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Old 11-08-2018, 11:57 AM
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Question Nitrogen stops pressure loss???

Got new front and back tires yesterday. The service desk indicated that the Road 4s would lose about 3-4 lbs of pressure a week after they are broken in.

They suggested filling with nitrogen that, according to them, does not lose pressure.

???
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Old 11-08-2018, 12:25 PM
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Re: Nitrogen stops pressure loss???

I certainly wouldn't lose any sleep over it, you get 78% nitrogen out of your air compressor.

Here's more details, but I laughed when I read: "I've dismounted tires (not mine) that had several quarts of water inside—probably from a compressed-air hose that collected water and was never purged properly."

I'm calling

https://www.popularmechanics.com/car...a3894/4302788/
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Old 11-08-2018, 12:26 PM
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Re: Nitrogen stops pressure loss???

The guy must of been joking .... I hope ?
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Old 11-08-2018, 01:08 PM
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Re: Nitrogen stops pressure loss???

As I understand it a Nitrogen atom is larger than an Oxygen atom thus air loss from the air/nitrogen the inside of the tire will be slower than Oxygen filled tire. But as noted our atmosphere contains 78% nitrogen, and compressed nitrogen from a tire store is actually 93% nitrogen, so the difference is marginal. Here's an article that is useful, https://cars.usnews.com/cars-trucks/nitrogen-in-tires
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Old 11-08-2018, 01:46 PM
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Re: Nitrogen stops pressure loss???

Quote:
Originally Posted by CJS350
As I understand it a Nitrogen atom is larger than an Oxygen atom thus air loss from the air/nitrogen the inside of the tire will be slower than Oxygen filled tire. But as noted our atmosphere contains 78% nitrogen, and compressed nitrogen from a tire store is actually 93% nitrogen, so the difference is marginal. Here's an article that is useful, https://cars.usnews.com/cars-trucks/nitrogen-in-tires




Not to mention the fact that you don't fill tires in a vacuum, so once you start inflating your tires with 93% nitrogen, you are introducing that into a tire that already has a substantial amount of air in it to start.
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Old 11-08-2018, 01:58 PM
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Re: Nitrogen stops pressure loss???

Quote:
Originally Posted by CJS350
As I understand it a Nitrogen atom is larger than an Oxygen atom thus air loss from the air/nitrogen the inside of the tire will be slower than Oxygen filled tire.

Craig, that is correct. Many tyre places in the UK offer a nitrogen fill.
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Old 11-08-2018, 03:57 PM
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Re: Nitrogen stops pressure loss???

CJS350 said: "But as noted our atmosphere contains 78% nitrogen, and compressed nitrogen from a tire store is actually 93% nitrogen, so the difference is marginal."

Gee, Craig. You seem pretty smart for a lawyer.
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Old 11-08-2018, 07:04 PM
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Re: Nitrogen stops pressure loss???

I wonder how much of a difference is just bottled Nitrogen is dry and reg air is not. Tho could the water in the tire expand enough to cause a change? Not as a liquid but as vapor? Low tires can get hot enough to melt rubber.
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Old 11-08-2018, 07:41 PM
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Re: Nitrogen stops pressure loss???

I think the main reason people use nitrogen is it is not affected by temperature change. Great for track cars and bikes., cold climates and tire stores.
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Old 11-08-2018, 09:42 PM
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Re: Nitrogen stops pressure loss???

road 4's lose 4psi A WEEK? what are they made of, permeable mesh? that kind of loss is ridiculous for a tire as small as an MC tire.

in a race environment where precise pressure is critical, nitrogen can make tuning a lot easier as it does not have the moisture that expands and contracts with heat.

in a non-race world where you don't have a nitrogen bottle with you all the time, nitrogen fills are mainly a great profit for tire stores. when your nitro filled tire drops a few psi, what are you going to do...run to the tire store to top it off? or just hook up your compressor and fill it with "air"...thereby nullifying the investment in the initial nitro fill...
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Old 11-09-2018, 12:59 AM
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Re: Nitrogen stops pressure loss???

Quote:
Originally Posted by BMW
Got new front and back tires yesterday. The service desk indicated that the Road 4s would lose about 3-4 lbs of pressure a week after they are broken in.

They suggested filling with nitrogen that, according to them, does not lose pressure.

???




I think the service guy is trying to sell ya something.
My Road 4s don't loose that much air in a month.
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Old 11-09-2018, 06:22 AM
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Re: Nitrogen stops pressure loss???

I always fill my Michelins with helium, so that when I get a puncture, at least I can enjoy a high-pitched giggle as I squat defeatedly on the roadside.
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Old 11-09-2018, 09:08 AM
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Re: Nitrogen stops pressure loss???

Quote:
Originally Posted by mcchoc
I always fill my Michelins with helium, so that when I get a puncture, at least I can enjoy a high-pitched giggle as I squat defeatedly on the roadside.
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Old 11-09-2018, 11:14 AM
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Re: Nitrogen stops pressure loss???

Service desk is full of shit if they say that PR4s GTs loose air at that rate.Been through 5-6 pairs of them and never once lost that significant amount of 78% nitrogen.
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Old 11-09-2018, 03:15 PM
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Re: Nitrogen stops pressure loss???

I’ve always felt that nitrogen in street tires is a load of hog-wash, but I am impressed that quite a few tire stores offer (and use, even if you don’t ask) nitrogen that comes from a membrane-style nitrogen separator. This seems reasonable, as you are getting a higher ratio of nitrogen than air, at zero cost to you, and very little cost to the tire store. As opposed to them having to keep and refill nitrogen bottles.

I like that Popular Mechanics q-a snippet. It was a reasoned discussion. But that “quarts of water” part is pure shiite, as previously pointed out.
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Old 11-09-2018, 06:31 PM
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Re: Nitrogen stops pressure loss???

Quote:
Originally Posted by jimmm
I wonder how much of a difference is just bottled Nitrogen is dry and reg air is not. Tho could the water in the tire expand enough to cause a change? Not as a liquid but as vapor? Low tires can get hot enough to melt rubber.




I thought the primary benefit of a nitrogen fill was that the tire ran cooler?
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