New tyre day

[pluc99]

I have my cross climates at 50 as they were wearing too much on the outer portion of tread...at 50 they are better but not completely even on the fronts - raising the fronts to 53 to see if this improves things

Isn't that above the maximum pressure rating of the tire? It is on my 235/55/R17CC2s but maybe you have a different size tire?

 

[stationmaster]

Isn't that above the maximum pressure rating of the tire? It is on my 235/55/R17CC2s but maybe you have a different size tire?

Not sure - I looked, but there appears to be no max. pressure stated on the tyre. They are load rated 103 and speed rated Y. 235/55/17.

I will get a new pressure gauge and reassess the pressures.

 

[Cali Phillip]

Isn't that above the maximum pressure rating of the tire? It is on my 235/55/R17CC2s but maybe you have a different size tire?

The Goodyear vector gen 3 suv are stamped max 3.4bar or 49.3psi.

 

[Cali Phillip]

Agree. Most my driving is small twisty roads. I take it easy of course. But it is a fairly heavy vehicle on 103 rated tyres. A higher rating would be better.

I looked at the 215 109 load option, however not sure gain much in £/mile saving given they are more expensive, small in the total cost of running a Cali.

 

[stationmaster]

I looked at the 215 109 load option, however not sure gain much in £/mile saving given they are more expensive, small in the total cost of running a Cali.

I had the higher load rated Agilis Cross Climate on a previous California. Covered around 10,000 miles before the van was sold, but they seemed to be really good and no signs of wear/uneven wear. Maybe i'll switch to them again soon if they are made in the right fitment/size.

 

[Frank L]

Why would one vary from the tyre pressures listed on the Vehicle door frame sticker? Because of the CC tyres?

 

[chockswahay]

Just a side note, only vaguely related here. We had a Fiat Ducato based campervan a few years ago, Fiat said that all tyres must be inflated to 80 PSI (!). This was truly teeth knocking out territory! I had Continental tyres at the time so I rang Continental and spoke to one of their engineers, she stated that the tyres should be inflated according to axle weight. All I can remember is that this meant reduced pressures somewhere in the region of 48 front and 43 rear (I think, it was 12 years ago).

The result was amazing! the ride comfort increased dramatically! I kept my teeth, and the first set lasted for 36000 miles.

It turned out that the PSI figure on the sticker was a 'coverall' by Fiat to cater for builders and other tradesmen always filling the van to the max (and some!).

If I had not spoken to Continental myself I would have had difficulty believing it. The engineer even sent me a full and detailed email explaining the reasons why the PSI figures were so important. Impressive stuff and well done Continental. In contrast when I rang Michelin they just re quoted the placard figure on the door pillar. Needless to say, I had Continentals fitted again on that particular van.

 

[stationmaster]

Just a side note, only vaguely related here. We had a Fiat Ducato based campervan a few years ago, Fiat said that all tyres must be inflated to 80 PSI (!). This was truly teeth knocking out territory! I had Continental tyres at the time so I rang Continental and spoke to one of their engineers, she stated that the tyres should be inflated according to axle weight. All I can remember is that this meant reduced pressures somewhere in the region of 48 front and 43 rear (I think, it was 12 years ago).

The result was amazing! the ride comfort increased dramatically! I kept my teeth, and the first set lasted for 36000 miles.

It turned out that the PSI figure on the sticker was a 'coverall' by Fiat to cater for builders and other tradesmen always filling the van to the max (and some!).

If I had not spoken to Continental myself I would have had difficulty believing it. The engineer even sent me a full and detailed email explaining the reasons why the PSI figures were so important. Impressive stuff and well done Continental. In contrast when I rang Michelin they just re quoted the placard figure on the door pillar. Needless to say, I had Continentals fitted again on that particular van.

Truly helpful - thanks!

 

[WelshGas]

Why would one vary from the tyre pressures listed on the Vehicle door frame sticker? Because of the CC tyres?

There is no reason if you have the correct sized tyres unless of course the vehicle is overloaded on a regular basis.
Tweaking pressures within the range given for a particular tyre size/wheel size might be required as the sticker only gives min/max pressures depending on a min/max load.

 

[Frank L]

There is no reason if you have the correct sized tyres unless of course the vehicle is overloaded on a regular basis.
Tweaking pressures within the range given for a particular tyre size/wheel size might be required as the sticker only gives min/max pressures depending on a min/max load.

Thanks WG, helpful as ever.
Ties in with chockswahay note explaining Continental's engineer advice regarding relationship of tyre pressure to axle load.
I have 255X45XR18 103Y tyres.
I had 4 Michelin Cross Climate 2's fitted in France and the (Euromaster) outlet (without asking) set them at 45psi all round. We were traveling fully loaded (and with bikes on a tail gate rack) . This is in line with the full load "door sticker" figures. I only noticed the pressures when I came home, where I use the Cali as a daily driver.
The lower load condition on the door frame for my 255s is 44F 39R, which is what I normally use, so I reset to those.