red
Diesel User
Posts: 116
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Post by red on Sept 2, 2006 23:12:18 GMT -5
just a quick question, since I've only ever delt with 'standard' tires... My Aveo has low profile 17" rims and tires, the tires say 44psi.. right now (from the dealer) they are at about 28psi.. normal for regular tires.. should I run them at 40 psi? little less to protect the rims..?? I bet that could be cutting down on my fuel economy.. just running at 44 psi on the streets seems high...
thx!
J
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exodus
Nitrous User
Posts: 886
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Post by exodus on Sept 3, 2006 1:03:33 GMT -5
30-40 COLD PSI.
I run 30-35 for dry/wet tarmac. down to 25-30 for snow. up to 40 for dirt/gravel.
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AvEoblue
Idle User
Drive it like you rented it
Posts: 42
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Post by AvEoblue on Sept 3, 2006 1:38:17 GMT -5
I had my tires at 35, just for kicks, I juiced them up to 50. I gained 3 mpg no lie. I didn't believe it so I aired them back down & lost 3 mpg. So now they are at 60 psi of nitrogen. I can sacrifice comfort for more mpg, if they pop thats an excuse to buy new.
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Post by AveoSam on Sept 3, 2006 8:35:15 GMT -5
just a quick question, since I've only ever delt with 'standard' tires... My Aveo has low profile 17" rims and tires, the tires say 44psi.. right now (from the dealer) they are at about 28psi.. normal for regular tires.. should I run them at 40 psi? little less to protect the rims..?? I bet that could be cutting down on my fuel economy.. just running at 44 psi on the streets seems high... thx! J i run a little above 40 on my 205/40/17 tires
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Post by Brian5475E on Sept 3, 2006 9:14:39 GMT -5
I run mine at 30 psi
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exodus
Nitrous User
Posts: 886
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Post by exodus on Sept 3, 2006 15:39:43 GMT -5
I had my tires at 35, just for kicks, I juiced them up to 50. I gained 3 mpg no lie. I didn't believe it so I aired them back down & lost 3 mpg. So now they are at 60 psi of nitrogen. I can sacrifice comfort for more mpg, if they pop thats an excuse to buy new. At 50psi you're most definitely sacrificing traction, also. There's no way all of the tread is hitting the ground.
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red
Diesel User
Posts: 116
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Post by red on Sept 3, 2006 17:12:37 GMT -5
ok thanks.. I'll put them up to a cold 40 PSI.. not sure why the dealer would have them so low...
not sure that 50 is such a good idea.. doubt your tires are rated for that.. there is a reason for the max PSI rating...
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aveoike
Premium Unleaded User
4-Sale
Posts: 677
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Post by aveoike on Sept 4, 2006 15:06:52 GMT -5
40 on the 18's, 32-35 on the 14's.
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Post by subachad on Sept 5, 2006 11:01:07 GMT -5
36 front 34 rear for me... any less than 33 and the car tends to squirm on the track
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vincentvii
Diesel User
Section 9 employee
Posts: 109
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Post by vincentvii on Sept 20, 2006 19:38:05 GMT -5
I keep mine at about 35psi at all four corners on stock alloys.
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kw
Idle User
Posts: 65
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Post by kw on Nov 17, 2007 12:21:14 GMT -5
Pumped my stock Hankook 420s up to sidewall rating of 44 psi for better fuel economy. Considered going higher, but would have no good excuses if I suffered a tire problem. As to going higher, there is a safety factor but I don't know how much. At higher pressures, the ride is certainly affected (stiffer). The steering is quicker and requires less effort.
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Post by mtlswift on Nov 17, 2007 22:17:34 GMT -5
Pumped my stock Hankook 420s up to sidewall rating of 44 psi for better fuel economy. Considered going higher, but would have no good excuses if I suffered a tire problem. As to going higher, there is a safety factor but I don't know how much. At higher pressures, the ride is certainly affected (stiffer). The steering is quicker and requires less effort. Sidewall is MAX pressure and you should never drive that way. Hopefully you don't hit anything on the road or you'll risk a blowout. Also at that pressure, you're contact patch is miniscule and you're guaranteed to wear out the center tread. FWIW, since FWD cars are front weight biased, I'm running 35 fronts, 31 rears.
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kw
Idle User
Posts: 65
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Post by kw on Nov 25, 2007 21:15:57 GMT -5
The pressure given on the tire sidewall is the maximum SAFE pressure at which the tire was designed to operate with maximum load.
Manufacturers generally specify lower pressures as a compromise in characteristics between ride comfort, handling, wear and mileage. And their decision is the best compromise for most drivers for the complete cycle of a tire, from new all the way down to the low tread indicators.
Anytime you hit anything on the road, your tires can be damaged. Chances of a blowout are always present, but I doubt they are increased by any statistically significant amount as long as I remain within the specified range of pressures.
As you all recall, Ford recommended a very low tire pressure for their Explorers (for a comfortable ride), and at speeds above the speed limits, they suffered fatigue induced tread separation and rollovers when heavily loaded. The tire manufacturer recommended a higher pressure. However, Ford won the lawsuit and Bridgestone had to pay.
Since I've worn out countless tires on the outer edges, it is comforting to believe that I will finally wear out a set of tires towards the middle. They'll probably last longer than in the past when I religiously maintained the pressures printed on the door.
As to tire contact with the road, I imagine that as tire pressure increases, the footprint decreases, but even at maximum sidewall pressure, this is far from "miniscule." Please quantify the difference considering a new set of tires.
I finally exceeded 40 MPG, bringing my last 6 tanks up to an average of 39.3 MPG, and increasing my total overall combined mileage for 45,000 miles, up to 33.9 MPG. This has saved me over $2,000 compared to what my previous vehicle could do (21.5 MPG), at the gas prices over the past 2.5 years.
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