Hi guys,

 

I’ve just got home from a stressful long journey thanks to getting a puncture.

 

I got the 50mph limited spare fitted fine and went to check its pressure.

 

My spare is a 205/55 R16 91V

 

The wheel etc said to check my cars data sticker for the correct pressure.

 

That sticker listed my spare as a 125/70 R18 and 4.2bar - a completely different tyre! Nice and handy Skoda - not.

 

In the end I guessed at 3 bar and it got me home safe. My actually main tyres are 235/45 R18 94W

 

Can anyone tell me what the actual correct pressure is for my spare please?

 

Thanks

 

Andy

Edited 8 April, 20233 yr by boff180

Whatever you have your vehicle pressures set to, have your spare set to the greater of the two.

That way no matter what position the damaged tyre is, the spare will be suitable for front or rear. 

I have the same size spare wheel in my Superb which is set to 36 PSI.

1 hour ago, boff180 said:

Hi guys,

 

I’ve just got home from a stressful long journey thanks to getting a puncture.

 

I got the 50mph limited spare fitted fine and went to check its pressure.

 

My spare is a 205/55 R16 91V

 

The wheel etc said to check my cars data sticker for the correct pressure.

 

That sticker listed my spare as a 125/70 R18 and 4.2bar - a completely different tyre! Nice and handy Skoda - not.

 

In the end I guessed at 3 bar and it got me home safe. My actually main tyres are 235/45 R18 94W

 

Can anyone tell me what the actual correct pressure is for my spare please?

 

Thanks

 

Andy

 

Just pump the 205/55R16 tyre to 44psi once a year, when it's stored in the spare wheel well.

 

Even if the spare tyre doesn't have a slow puncture, it will still slowly go down like any other tyre over time. After a year, the 44psi might have gone down to around 38psi. This is because no tyre is 100% air tight. With bicycle tyres, you might find that you have to pump them up every two weeks as they go down a lot quicker than car tyres.

 

38psi should still be enough to get you home, as you won't be driving fast, ie. not over 50mph.

 

Even if they went down to as low as 35psi, I doubt that would cause you any problems getting home at 50mph. It's not like the tyres would overheat at such a slow speed even if the car was heavily loaded. Of course, with different tyre sizes on the same axle, you would want to be driving round corners at a gentle pace.

 

Edited 8 April, 20233 yr by Carlston

10 hours ago, ApertureS said:

no matter what position the damaged tyre is

avoid installing on front axle!

especially OEM 125/70r18 spare wheel

 

2 hours ago, MartiniB said:

avoid installing on front axle!

especially OEM 125/70r18 spare wheel

 

I mean, you should avoid putting a space saver on wherever possible.

But if I have a puncture on the front axle on the motorway, I’m not gonna be wasting time with a double wheel change, I’ll be changing that front wheel and getting out of there (cautiously)