Is it wise to have different tyre sizes on front and rear even if the alloys are...

[Unparalleled]

of the same size?

I currently have a c180 (w204) and I'm about to order some 19x8.5" alloys. My question is it wise to have say, 225/35/19 Front and 255/30/19 Rear tyre sizes on the alloys or should I just stick to the same size for both front and rear?

thanks.

 

[whitenemesis]

W204!

Stick with what youy have..

That said there is nothing wrong with dif sizes f/r

 

[whitenemesis]

Soz, just re-read your post.

Dif tyre sizes usually go with dif rim widths, not uncommon with MB Sport opnions

 

[Quick Silver]

I had the same size tyres on my C180 (203) now long gone ,it killed the ride quality and made steering at low speeds notchy/snatchy but did improve the road holding .

 

[gibsones135]

Morning. I asked a similar question recently. It might help you:

http://forums.mercedesclub.org.uk/showthread.php?t=47535

 

[television]

Welcome to the forum. 19" will give you a vrey hard ride with a sidewall height of only 76mm

 

[kth286]

Agreed - wonder if F1 cars would have low profiles if it was a good idea.

All show and no go if you ask me.

 

[rf065]

Agreed - wonder if F1 cars would have low profiles if it was a good idea.

All show and no go if you ask me.

They do, just not as low as some car tyres.
You cannot compare a F1 car with road cars, they are built to operate under completely different conditions and adhere to different regulations.

Russ

 

[mikestrivens]

Perhaps they should put lots of pot holes and bad road surfaces on F1 tracks.

 

[Unparalleled]

What I failed to mention is that it's a sports model which comes with slightly larger rear wheels (if I'm not mistaken). I'm still torn between ordering same size all around or slightly larger rears.

 

[Unparalleled]

I had the same size tyres on my C180 (203) now long gone ,it killed the ride quality and made steering at low speeds notchy/snatchy but did improve the road holding .

When you say the same tyre sizes, do you mean the different front and rear examples I gave above?

 

[JEZ.S320L]

Changing tyre sizes MAY even throw cruise control out and make it inoperative

 

[television]

If the rims go 1" bigger then the profile of that tyre goes down 1 size so that the overall diameter stays the same

 

[JEZ.S320L]

If the rims go 1" bigger then the profile of that tyre goes down 1 size so that the overall diameter stays the same

I was thinking more in terms of width, Malcolm.

 

[television]

I was thinking more in terms of width, Malcolm.

it works the same way JEZ

For instance on my car I can use 255 wide tyres all round, the profile then would be 40. If I put on wheels and tyres on the rear say 285 wide, then you drop the profile down to 35, then the rolling diameter stays the same

So with the 255 x 40 tyres I have a sidewall height of 90mm.

285 x 35 will give a height of 97.75 and that is as near as you can get
285

 

[JEZ.S320L]

it works the same way JEZ

For instance on my car I can use 255 wide tyres all round, the profile then would be 40. If I put on wheels and tyres on the rear say 285 wide, then you drop the profile down to 35, then the rolling diameter stays the same

So with the 255 x 40 tyres I have a sidewall height of 90mm.

285 x 35 will give a height of 97.75 and that is as near as you can get
285

That doesn't quite scan with the issue I had when I first got my ML, Malcolm. If you remember, I first posted on here.

My CC wasn't working properly (kept disengaging). Someone asked me to ckeck my tyre sizes. Fronts were 20/40/285 and rear 20/40/295. I changed them all to 20/40/295's and CC worked properly again. No problems since.

 

[television]

That doesn't quite scan with the issue I had when I first got my ML, Malcolm. If you remember, I first posted on here.

My CC wasn't working properly (kept disengaging). Someone asked me to ckeck my tyre sizes. Fronts were 20/40/285 and rear 20/40/295. I changed them all to 20/40/295's and CC worked properly again. No problems since.

The ML could be a border line case, and it should have 295 x 40 or 45 all round. The 4 wheel drive couls be critical on your ML.

The difference back and front was it did not like

 

[LYNALL]

Both mine and the wifes cars have the staggered wheel set up with different size tyres front and rear.



Lynall