inflate to sidewall retrospective

spaceman

Lifer
Dec 4, 2000
17,602
166
106
was the fleabag right
as a laymen, i found his arguments to be compelling
and u have to admire his advocacy
anytime someone show that amount of conviction for something so benign
i pay attention.
but im not still certain of an answer
 

lxskllr

No Lifer
Nov 30, 2004
57,685
7,912
126
Haven't seen you in awhile spaceman. I inflated my tires to sidewall this week. They were low and hot, so I figured they'd deflate to where I wanted when cool. I was only one or two pounds off. Lost four pounds, and I was looking for five or six.
 

Red Squirrel

No Lifer
May 24, 2003
67,935
12,384
126
www.anyf.ca
TBH I typically inflate to sidewall or close, but it really depends on the car. My old car said 35, so I would put 30. My current car says 25, but if I put 25 it looks like I have a flat, it's just not enough. So I put 30 and I'm good. Tire blowouts due to overinflating are no joke though... I kinda wish there was a way to put the air hose on it without having to hold it, so I could initiate pressure form a distance.

I imagine the max they put on there is rather conservative though, and takes actual driving into account, probably not going to blow just sitting there.
 

ultimatebob

Lifer
Jul 1, 2001
25,135
2,445
126
I have to fill my tires about 5 psi over spec (32) during summer in my Chevy Cruze, or the low tire pressure warnings will go off during winter. It's amazing how much the weather comes into play with tire pressure... a tire that's at spec when parked in the garage can show 27 psi when it's 0 outside, and 38 psi when it's 95.
 

sdifox

No Lifer
Sep 30, 2005
96,217
15,787
126
TBH I typically inflate to sidewall or close, but it really depends on the car. My old car said 35, so I would put 30. My current car says 25, but if I put 25 it looks like I have a flat, it's just not enough. So I put 30 and I'm good. Tire blowouts due to overinflating are no joke though... I kinda wish there was a way to put the air hose on it without having to hold it, so I could initiate pressure form a distance.

I imagine the max they put on there is rather conservative though, and takes actual driving into account, probably not going to blow just sitting there.


Err that is not to sidewall
 
Feb 25, 2011
16,823
1,493
126
So what is inflating to sidewall anyway?

Tire pressure can effect things like tread wear, mileage, ride quality, etc. There are several schools of thought re: tire pressure, including but not limited to:

1) Inflating to to manufacturer recommended tire pressure (typically 25-35 psi, depending on the car - it's on that sticker inside your door). Generally, this is recommended if you have OE or OEM-spec equipment, since the manufacturer recommendation is supposed to get you approximately the mix of handling, mileage, ride quality, etc., that you bought the car for in the first place, and takes the mass of the car into account.

2) Inflating to 80% of the maximum pressure written on the sidewall of the tire. (e.g. 40psi for a 50psi max tire) Generally, this is recommended for aftermarket tire/wheel combos, different sizes that what originally shipped with the car, etc. It's a safe middle-of-the-road thing to do when the manufacturer recommendations no longer apply. But you would want to monitor tread wear, ride quality, etc., and adjust up or down as needed, since both over-inflated and under-inflated tires cause problems.

3) Inflating to the needs of the situation. This could include lowering psi for offroading, adjusting to compensate for weather conditions, or adding 5-10 psi before storing a car to avoid forming a flat spot on the tire when it's parked. Basically you need to be the sort of nerd who carries around an air gauge and a compressor in their trunk, but some people do this.

4) Inflating to sidewall - inflating to the max pressure listed on the sidewall of the tire. I have never seen this advocated outside of ATOT, I think it's more of an in joke than actual advice. You can read the old troll thread and see what the justification is.

For a perspective on this: http://www.popularmechanics.com/cars/a940/4199963/
 
Reactions: TurtleCrusher

IronWing

No Lifer
Jul 20, 2001
69,551
27,858
136
Apr 20, 2008
10,162
984
126
Tire pressure can effect things like tread wear, mileage, ride quality, etc. There are several schools of thought re: tire pressure, including but not limited to:

1) Inflating to to manufacturer recommended tire pressure (typically 25-35 psi, depending on the car - it's on that sticker inside your door). Generally, this is recommended if you have OE or OEM-spec equipment, since the manufacturer recommendation is supposed to get you approximately the mix of handling, mileage, ride quality, etc., that you bought the car for in the first place, and takes the mass of the car into account.

2) Inflating to 80% of the maximum pressure written on the sidewall of the tire. (e.g. 40psi for a 50psi max tire) Generally, this is recommended for aftermarket tire/wheel combos, different sizes that what originally shipped with the car, etc. It's a safe middle-of-the-road thing to do when the manufacturer recommendations no longer apply. But you would want to monitor tread wear, ride quality, etc., and adjust up or down as needed, since both over-inflated and under-inflated tires cause problems.

3) Inflating to the needs of the situation. This could include lowering psi for offroading, adjusting to compensate for weather conditions, or adding 5-10 psi before storing a car to avoid forming a flat spot on the tire when it's parked. Basically you need to be the sort of nerd who carries around an air gauge and a compressor in their trunk, but some people do this.

4) Inflating to sidewall - inflating to the max pressure listed on the sidewall of the tire. I have never seen this advocated outside of ATOT, I think it's more of an in joke than actual advice. You can read the old troll thread and see what the justification is.

For a perspective on this: http://www.popularmechanics.com/cars/a940/4199963/

yes, that is what you are supposed to do. But dumdum argued that you should inflate to sidewall...

I get it's a public forum, but why do we allow this nonsense?
 
Feb 25, 2011
16,823
1,493
126
I get it's a public forum, but why do we allow this nonsense?

Because it's funny? It's generally NOT allowed in the technical forums.

I miss tweakboy.

FWIW, donut spares usually ARE supposed to be inflated to some ridiculously high psi, and IME, "hybrid" style bicycle tires generally work better for road use when inflated closer to max psi. (Lower it for better traction on gravel trails, etc.) And w/r/t cars, the old "higher psi = better mpg, 100% of the time" is a widely believed urban legend. So there's plenty of opportunity for somebody to become confused, especially if they're, well, yeah, you know. Dense.
 
Last edited:

BD231

Lifer
Feb 26, 2001
10,568
138
106
Auto mechanic space man cried and transfered schools because he doesn't believe in alternators. His entire class now hates him for it.
 
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