[MikesBMW]

Recently swapped RFTs for Conti DWS tires on my stock 19"s. Loved how comfortable they were but the turn in felt too soft. Switched tire settings to account for all-seasons with speeds >100mph (very rare for me, but does happen) and the recommended pressures went up. See photo. I bumped up pressures, need to fine tune them a bit, but very much improved handling. Ride firmed up a bit but no where near the run flats. Turn in and on center feel at speed is much better than when running at 35psi all around on these Continental tires.

[harperium]

I've never run that high - will have to try it. However you do have a higher risk of hydroplaning if you are over inflated, and you may have less traction in general - something to look out for.

I usually run 2 or 3 lbs over the stock 32/35 pressures as I think it feels better.

[Fast400]

I agree with harperium. A few pounds over stock PSI may have some benefits, but I don't think 10psi over is gaining much beyond the few psi over recommended...especially as we don't see consistent 100mph over periods of time.

[MikesBMW]

Called continental and they said due to liability they can only recommend manufacturer door jam pressures regardless of tire type, operating temperature, or driving habits. Lame.

[Wgosma]

Originally Posted by MikesBMW

Called continental and they said due to liability they can only recommend manufacturer door jam pressures regardless of tire type, operating temperature, or driving habits. Lame.

But hey Mike, unrealistic to expect any other answer from mfgr or tire retailer, etc.- they told you why: liability.

[MikesBMW]

The higher 40-50 tire pressures are reflective of the warm temp of the tires too. When cold in morning they are a few PSI lower around 38 front / 43 rear. I assume this is ok.

[Fast400]

Originally Posted by MikesBMW

The higher 40-50 tire pressures are reflective of the warm temp of the tires too. When cold in morning they are a few PSI lower around 38 front / 43 rear. I assume this is ok.

It should definitely measured 'cold'!

[harperium]

if the car is fully loaded (4 passengers + luggage) you should increase the pressure too. On such road trips, I'll put in +5 (37/40).

[clivem2]

Mine are supposed to be 32 psi all-round. Goes up to 34 depending on temp. Not RFTs.

[Wgosma]

Originally Posted by harperium

if the car is fully loaded (4 passengers + luggage) you should increase the pressure too. On such road trips, I'll put in +5 (37/40).

The recommended inflation pressures listed on the door jamb sticker are for a fully loaded (passengers and cargo) car-see owners manual for details.

[Chopper45]

you will end up with excessive tyre wear in the center of the tyres.

[clivem2]

Those pressures seem really high even at 81F. What's the max the side if the tyre states it will take? 48 is incredibly high.

[Yellowmattei]

I would also say those pressures put you at higher risk for blowouts hitting a pot hole. There would be very little give in the sidewall at that pressure.

[verysideways]

The screen suggests that you should be at 41 front and 49 rear - given that those are the recommended COLD pressures for the tyres and conditions you have chosen (19" square set up and loaded/high speed) then that would suggest you're correct.

[MikesBMW]

Max pressure as noted on the side of tires is 51. And that's cold. Apparently blowouts are more common with under inflated tires. The pressure needed to burst has to be 60-80% higher than the max pressure.

Even at the pressures I'm running, the sidewalls still seem to have a ton of flex. It's still way more comfortable than the run flats.

[teaston]

Originally Posted by verysideways

The screen suggests that you should be at 41 front and 49 rear - given that those are the recommended COLD pressures for the tyres and conditions you have chosen (19" square set up and loaded/high speed) then that would suggest you're correct.

The idrive gives you the recommended pressures for the current tyre temps mate! It's dynamic and goes up and down based on the temperatures

[clivem2]

Max pressure of 51...even cold, what ever cold is...49 is too close to 51 to my mind. How accurate are the sensors?

[ContactPatch]

I don't think it would be a good idea to bring a carton of eggs home at those high pressures!

[verysideways]

Originally Posted by teaston

The idrive gives you the recommended pressures for the current tyre temps mate! It's dynamic and goes up and down based on the temperatures

Really? Didn't know that. Cheers.

[teaston]

Originally Posted by verysideways

Really? Didn't know that. Cheers.

The recommended pressures are always a bit low though, especially with winter tyres, I've put mine at 3psi above and they feel much better.

[verysideways]

Originally Posted by teaston

The recommended pressures are always a bit low though, especially with winter tyres, I've put mine at 3psi above and they feel much better.

I'm running my 19" winters at 34 front and 38 rear. See how that goes.
This will be my last season with the Blizzaks, will look forward to replacing them with something decent next time!

[HighlandPete]

Originally Posted by clivem2

Those pressures seem really high even at 81F. What's the max the side if the tyre states it will take? 48 is incredibly high.

Those are the true working pressures, not the cold setting temperatures.

Since having the electronic pressure/temperature displays, showing the dynamic, 'real-time' pressures, many are surprised how high the pressures really are, compared to the cold setting pressure.

BTW, we mustn't mix the recommended running pressures with the cold setting pressures, as if the 'recommended' pressures are going to make the pressures too high for the speed/load rating we are setting, via tire/speed selection.