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[wakeyomega]

Hi all
I have a flyer from costco with a special offer (20% off) on Michelin 'energy saver' tyres (they say that they save on fuel) They also say that when fitted at a Costco centre they fill them with Nitrogen ("improves handling, fuel effeciency and tyre life").

I've no idea if 20% off is a good price because I don't know what the normal retail price at costco is yet, BUT.....

1. Has anybody any experience with these tyres? If so, do they really save you fuel?
2. I've never heard of Nitrogen filled - any experience out there?
3. Does anyone else use Costco for tyre supply? If so, any good?

Thanks Pat

[HGV mechanic]

nitrogen??? not sure about that :-?

prob just another money makeing scam scheme  

[Gaffers]

All I know is that nitrogen filled tyres are not prones to anything but minimal effect of expansion through heat which can lead to more even tyre wear if the geometry is perfect etc etc.

As to the claims of energy saving I dont have a scooby!!

[Albatross]

Hi all
I have a flyer from costco with a special offer (20% off) on Michelin 'energy saver' tyres (they say that they save on fuel) They also say that when fitted at a Costco centre they fill them with Nitrogen ("improves handling, fuel effeciency and tyre life").

I've no idea if 20% off is a good price because I don't know what the normal retail price at costco is yet, BUT.....

1. Has anybody any experience with these tyres? If so, do they really save you fuel?
2. I've never heard of Nitrogen filled - any experience out there?
3. Does anyone else use Costco for tyre supply? If so, any good?

Thanks Pat

The main gases in air are nitrogen, 78%. Oxygen, 21%, others, 1%. Among the others are carbon dioxide, about 0.03%, noble gases, about 0.9% and varying amounts of water vapour depending on the weather.

Sounds like you should ask them how pure their nitrogen charged tyres are.

How are you going to pump them up again?

[rad cap]

flipi eck albertross, are u a rocket man.    and yes how do you refill the tyres, not at the local forcourt ?

[Tony H]

according to some blurb I read nitrogen molecules are larger than oxygen so less prone to seeping through the construction of the tyre :-/ good point about how do you blow them up.
Costco used to be really good on tyre prices a few years ago but I have found they seem to be less competitve nowadays.It allways pays to shop around for special offers etc it's made so easy now with the internet

[Marks DTM Calib]

I take it you wish to use the overly hard and stupidly expensive Michelins on your wheel barrow.....as they dont suit cars if you drive with any spirit!

[HGV mechanic]

Hi all
I have a flyer from costco with a special offer (20% off) on Michelin 'energy saver' tyres (they say that they save on fuel) They also say that when fitted at a Costco centre they fill them with Nitrogen ("improves handling, fuel effeciency and tyre life").

I've no idea if 20% off is a good price because I don't know what the normal retail price at costco is yet, BUT.....

1. Has anybody any experience with these tyres? If so, do they really save you fuel?
2. I've never heard of Nitrogen filled - any experience out there?
3. Does anyone else use Costco for tyre supply? If so, any good?

Thanks Pat

The main gases in air are nitrogen, 78%. Oxygen, 21%, others, 1%. Among the others are carbon dioxide, about 0.03%, noble gases, about 0.9% and varying amounts of water vapour depending on the weather.
Sounds like you should ask them how pure their nitrogen charged tyres are.

How are you going to pump them up again?



steady  now

[Andy B]

....
How are you going to pump them up again?

Costco will apparently fill them up for you. I asked. Not much use if you live a distance from your nearest Costco though.

[robbo299]

I needed a new front tyre a while ago and thought i would replace like for like. Rang round and was quoted between £140 to £170  for a Michelin. Thought i would try Costco as i had used them before on my Carlton i had at the time. Costco at MK didn't have the tyre i needed in stock and the only tyre they had in my size could only be fitted as a pair, i was told, so both would need to be changed. Price was £117+vat. Didn't bother and went over road to tyre fittersand paid £125 all in for a Continental. Don't know if Costco was trying to pull proverbial wool over eyes but needed tyre done that evening as i was going to Liverpool next day. E-Tyres are worth a try as well. Good branded tyres at a good price. Would have used them instead of Costco but could'nt get tyre until next day.

[Albatross]

flipi eck albertross, are u a rocket man.    and yes how do you refill the tyres, not at the local forcourt ?

Nope, a Diver who's qualified to use "enriched air", which is basically air with less nitrogen and more oxygen and that lasts you longer.

More exact details are:

• Nitrogen (N2): 78.1%
• Oxygen (O2): 20.29%
• Carbon dioxide (CO2): 0.03%
• Water vapour: 0.4%
• Inert gas: 0.95%
• Dust particles, sulphur oxides, nitrogen oxides, etc.: variable

according to some blurb I read nitrogen molecules are larger than oxygen so less prone to seeping through the construction of the tyre :-/ good point about how do you blow them up.
Costco used to be really good on tyre prices a few years ago but I have found they seem to be less competitve nowadays.It allways pays to shop around for special offers etc it's made so easy now with the internet

Yes, but not much, as a quick comparison, we can use the covalent radius defined as 1/2 the distance between to identical covalently bonding nuclei. This is measured in picometers (1 pm= 1x 10-12 m). Nitrogen's covalent radius is 73pm so the length of a nitrogen molecule ought to be 4 X 75pm or 300 pm. A molecule of oxygen ought to be just a shade smaller 4 X 73pm or 292pm. So an oxygen molecule ought to be a little less than 3% smaller than a nitrogen molecule.

Diving, gotta be safe!

[HGV mechanic]

flipi eck albertross, are u a rocket man.    and yes how do you refill the tyres, not at the local forcourt ?

Nope, a Diver who's qualified to use "enriched air", which is basically air with less nitrogen and more oxygen and that lasts you longer.

More exact details are:

• Nitrogen (N2): 78.1%
• Oxygen (O2): 20.29%
• Carbon dioxide (CO2): 0.03%
• Water vapour: 0.4%
• Inert gas: 0.95%
• Dust particles, sulphur oxides, nitrogen oxides, etc.: variable

according to some blurb I read nitrogen molecules are larger than oxygen so less prone to seeping through the construction of the tyre :-/ good point about how do you blow them up.
Costco used to be really good on tyre prices a few years ago but I have found they seem to be less competitve nowadays.It allways pays to shop around for special offers etc it's made so easy now with the internet

Yes, but not much, as a quick comparison, we can use the covalent radius defined as 1/2 the distance between to identical covalently bonding nuclei. This is measured in picometers (1 pm= 1x 10-12 m). Nitrogen's covalent radius is 73pm so the length of a nitrogen molecule ought to be 4 X 75pm or 300 pm. A molecule of oxygen ought to be just a shade smaller 4 X 73pm or 292pm. So an oxygen molecule ought to be a little less than 3% smaller than a nitrogen molecule.
Diving, gotta be safe!

 

[TheBoy]

I use Costco, but not for tyres, as they only sell Michelin, and I wouldn't put them on a push bike.

Nitrogen is supposed to keep more even pressure over temperature.

[Marks DTM Calib]

I would have thought that it would be smaller than 4 times given they travel around as O2 and N2. Wouldn't 4 times give the size of two atoms sat next to each other...

Having said that, its been a few years since A level chemistry!

[Andy B]

....
Having said that, its been a few years since A level chemistry!

I bet it's been even longer for me since 'O' level Chemistry!