<div dir="ltr">Thanks, Rick. You're the best! (But I tell everybody that.)<div><br></div><div>Here is some info from TireRack. I may be incorrect about the 32 degree thing, but basically they explain it better than I. Read more at TireRack.com. </div><div><br></div><div><p style="outline:none;border:0px;margin:0px 0px 16px;padding:0px;font-family:aleoregular;font-size:medium;line-height:20px;color:rgb(25,23,13)">"The rule of thumb is for every 10° Fahrenheit change in air temperature, tire pressures will change about 2% (up with higher temperatures and down with lower). This means that light-duty, standard-pressure tires (typically inflated to 30-50 psi) used in applications on cars, vans and light trucks will change by about 1 psi; ...</p><p style="outline:none;border:0px;margin:0px 0px 16px;padding:0px;font-family:aleoregular;font-size:medium;line-height:20px;color:rgb(25,23,13)">"In most parts of North America, the difference between average summer and winter temperatures is about -50° Fahrenheit...which results in a potential loss of about 5 psi as winter's temperatures set in...</p><p style="outline:none;border:0px;margin:0px 0px 16px;padding:0px;font-family:aleoregular;font-size:medium;line-height:20px;color:rgb(25,23,13)">"Additionally, the difference between cold nighttime temperatures and hot daytime temperatures in most parts of the country is about 20° Fahrenheit. This means that after setting tire pressures first thing in the morning, the vehicle's tire pressures will be almost 2 psi higher when measured in the afternoon (if the vehicle was parked in the shade). While that is expected, the problem is when you set your vehicle's tire pressures in the heat of the day, their cold pressures will probably be 2 psi low the following morning.</p><p style="outline:none;border:0px;margin:0px 0px 16px;padding:0px;font-family:aleoregular;font-size:medium;line-height:20px;color:rgb(25,23,13)">"And finally, if the vehicle is parked in the sun, the sun's radiant heat will artificially and temporarily increase tire pressures.</p><p style="outline:none;border:0px;margin:0px 0px 16px;padding:0px;font-family:aleoregular;font-size:medium;line-height:20px;color:rgb(25,23,13)">"We put some of these theories to the test at the Tire Rack. First, we mounted two tires on wheels. We let them sit overnight to equalize and stabilize their temperatures and pressures. The following morning we set them both to 35 psi. One tire and wheel was placed in the shade while the other was placed directly in the sun. We then monitored the ambient temperatures, tire temperatures and tire pressures through the day. As the day's temperatures went from 67° to 85° Fahrenheit, the tire that was kept in the shade went from our starting pressure of 35 psi to a high of 36.5 psi. The tire that was placed in the sun and subject to the increase in ambient temperature plus the sun's radiant heat went from our starting pressure of 35 psi to a high of 40 psi. In both cases, if we had set our tire pressures in the afternoon under the conditions of our evaluation, they would have been between 2 and 5 psi low the following morning...</p><p style="outline:none;border:0px;margin:0px 0px 16px;padding:0px;font-family:aleoregular;font-size:medium;line-height:20px;color:rgb(25,23,13)">"It's important to remember that your vehicle's recommended tire pressure is its cold tire inflation pressure. It should be checked in the morning before you drive more than a few miles, or before rising ambient temperatures or the sun's radiant heat affects it.</p><p style="outline:none;border:0px;margin:0px 0px 16px;padding:0px;font-family:aleoregular;font-size:medium;line-height:20px;color:rgb(25,23,13)">"And by the way, if you live in the North and park in an attached or heated garage you will lose pressure when you leave its warmth and venture into the real world outside during winter. Add 1 psi cold tire pressure to compensate for each 10° Fahrenheit temperature difference between the temperature in the garage and outside."</p></div><div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div>So I guess what they are saying is that you should check your tires pressure every few minutes whilst driving. </div><div><br></div><div>Allen Hefner</div>
<div>Norristown, PA</div>
<div> </div>
<div><em>Current:</em></div>
<div>2016 Subaru outback somewhere</div><div>2006 Chebbie</div>
<div><em>Former:</em></div>
<div>1963 Sunbeam Alpine Series III</div>
<div>1967 Triumph TR4A IRS</div>
<div>1964 VW Type I</div>
<div>1967 VW Type II</div>
<div>1967 Rover 2000TC</div>
<div>1977 MG Midget (Sniff!)</div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Tue, Aug 28, 2018 at 8:39 AM Rick Fisk <<a href="mailto:refisk@chartermi.net">refisk@chartermi.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div>Allen,</div><div id="m_-3911183761332666017AppleMailSignature"><br></div><div id="m_-3911183761332666017AppleMailSignature">Not wanting to start anything here, but your tire pressure recommendations don't make sense to me. I've never seen the recommended tire pressure is at 32 degrees F spec in a manual anywhere. ??? Seems to me the tire pressure should be the same no matter what the temperature is.</div><div id="m_-3911183761332666017AppleMailSignature"><br></div><div id="m_-3911183761332666017AppleMailSignature">For every 10 degree F rise in air temperature the pressure in your tires will rise about 1 psi and fall 1 psi for every 10 degree drop in temperature. So to maintain the car manufacturer's recommended tire pressure you should reduce the pressure when the temp goes up and raise it when the temp drops.</div><div id="m_-3911183761332666017AppleMailSignature"><br></div><div id="m_-3911183761332666017AppleMailSignature">Why would you always add 5 psi to the recommended pressure? Seems to me the car manufacturer probably knows best when it comes to recommended tire pressures for their cars. </div><div id="m_-3911183761332666017AppleMailSignature"><br></div><div id="m_-3911183761332666017AppleMailSignature">Rick</div><div id="m_-3911183761332666017AppleMailSignature"><br>Sent from my keyboard</div><div><br>On Aug 27, 2018, at 10:39 AM, Allen Hefner via Spridgets <<a href="mailto:spridgets@autox.team.net" target="_blank">spridgets@autox.team.net</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">Don't forget that the recommended tire pressure in the manuals is at 32 degrees. You usually add 1 PSI for every 10 degrees above freezing. Nobody seems to know that anymore. The manuals just say ## PSI cold. I always just add 5 PSI to the recommended pressure. <div><br clear="all"><div><div dir="ltr" class="m_-3911183761332666017gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div>Allen Hefner</div>
<div>Norristown, PA</div>
<div> </div>
<div><em>Current:</em></div>
<div>2016 Subaru outback somewhere</div><div>2006 Chebbie</div>
<div><em>Former:</em></div>
<div>1963 Sunbeam Alpine Series III</div>
<div>1967 Triumph TR4A IRS</div>
<div>1964 VW Type I</div>
<div>1967 VW Type II</div>
<div>1967 Rover 2000TC</div>
<div>1977 MG Midget (Sniff!)</div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Tue, Aug 21, 2018 at 1:40 PM John Farley via Spridgets <<a href="mailto:spridgets@autox.team.net" target="_blank">spridgets@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">I am running 175/70 R13s on my 1275+ Bugeye with front disc brakes. What are folk’s recommendations for tire air pressures & lug nut torque?</div><div dir="auto">The manual seems low for both. </div><div dir="auto">Thanks, John F.</div>
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