Tyre pressures W204 c63 19s

[Skd884]

Im waiting on skd884 to see what he's running as he's mentioned 40 psi is too much for daily use

Oem c63 Bs.

255 front/285 rear

 

[Spider10]

So you say 40psi is too high ?

 

[Skd884]

33/33 for normal speeds as per my post above for my car.

 

[Spider10]

Nice car BTW, 33 seems abit low looking at the guide but each to his own

 

[Skd884]

Nice car BTW, 33 seems abit low looking at the guide but each to his own

Thanks that is what is stated on the flap so..........

 

[DRBC43AMG]

I stick to what is recommended on the petrol filler panel

 

[Neiltodd]

Thanks that is what is stated on the flap so..........

You must be running 18" then.

 

[davymead]

As per filler cap I run 39/39.

 

[Spider10]

You must be running 18" then.

Not on a black series never?

 

[Steve84N]

You can't fit 18" wheels on a BS because of the 390mm brakes. Just a different pressure spec for a different car.

 

[Bobby Dazzler]

@Bobby Dazzler see the post above with the different pressures for summer tyres on 18" or 19" wheels. Both will be XL tyres and both will have a similar (high) speed rating.

In all brands of car I've ever seen you use lower tyre pressures for higher profile tyres. Therefore, I cannot agree with you.

We don’t all have to agree. Forums prosper based upon a balance of agreement and disagreement.

The higher tyre pressures are not because of the lower profile lower sidewalls, it’s because of the load rating.

If two tyres have the same load rating but are different sizes, then the tyre pressure will be the same.

 

[Jobsworth]

We don’t all have to agree. Forums prosper based upon a balance of agreement and disagreement.

The higher tyre pressures are not because of the lower profile lower sidewalls, it’s because of the load rating.

If two tyres have the same load rating but are different sizes, then the tyre pressure will be the same.

Whilst this is technically accurate, I think they specify a higher pressure with the very low profile tyres in an attempt to keep the rim from hitting the road with the lovely surfaces we are expected to drive on. It’s not a comprehensive answer either, judging by the number of C63 19” rims I’ve sold in the last few years.

 

[Steve84N]

You can find tyres with a load rating of 91 and 95 in both the 18" and 19" tyre sizes, yet on the pressure chart there is no mention of load rating... The pressures are specified by tyre size and if load rating was the defining factor then why is it not stated?

There is clearly a correlation between tyre profile and load rating but Mercedes are not using load rating to define the pressures to be used. The important factor is air volume and given that the width is the same on 18" or 19" tyres the volume is less with 19" wheels as a result of the lower profile.

 

[Skd884]

You must be running 18" then.

Oem 19s.

 

[Neiltodd]

Oem 19s.

Then according to the plate on the fuel cap you are much lower than recommended. For my interest do you find that better? When I ran them lower I seemed to get a lot more tyre wear. Perhaps I should try them lower again.

 

[Skd884]

Then according to the plate on the fuel cap you are much lower than recommended. For my interest do you find that better? When I ran them lower I seemed to get a lot more tyre wear. Perhaps I should try them lower again.

Mine is a BS, 33/33 is as stated on flap

See my posts above.

 

[ftogpx]

Mine is a BS, 33/33 is as stated on flap

See my posts above.

That is interesting... So the BS has much lower tyre pressure recommendations for 19s and the same tyre sizes. Could it be because the alloys are forged? But I don't see why that would matter. I may try lowering mine from 38/40 and see if it improves the suppleness at all.

 

[Skd884]

That is interesting... So the BS has much lower tyre pressure recommendations for 19s and the same tyre sizes. Could it be because the alloys are forged? But I don't see why that would matter. I may try lowering mine from 38/40 and see if it improves the suppleness at all.

My tyres are 255 front and 285 rear.