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Discussion Starter · #1 ·
Hi, First post to the forum. I've just had winter tyres fitted to my 1.6 TDi, 225/45 R17 94V which is exactly the same size as the tyres that were taken off and were fitted when I bought the car new. I know the pressures to run my normal tyres but there is nothing in the owners manual about what pressure I should run winter tyres at. Should I use the standard pressures or adjust them at all?
 

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You can run them 1 or 2 lb lower, but they will cause more road
resistance, and a loss of MPG. Also, if the front end is not in line
you'll chew them up faster. Dry pavement, they'll run hotter.

I never run them low, I just use what the door sticker says. I run
a few lb higher in front in the no snow on the roads seasons...
 

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Discussion Starter · #3 ·
Thanks 2013Tdi. I figured that they were best at the normal pressures so that's exactly what I'll do. The old perceived wisdom was that in snow you reduce the pressure in your tyres so I thought I'd ask. I don't want to wear the things out in the first month :)
 

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Fact of the matter is, tire pressure usually lowers itself in winter due to the
cold, then raises itself in summer; hot air expands. It requires no action your
part, besides keeping the pressure at the level recommended on the sticker
Under normal loads, inflate tires according to the vehicle manufacturer's
recommendations, NOT the maximum pressure listed on the sidewall. In any
case, one should never exceed this maximum pressure.

Also, if you try and fill your tires HOT, they will be under inflated once
the car sits. Filling cold, COLD, pressure will be higher once they warm
up.

Precise tire pressure, anyway, is with the tire off the road. When you fill your
tires to 33lbs while under the weight of the car, people are not taking that into
consideration. 33lbs under the car weight would be 31 or less if you jacked
the car up and did it again.
 

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Discussion Starter · #5 ·
Thanks. Yes I knew about the hot and cold thing but had never considered the business of them being under load and thus changing the reading. Have put them to the standard pressure for the car and in the cold.
 

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You fitted your winter tyres in May? Was there any particular reason why that I'm missing?
The posts were submitted in early December 2017 (12-05 through 12-07, 2017).
 
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