What's an appropriate tire pressure for 225/17 Blizzack snow tires (front and back)?
02-04-2007, 07:28 PM
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Same here (38psi front, 36psi rear), in my 225/40-18 Blizzak LM-25's.
Although, admittedly, it's -10 out right now in northern IL and I haven't checked the pressure for a few days, so I'll bet I'll be a pound or two low tomorrow on the drive to work. Oh well, I'm not pulling the car out of the garage just to pump them up...brrrrrrrrrrr!!!
02-05-2007, 03:51 AM
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I run factory high-speed pressure on winter tyres (38/38 PSI).
<center><img src="http://gallery.rennlist.com/albums/albuq92/AudiS4_5098b.jpg"></center><p>My reasoning is:
1) higher pressures protect the rims and tyres more.
2) these tyres generally have softer sidewalls so benefit from higher pressures on dry roads.
3) the speed ratings on these tyres is very low and high pressures are necessary to get all of that speed rating. Higher pressures also reduce heat and possibility of a blow-out.
4) higher pressures are better for aquaplaning. This is definitely true for rain situation.
5) higher pressure will keep the tyre more stable and allow it to cut down through the snow.
Where lower pressures are probably better is on ice. When I'm ice racing I reduce the pressures to about 20 PSI. This allows the tyre to adapt a little better to the surface. Plus I know the ice is mostly flat. And it allows the sips in the tyre to fold over a little more and stay with the ice. I would think hard packed snow might also benefit from this.
I've never really seen anything written about this so this is just my own thinking.
Stephen
1) higher pressures protect the rims and tyres more.
2) these tyres generally have softer sidewalls so benefit from higher pressures on dry roads.
3) the speed ratings on these tyres is very low and high pressures are necessary to get all of that speed rating. Higher pressures also reduce heat and possibility of a blow-out.
4) higher pressures are better for aquaplaning. This is definitely true for rain situation.
5) higher pressure will keep the tyre more stable and allow it to cut down through the snow.
Where lower pressures are probably better is on ice. When I'm ice racing I reduce the pressures to about 20 PSI. This allows the tyre to adapt a little better to the surface. Plus I know the ice is mostly flat. And it allows the sips in the tyre to fold over a little more and stay with the ice. I would think hard packed snow might also benefit from this.
I've never really seen anything written about this so this is just my own thinking.
Stephen
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