what psi do you inflate your tires to?
06-05-15, 09:46 AM
#20
I usually inflate my tires to 37 psi and i try to not let them go lower than 35 psi for daily driving. Any higher than that and the tires follow the road more than my liking.
The issue with over inflating the tire is that it'll cause the center of the tire to wear more instead of getting an even wear across the tire.
The issue with over inflating the tire is that it'll cause the center of the tire to wear more instead of getting an even wear across the tire.
06-05-15, 12:52 PM
#21
The shop that did my set up was adamant about 36 psi all around and to check them often. So far, have been quite satisfied with the ride (but far from the stock floater ride....).
06-05-15, 11:18 PM
#24
I work at firestone and they have sent me to classes about tires. i'm not saying im an expert cause i'm not, im just willing to share the information they have provided me. if it helps you, cool, if not, cool.
basically, firestone gave me a chart that shows the comparisons between psi, and tire size.
the average tire is rated at 32-36 psi. all depends on size and manufacturer. now the higher you go, usually from 32, the wider the tire becomes. the wider it becomes, the more stabile it is, and the more traction you get. also, the tire is able to handle a higher load. but there is a point when the air is just damaging the tire more than helping it, usually 36psi, depending on the tire. again if I find the chart i'll post.
but in essence, tires are your first source of shock absorbers. without any elasticity, mostly because tires are under or overinflated, the more wear or harm you cause your suspension. overinflation also will spread the belts apart and cause the rubber to break apart from itself at the corners, easy to tell why its called "separation". lol.
its weird though because this chart shows that a tire will go up, numbers arent real because I cant remember the real numbers, about 10-15% for every 1psi increase in air in load ratings. but once it reaches 36psi it just drops to about .5% increase for every 1 psi.
basically, firestone gave me a chart that shows the comparisons between psi, and tire size.
the average tire is rated at 32-36 psi. all depends on size and manufacturer. now the higher you go, usually from 32, the wider the tire becomes. the wider it becomes, the more stabile it is, and the more traction you get. also, the tire is able to handle a higher load. but there is a point when the air is just damaging the tire more than helping it, usually 36psi, depending on the tire. again if I find the chart i'll post.
but in essence, tires are your first source of shock absorbers. without any elasticity, mostly because tires are under or overinflated, the more wear or harm you cause your suspension. overinflation also will spread the belts apart and cause the rubber to break apart from itself at the corners, easy to tell why its called "separation". lol.
its weird though because this chart shows that a tire will go up, numbers arent real because I cant remember the real numbers, about 10-15% for every 1psi increase in air in load ratings. but once it reaches 36psi it just drops to about .5% increase for every 1 psi.
06-06-15, 08:32 AM
#27
Two pretty strong votes for 36 psi, which also is pretty much the sweet spot based on everyone's replies:
http://www.discounttire.com/dtcs/infoAirPressure.do
If that's fairly linear within the meat of the typical range, with stock being 32 psi @ 16", we can probably safely assume based on that that the +1 (17") should be at least 36 psi. Whether different tire and wheel widths within the same wheel diameter will further affect that is anyone's guess...
Here's an actual Load & Inflation Table Application Guide from Toyo:
http://toyotires.com/tires-101/tire-...flation-tables
There's a lot to read through there, but a quick glance indicates 35 psi is the highest rated inflation (for their tires) for my load rating range, with very few sizes going up to 36-38-41 psi.
Edit: Interesting, following Toyo's method actually results in different psi front and back for staggered setups. Using my sizes to find the +1 psi meeting or exceeding OEM load rating:
Of course, that's for Toyo's tires and may differ for other brands. I've got a set of Toyos sitting in the garage but have Sumitomos on right now.
http://www.discounttire.com/dtcs/infoAirPressure.do
A good example would be the findings on a Honda Civic with the stock size 185/65R-14. The recommended air pressure is 28 psi. Plus one size is 195/55R-15 with a recommended air pressure of 32 psi. Plus two size is 205/45R-16 with a recommended air pressure of 36 psi. Note how the air pressure increases with plus sizing to meet the load carrying capacity for the car.
Here's an actual Load & Inflation Table Application Guide from Toyo:
http://toyotires.com/tires-101/tire-...flation-tables
There's a lot to read through there, but a quick glance indicates 35 psi is the highest rated inflation (for their tires) for my load rating range, with very few sizes going up to 36-38-41 psi.
Edit: Interesting, following Toyo's method actually results in different psi front and back for staggered setups. Using my sizes to find the +1 psi meeting or exceeding OEM load rating:
Code:
26 29 32 35 SL 94 P225/55R16 1279 1345 1411 1477 -> 1411 OEM load rating SL 93 P225/50R17 1235 1301 1367 1433 -> 35 psi SL 95 P245/45R17 1261 1351 1437 1521 -> 32 psi
Last edited by t2d2; 06-06-15 at 08:47 AM.
06-06-15, 08:47 AM
#28
it shows rim size and appropriate tire size. if you stretch tires then it wont be on that chart. but yes it shows how much load the tire will handle at each psi. it shows a little bit above to prove that anything more than a certain amout just does damage. i'll ask my coworkers for it cause I believe I threw it out. but i'll get it. 
but for the record, I keep my tires at 36 psi. I got 17x7" rims with 235/45r17 Potenza re760's which is slightly bigger than the rim's compatibility.
but for the record, I keep my tires at 36 psi. I got 17x7" rims with 235/45r17 Potenza re760's which is slightly bigger than the rim's compatibility.
06-06-15, 08:57 AM
#30
BTW, I'm vehemently opposed to tire stretching. Not only does it look absolutely awful, IMO, but I can't imagine how much it messes up things like load rating and recommended inflation.