Hows it going lads.

Thanks to all of you who acknowledged my plight for 18" alloys.

Had an interesting day with e-mails from the Lexus "should know" people.

I e-mailed both "Lexus Ireland" and "Lexus UK" for information on the availability of those elusive 18" wheels. Here are the replys I got from both of them

Please read and let me know your thoughts.

Matty

Lexus Ireland:

Hi Matt,

Unfortunately 18" rims are not available as an accessory on the entry level IS 250. However they are available on the Sport grade which is specifically set up to accommodate them. The reason for this is that changing the diameter of the wheel by two inches significantly effects the gear ratio, safety system inputs ( such as traction control and VSC) and speed readings.

However, there is an accessory wheel available ( which does effect these systems) for the entry level - a 10 spoke 17" alloy. Your dealer will be able to provide you with prices and availability of these wheels.

If you have any further questions please do not hesitate to ask

Lexus Uk:

Good day to you too, I hope you had a pleasant weekend.

This is what I can update you on at the moment.

If you were to purchase a Base model IS 250(with 16” alloys), you can
purchase 18” alloys and fit them later. I think whoever told you that the
Base model could not accommodate 18” alloys, meant they are not part of
the purchase package for the base model IS.

And which ever design you choose they would certainly fit all models,
however please be aware, that a larger wheel would effect your MPG reading.

If I can be of any further assistance please do not hesitate to contact me.

i say one knows what there talking about, and the other is talking out there bottom
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the one talking sense is the Lexus GB person

Who to believe? 2 diff reasons there

i can assure you the answer from lexus Ireland is bollocks!

even though the wheel is 2 inches bigger in overall diameter the tyre will be lower profile so the rolling radius is similer, manufacturers dont change the cars electronics to suit wheels.................

Well Said Mat

Said it before, and I'll say it again - product knowledge is p155 poor at lexus

If it doesn't affect rolling radius and therefore MPH, would it still affect MPG?

well in theory yes, so slight that its not worth worrying about