seem my, Subaru WRX requires 32 up front and 29 in the rear with stock 16" rims and 33 up front and 32 in the rear with 17" rims. Dealer told me it has to do with the AWD split and rear spoiler.

Here's some excellent information from Tire Rack.
Tire Tech Information/Air Pressure: Tire Rack
 

·
Registered
Joined
·
103 Posts
Sorry for the Tire Rack link, it looks like it's not allowed on this site.

How's the ride quality with 40psi?
I'm running General Altimax winter tires on the OEM wheels...just a tad stiffer ride. No problems so far, had them installed on Friday 12/17/10.
 

·
Registered
Joined
·
360 Posts
I'm running General Altimax winter tires on the OEM wheels...just a tad stiffer ride. No problems so far, had them installed on Friday 12/17/10.
How do you like the Generals? I've got a set ready to go on my Juke when i get it. They have some great reviews.
 

·
Registered
Joined
·
103 Posts
How do you like the Generals? I've got a set ready to go on my Juke when i get it. They have some great reviews.
Wish we could get a decent amount of snow around here to give you a first hand review. They do look nicely aggressive and the only reason I went to 40PSI was because some guy on the Tire Rack review said his car drove better that way. I have to agree...I went down to 35PSI today and it feels like my car wanders a bit on dry pavement.
 

·
Registered
Joined
·
360 Posts
Thanks - i got my Juke now and i think i will bolt them on today.

I'm looking forward to some snow too, but i hate to get my Juke dirty.
 

·
Registered
Joined
·
100 Posts
Wish we could get a decent amount of snow around here to give you a first hand review. They do look nicely aggressive and the only reason I went to 40PSI was because some guy on the Tire Rack review said his car drove better that way. I have to agree...I went down to 35PSI today and it feels like my car wanders a bit on dry pavement.
In french Nissan shop, the nominal pressure is 36PSI.

It seems already hight .
 

·
Registered
Joined
·
165 Posts
I have the stock Goodyears
I just lower the air pressure for a softer ride yesterday.
28 in the front
26 in the rear
I immediately noticed the difference on the ride and the reduced road noise.
I'm not worried about gas milege

Had my Froginator for 2 months 600 miles.
Still breaking her in.
 

·
Registered
Joined
·
849 Posts
I have the stock Goodyears
I just lower the air pressure for a softer ride yesterday.
28 in the front
26 in the rear
I immediately noticed the difference on the ride and the reduced road noise.
I'm not worried about gas milege

Had my Froginator for 2 months 600 miles.
Still breaking her in.

I would suggest trying something less drastic. 10 psi is alot of pressure drop. 36 is the recommended pressure for the vehicle load. You are running way under pressure, as a result, yes you are getting a softer ride because there is less air in the tire and you are getting more side wall flex.

You're goign to cause an increase in tire wear, especially side wall strenght reduction. Not to mention the decreased footprint you now have. THere is plenty of documentation available about running with too low a tire pressure. Go to the Tire Rack - Your performance experts for tires and wheels and read up. THere are tire manufacturer provided photos of how much grip you are loosing due to a severe under inflation. You are currently running @33% under inflated. Far too much. Try to keep your numbers with in 10% of the rated load.

THe stock eagle tires are just crap. They are hard and noise. IT's just a crap tire and a fact of life. If the tire bothers you that much replace it with a touring tire for increased ride comfort. Decreaseing the tire pressure to make a bad tire feel good is not the right direction to go.

For the rest of you peeps wondering what the best tire pressure is. Read the door jam on your drivers side. It has the correct pressure for you particular model.

Unless you change your tire/rim package there is no reason to alter from this number. This number is a calculated number based on the vehicles weight and distribution to provide optimum effeciency in both grip and economy.

Anythign more than 10% above or below this number and you have over or under inflated your tire and therefore caused a reduction in grip.

I dare say that TIRE GRIP is the SINGLE MOST IMPORTANT part of you car's operation. Everything your car does (cept maybe a/c perferformance and your wiper blades) depends on this factor. How well you car brakes, accelerates, handles an emergency manuver, all this relies on your tires.

Run your tires in the recommended tire pressure window and stay safe. IMO, gaining a 2mpg from over inflating your tire by 10 psi is not worth the risk to yourself or another due to reduced tire traction.

Also, there are very few tires/rim options that will actually change your air pressure needs. Most tires follow a standerized pressure rating. There are a few that don't. The front tires I have on my del sol (Fusion ZRi's) don't. So long as your tires follow the standarized pressure ratings you dont' change your tire pressure. That means if you go from a 215/45/18 to a 245/25/20 tire, the pressure stays the same. Lower profile tires don't need more air, the side walls are stiffer to account for their reduced height. If the load rating on the tire is the same, then the pressure is to follow the manufactures (car, not the tire) pressure numbers.

Don't look at that number on teh side wall either. It's meaningless to the average consumer. For example, our goodyear RS-A tires are rated [email protected] This means that inorder to run the tire at it's maxium load of 1433 lbs you need a tire inflation pressure of 44psi cold. If you inflate your tires to 44psi, then you are expecting a maxiumum load of 5732 lbs. Our Jukes are heavy, but ****.. they're not that heavy. You're a ton over in your expected weight, buy doing this. That much of a weight offset and you WILL see a reduction in tire traction. You're just too far off the mark. This is why our are set at @36 psi. At that pressure the expected vehicle weight is the Juke's wieght plus it's maxiumum payload capacity.

There are more factors involved, such as front/rear weight bias etc. but I hope you get the idea of what's going on.

Simply put. Inflate to the car's spec tag for maximum life expectancy. (of both the tire and yourself)
 

·
Registered
Joined
·
170 Posts
I would suggest trying something less drastic. 10 psi is alot of pressure drop. 36 is the recommended pressure for the vehicle load. You are running way under pressure, as a result, yes you are getting a softer ride because there is less air in the tire and you are getting more side wall flex.

You're goign to cause an increase in tire wear, especially side wall strenght reduction. Not to mention the decreased footprint you now have. THere is plenty of documentation available about running with too low a tire pressure. Go to the Tire Rack - Your performance experts for tires and wheels and read up. THere are tire manufacturer provided photos of how much grip you are loosing due to a severe under inflation. You are currently running @33% under inflated. Far too much. Try to keep your numbers with in 10% of the rated load.

THe stock eagle tires are just crap. They are hard and noise. IT's just a crap tire and a fact of life. If the tire bothers you that much replace it with a touring tire for increased ride comfort. Decreaseing the tire pressure to make a bad tire feel good is not the right direction to go.

For the rest of you peeps wondering what the best tire pressure is. Read the door jam on your drivers side. It has the correct pressure for you particular model.

Unless you change your tire/rim package there is no reason to alter from this number. This number is a calculated number based on the vehicles weight and distribution to provide optimum effeciency in both grip and economy.

Anythign more than 10% above or below this number and you have over or under inflated your tire and therefore caused a reduction in grip.

I dare say that TIRE GRIP is the SINGLE MOST IMPORTANT part of you car's operation. Everything your car does (cept maybe a/c perferformance and your wiper blades) depends on this factor. How well you car brakes, accelerates, handles an emergency manuver, all this relies on your tires.

Run your tires in the recommended tire pressure window and stay safe. IMO, gaining a 2mpg from over inflating your tire by 10 psi is not worth the risk to yourself or another due to reduced tire traction.

Also, there are very few tires/rim options that will actually change your air pressure needs. Most tires follow a standerized pressure rating. There are a few that don't. The front tires I have on my del sol (Fusion ZRi's) don't. So long as your tires follow the standarized pressure ratings you dont' change your tire pressure. That means if you go from a 215/45/18 to a 245/25/20 tire, the pressure stays the same. Lower profile tires don't need more air, the side walls are stiffer to account for their reduced height. If the load rating on the tire is the same, then the pressure is to follow the manufactures (car, not the tire) pressure numbers.

Don't look at that number on teh side wall either. It's meaningless to the average consumer. For example, our goodyear RS-A tires are rated [email protected] This means that inorder to run the tire at it's maxium load of 1433 lbs you need a tire inflation pressure of 44psi cold. If you inflate your tires to 44psi, then you are expecting a maxiumum load of 5732 lbs. Our Jukes are heavy, but ****.. they're not that heavy. You're a ton over in your expected weight, buy doing this. That much of a weight offset and you WILL see a reduction in tire traction. You're just too far off the mark. This is why our are set at @36 psi. At that pressure the expected vehicle weight is the Juke's wieght plus it's maxiumum payload capacity.

There are more factors involved, such as front/rear weight bias etc. but I hope you get the idea of what's going on.

Simply put. Inflate to the car's spec tag for maximum life expectancy. (of both the tire and yourself)
I agree 100% with Jersey Devil. Eventually the OEMs will wear out and you can opt for a decent set of rubber. Until then, keep the inflation where it needs to be and grin & bear it.
 

·
Registered
Joined
·
233 Posts
When I bought my Juke the dealer had the tires at a ridiculous 42+ psi. It rode terrible and made a lot of noise. I dropped them to 33 and the ride quality is much improved (no different in mpg either). Unless you are autocrossing or towing a load/fully loaded I would stay away from the max end of the range.
 

·
Registered
Joined
·
85 Posts
I would suggest trying something less drastic. 10 psi is alot of pressure drop. 36 is the recommended pressure for the vehicle load. You are running way under pressure, as a result, yes you are getting a softer ride because there is less air in the tire and you are getting more side wall flex.

You're goign to cause an increase in tire wear, especially side wall strenght reduction. Not to mention the decreased footprint you now have. THere is plenty of documentation available about running with too low a tire pressure. Go to the Tire Rack - Your performance experts for tires and wheels and read up. THere are tire manufacturer provided photos of how much grip you are loosing due to a severe under inflation. You are currently running @33% under inflated. Far too much. Try to keep your numbers with in 10% of the rated load.

THe stock eagle tires are just crap. They are hard and noise. IT's just a crap tire and a fact of life. If the tire bothers you that much replace it with a touring tire for increased ride comfort. Decreaseing the tire pressure to make a bad tire feel good is not the right direction to go.

For the rest of you peeps wondering what the best tire pressure is. Read the door jam on your drivers side. It has the correct pressure for you particular model.

Unless you change your tire/rim package there is no reason to alter from this number. This number is a calculated number based on the vehicles weight and distribution to provide optimum effeciency in both grip and economy.

Anythign more than 10% above or below this number and you have over or under inflated your tire and therefore caused a reduction in grip.

I dare say that TIRE GRIP is the SINGLE MOST IMPORTANT part of you car's operation. Everything your car does (cept maybe a/c perferformance and your wiper blades) depends on this factor. How well you car brakes, accelerates, handles an emergency manuver, all this relies on your tires.

Run your tires in the recommended tire pressure window and stay safe. IMO, gaining a 2mpg from over inflating your tire by 10 psi is not worth the risk to yourself or another due to reduced tire traction.

Also, there are very few tires/rim options that will actually change your air pressure needs. Most tires follow a standerized pressure rating. There are a few that don't. The front tires I have on my del sol (Fusion ZRi's) don't. So long as your tires follow the standarized pressure ratings you dont' change your tire pressure. That means if you go from a 215/45/18 to a 245/25/20 tire, the pressure stays the same. Lower profile tires don't need more air, the side walls are stiffer to account for their reduced height. If the load rating on the tire is the same, then the pressure is to follow the manufactures (car, not the tire) pressure numbers.

Don't look at that number on teh side wall either. It's meaningless to the average consumer. For example, our goodyear RS-A tires are rated [email protected] This means that inorder to run the tire at it's maxium load of 1433 lbs you need a tire inflation pressure of 44psi cold. If you inflate your tires to 44psi, then you are expecting a maxiumum load of 5732 lbs. Our Jukes are heavy, but ****.. they're not that heavy. You're a ton over in your expected weight, buy doing this. That much of a weight offset and you WILL see a reduction in tire traction. You're just too far off the mark. This is why our are set at @36 psi. At that pressure the expected vehicle weight is the Juke's wieght plus it's maxiumum payload capacity.

There are more factors involved, such as front/rear weight bias etc. but I hope you get the idea of what's going on.

Simply put. Inflate to the car's spec tag for maximum life expectancy. (of both the tire and yourself)
Thanks!!! This is why I love forums!!
 
1 - 20 of 28 Posts
Top