Tire pressure calculation

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Aug 16, 2010 | 11:34 AM

#11

rh8234

Elite HDF Member

Joined: Jul 2005

Posts: 3,968

Likes: 34

From: Lockport Township, IL

Quote:

Originally Posted by Dumper 89

You should look around and find a tire shop that has nitrogen and have your tires filled with it. Nitrogen keeps a more constant pressure and reduces tire wear.

bull$hit. Possibly some value in a stock car running 200 MPH around a hot track, but totally unnecessary in a normal road machine. (But let's not hijak this thread to beat the dead horse about nitrogen in the tires.)

Like others have said - just check the pressure BEFORE a long ride. That is the cold pressure. After riding a while, the tires heat up and pressure rises. As long as the pressure is near specs before the ride, you should be fine.

Aug 16, 2010 | 01:01 PM

#12

roadking2000

Outstanding HDF Member

Joined: Aug 2010

Posts: 3,498

Likes: 128

Quote:

Originally Posted by Rick-e

Yes this is nonsense, air is 80% nitrogen anyway. "Premium air" anyone?

It's not nonsense. Nitrogen in tires at a 95% purity rate has less fluctuations in pressure due to temperature changes, and it also has better retention properties meaning you won't lose pressure over time. If you think otherwise, you need to inform Consumer Reports and the NHTSA because they both say that it's a fact. Consumer reports did a test from Sept 2006 till Sept 2007 that proved it. The NHTSA also says that nitrogen filled tires age less than air filled tires. What supports your "nonsense" assessment?

Aug 16, 2010 | 01:48 PM

#13

BadBobOk

Ultimate HDF Member

Joined: Dec 2006

Posts: 7,773

Likes: 7

From: Central Oklahoma

Quote:

Originally Posted by tuckertaft

I ride a HD Electra Glide Ultra Limited. In the H D owner manual, it is stated the front tire should be at 36 psi and the back tire 40 psi at cold. I live in Texas and am wondering if I should factor the heat in because the pressure will rise some with the heat or should I start out at the recommended pressures 36 / 40 psi,? Facebook friends who ride, if you would also give me your opinion.

Thanks for helping.

Mark

If you air up your tires in the garage early in the morning when its 75 degrees to 40 psi and let it set in the garage until the afternoon when it's 105 degrees in your garage, the pressure would increase to 42 psi.

Aug 16, 2010 | 02:03 PM

#14

carpetride

Elite HDF Member

Joined: Oct 2006

Posts: 4,128

Likes: 27

From: florida swamp

I always go to my local dealer and let them fill my tires with genuine HD air. It's the best you can get.

Aug 16, 2010 | 02:14 PM

#15

Robmitch49

Cruiser

Joined: Dec 2009

Posts: 249

Likes: 3

From: Central Texas

Quote:

Originally Posted by Dumper 89

You should look around and find a tire shop that has nitrogen and have your tires filled with it. Nitrogen keeps a more constant pressure and reduces tire wear.

I use a nitrogen mix in all my tires. 78% nitrogen.

Aug 16, 2010 | 03:48 PM

#16

Eyespy

Road Warrior

Joined: May 2006

Posts: 1,423

Likes: 0

From: Southern California High Desert, here and there....

I always start out a new tire with a special blend of 79% Nitrogen, about 20% O2, and just under 1% other gases. This start out mix permits more 02 to leak out preferentially as compared to the Nitrogen, by virtue of the smaller molecular radius of the Oxygen gas. Over time, this mixed gas tire inflation strategy produces a gradual increased concentration of in-tire Nitrogen gas as the Oxygen levels drop off.