I believe you have put this argument against 15 inch wheels before,personally i cannot believe any Ins company would refuse cover for this change..unless they were silly OTT 19/20 inch alloys???..Maybe the member would come on here and be kind enough to inform everyone WHY it was refused that would be very informative...but people should consult their insurance company if they have doubts...The original spec of the Prius is either 15" wheels with 195/65/15 tyres or 17" wheels with 215/45/17 tyres, the radius/circumference of the wheel + tyre is virtually the same...now if i had changed from 15" to 17" fitted with costly tyres that would be another story....Why do they fit tyres with a speed rating of 168mph on a vehicle not capable of a 110mph,the lower the profile the worse the ride and the more chance of doing damage if a pothole is hit,just remember that thin piece of rubber is all there is between you and the road..the wider the tyre the lower the braking performance is and the worse they are in snow...i speak from personal experience..plus on top of this they are more than double the cost x 4 of a standard one...This is just my own personal opinion and i think we should return to the original post. :chinese: Logic and insurance companies don't always go hand in hand and you will often find the cheaper ones are less flexible. The 'computer says no' variety. Anything outside standard manufacturers spec, however worthwhile or beneficial the modification is, is a 'no'. Why? Because it's one size fits all when you're at the cheaper end of the market. The same way you're not going to get Primark taking your jeans up or adjusting a newly purchased suit for you like a Savil Row tailor would (extreme example but you get the idea). Some insurers will look at modifications though so you must tell them of ANY modification regardless of if 'you' feel it's an improvement for the better. Never assume it'll be fine. The more open minded insurer will generally be understanding and happy to update their records. Others are not. Better to find out and have them give you 7 days to replace cover than have a claim turned down later. Chrome trim, different wheels, different badges, higher tinted windows, induction kits, different lights, uprated or performance brakes, DRL modifications (even though it may be perceived that it's a safety improvement) all have to be mentioned. It's not for us to argue whether we think it's right or not. They're the ones providing cover and asking "Has the vehicle been modified outside manufacturers original specification?". I'm surprised Toyota Insurance aren't accommodating though. The Mrs has pranged her IQ and they were great and hassle free when dealing with the claim - so far. I'm planning on pimping the ol' Prius up when I get a job again and am thinking lots of chrome trim from the Toyota dealers. It will need declaring to my insurers at the time and I'll be upfront with them and find one who can accommodate my poor taste :)