I upped the PSI to my tires from 29 to 35 and... - Fuel Economy, Hypermiling, EcoModding News and Forum

MartialArtist · 03-27-2008, 02:41 PM

My car actually is quieter! I inflated my tires to 5 PSI under what the sidewall says.

I will see how my gas mileage plays out once I travel to MN again.

Thanks everyone.

bhazard · 03-27-2008, 02:50 PM

When I worked at a local tire shop we always inflated cars to 35. As well as small trucks and suv's/minivans. Bigger stuff pretty much got the sidewall rating.

MartialArtist · 03-27-2008, 02:52 PM

Cool, that's good to know I have it at a good spot of 35. thanks...

trebuchet03 · 03-27-2008, 02:55 PM

Quote:

Originally Posted by MartialArtist

Cool, that's good to know I have it at a good spot of 35. thanks...

Naw, bring it up to max (and beyond)

bhazard · 03-27-2008, 03:03 PM

Overinflated tire = wear in the middle of the tread.

MartialArtist · 03-27-2008, 03:04 PM

lol, I will tinker with it if I can see any gain in gas mileage...

Quote:

Originally Posted by trebuchet03

Naw, bring it up to max (and beyond)

MartialArtist · 03-27-2008, 03:13 PM

I'll take your words, will keep it at 35 since I am enjoying a more quieter ride now...

Quote:

Originally Posted by bhazard

Overinflated tire = wear in the middle of the tread.

trebuchet03 · 03-27-2008, 03:15 PM

Quote:

Originally Posted by bhazard

Overinflated tire = wear in the middle of the tread.

Prove it... Or, you need to dispose of bias tires you have and use a modern tire.

I've got my tires at 55/50 (Front/Rear) and have yet to have abnormal wear in nearly 20K miles

Plenty of other members will attest the same thing

And that said, the ratings for a tire are for the max sidewall pressure.

MartialArtist · 03-27-2008, 03:18 PM

HOLY, 55 PSI

Getting good gas mileage?

Quote:

Originally Posted by trebuchet03

Prove it... Or, you need to dispose of bias tires you have and use a modern tire.

I've got my tires at 55/50 (Front/Rear) and have yet to have abnormal wear in nearly 20K miles

trebuchet03 · 03-27-2008, 03:22 PM

Quote:

Originally Posted by MartialArtist

HOLY, 55 PSI

Getting good gas mileage?

I follow the "Always be content, but never satisfied" model

And 55psi isn't a big deal. Search Google for "Factor of Safety" - it's one of the few engineering terms that's to the point in what it is

I've been having trouble finding the FoS for modern tires, but bias ply tires were designed with an FoS between 4 and 11 with optimal FoS at 7. That's 7 times what's rated on the side. And, no doubt, modern tires at least meet this criteria. I'm not worried

Plus, added benefit of less tendency to hydroplane (something important to me given my location).