Had a puncture, see pics below…Question is, is Nitrogen thinner than air, as air in the tyre is holding a slow puncture whereas when it was nitro filled it was all hissing out?!
Used the bike Weds, came to it Fri and was flat. Moved it, as the last bit of the nitrogen filled tyres escaped, I located the split, as in two pics below. Some is across the Tread, some has also cut into the deeper grooved area between, concerned I can see two strands of the metal internal ply as you pull back the tread pattern on the split bit of rubber. It was still hissing out the nitrogen from the split.
Refilled it Fri night with Air. Came back Sun afternoon, it has held, and stablized, no air loss with air in the tyre. J T B Sure, I have deflated it, filled with “Comma Tyre” Can and added more air to 41psi as manf regulations.
Run for 15-20 mins to spread the tyre seal foam. It has now stabelized and no psi loss and no air hissing out of the cut in the tyre.
See my pics and the fact air is stablizing and holding in the tyre 100%, is it safe for now, I will keep a digital tyre pressure gague in my pillion undertray and keep monitoring it.
HAS The air won out over nitrogen, in this experiment then?
Thanks Pete! Google it, and there are those who fill the tyres with 100% nitrogen as it regulates the pressures to a tighter degree of +/- psi than air…if the tyre is pure and w/o faults!
Nitrogen is used in used in race bikes because it’s temperature-inert, i.e. it doesn’t expand as it heats up, so it’s easy for technicians to maintain the correct pressured regardless of whether the tyres are hot or cold, which is extremely important when swapping tyres during practice and qualifying sessions.
There’s no benefit for the road or trackday users.
Ahhh, so somebody has found a way to stop a gas expanding when it gets warm Changes the last 400 years or so since Mr Boyle last looked at this
I think it’s just that compressed nitrogen is supplied dry so there’s little or almost no moisture in it, as water expands a lot when it gets warm whereas a pure gas expands a lot less, as it’s already a gas, no state change to take place.
Sheeet! brought out in cold sweats and a remembered fear of a chalkboard eraser at the mention of Boyles Law. Mr Woolly’s Physics lessons were also about survival.
No, that’ll be down to the fact that you probably parked it on a different part of the tyre I’d be surprsied if that made any difference as air is mostly nitrogen anyway.
Anyway, bike isnt being ridden much and new tyre is on way from Busters Accessories, cause its not fun to ride at mo, constant tyre pressure checks before each ride, and feeling very stressed on the bike when riding conscious of the rear tyre all the time
It was an interesting question, nothing foolish about it. I bet there’s at least 10 people now looking to get their tyres filled with nitrogen ready for the next track day ;):DI ask questions all the time, can never know everything unless you’re Chunky and have been around since 1746
Changes the last 400 years or so since Mr Boyle last looked at this 
I’d be surprsied if that made any difference as air is mostly nitrogen anyway.
I’m only 500 miles off needing a new rear tyre so will have a go at a rolling burnout this weekend :). . .