Adharaz (correct tyres)???

[smiddyboy1]

Hi,
Just got myself some new Mercedes Adharaz wheels (17"). I'm curious to know what the correct tyre sizes are for them.

They currently have 225 x 45 x 17 on the front and 245 x 45 x 17 on the rear -
Am I right in thinking that the back axle should be 245 x 40 x 17. Like these ones on eBay?
http://cgi.ebay.co.uk/Mercedes-C-Class-CLK-SLK-17-Adharaz-Alloys-Tyres_W0QQitemZ270147039070QQihZ017QQcategoryZ9888QQrdZ1QQssPageNameZWD1VQQcmdZViewItem

Another thing I’ve noticed is the cruise control, when I set it to say 70 mph its fine but if I accelerate past it, let off the gas and the cruise control switches off. I know that when I had the old wheels on I set the cruise control, I could speed up to overtake and let off the gas and the car would then sit at 70 mph as was set before.
Could this be related to changing the wheels or just coincidental, I had noticed a little more road noise and bumping which I was expecting.... but not too much seeing as I only went up from 16" to 17".

Thanks

 

[tzar]

tyre size

hi
17"front 225/45 rear245/40 on 180coupe

 

[Bobby Dazzler]

They currently have 225 x 45 x 17 on the front and 245 x 45 x 17 on the rear -
Am I right in thinking that the back axle should be 245 x 40[/FONT] x 17.

You're right, should be 40s in the rear.

I reckon the cruise control thing is a coinkydink.

 

[Dieselman]

The cruise is as a result of the tyres having a different rolling radius. Fit the correct tyres.