For everyday driving, nitrogen offers only marginal benefits over normal compressed air. It does hold pressure a little more steadily, which is why racing and aviation use it, but for a road car that you check monthly, ordinary air does the job and costs nothing.
What's the theory?
Normal air is already about 78% nitrogen. The argument for pure nitrogen is that its larger molecules escape through the tyre more slowly, and that it contains no moisture, so pressure stays more stable as temperatures change. Both effects are real, but small for typical road use.
The claimed benefits
- Slower pressure loss, so fewer top-ups.
- More stable pressure with temperature, less cold-weather drift.
- Less internal moisture, theoretically reducing rim corrosion.
The reality for road cars
The differences are modest. A driver who checks pressures monthly gets almost all the safety and economy benefits for free. And once you top up with ordinary air at a forecourt, the "pure nitrogen" advantage is diluted anyway.
Where nitrogen makes sense
Track cars, high-performance use, fleets that want fewer manual checks, and situations where consistent pressure is critical. For the average commuter, it's optional, not essential.
Our take
We'd rather you spent the money on good tyres and checked your pressures regularly. We fit and set tyres correctly at your location across London and Birmingham, whatever you choose to inflate with. Book a fit.
