Will car pass MOT with different size tyres on

mikey72

Woody. wrote: »

Wider rims don't need a lower profile. It's larger diameter rims that need them.

The profile is a percentage of the tread width, so as you increase the width, the profile/sidewall height increases.
So if you have 285/45/20, if you increase the width to say 315's, you'll need to bring the profile down to 40 to have the same radius on the wheel and tyre.

SailorSam

I failed my last Mot 'cos of different size tyres.
One of the front ones had a split which had got to bad so i put it into the boot and put on the brand new spare, i didn't realise it was a different side. I was annoyed 'cos although i bought the car 3yrs earlier from a Ford dealer the spare hadn't been moved from the boot.
I didn't expect that i'd get a replacement off the dealership but went back to say how annoyed i was that they'd give me the wrong spare.
But apparently that's the way it's done now, the wheel wasn't one of these skinny get-you-home ones and was legal but not good enough to pass an Mot.

Kilty_2

Fiesta by any chance SailorSam?

Saw one with 15" alloys and a 13" steel spare - not a spacesaver but the actual 13" wheel from a base model.

SailorSam

Yes, Peoples the Ford place said that was normal now.
I just saw there was a brand new tyre in the boot but had never checked it.
3yrs down the line when i failed the Mot i just presumed some scumbag had switched them.
Still i got a pass after getting a tyre and now i know the one in the boot is for emergencies only.

Wig

SailorSam wrote: »

I failed my last Mot 'cos of different size tyres.
One of the front ones had a split which had got to bad so i put it into the boot and put on the brand new spare, i didn't realise it was a different side. I was annoyed 'cos although i bought the car 3yrs earlier from a Ford dealer the spare hadn't been moved from the boot.
I didn't expect that i'd get a replacement off the dealership but went back to say how annoyed i was that they'd give me the wrong spare.
But apparently that's the way it's done now, the wheel wasn't one of these skinny get-you-home ones and was legal but not good enough to pass an Mot.

I think they pulled the wool over your eyes.

The only legal time you can use a tyre of a different sze on the same axle is if it is an emergency wheel marked with a yellow 80kph sticker or 50mph. If it was a standard road wheel just the wrong size then it would be illegal on the road. If it had a yellow sticker then fair enough, it was an emergency wheel and you should have known better.

You can use a steel spare as a replacement with 3 other alloy wheels, but the tyre size still has to be the same size.

red_eye

britishboy wrote: »

Got my MOT coming up and have 2 different sizes of tyres on my car, the sidewall measurement (eg 285/45/20), and on the front 285/40/20.
All tyres are practically new, can they fail it with a lower profile tyre on the front wheels?

I think some BMW's have differnt size tyres on??

different size tyres on same axle=FAIL

same size on axle but different size on front and rear will pass

mikey72

One of mine has 225/70/15 on the back, and 195/65/14 on the front, it passes ok.
The spare is a 155/55/15.

Wig

mikey72 wrote: »

One of mine has 225/70/15 on the back, and 195/65/14 on the front, it passes ok.
The spare is a 155/55/15.

Does the spare have a yellow sticker?

mikey72

No.
I have to be honest, it's a kit car, the spare spends most of the time in the garage. It's one of the original wheels and tyres.

anewman

After I bought a car with some receipts for tyres from kwikfit dated around 8 months earlier, noticed two of the tyres were the wrong size. Went to kwikfit and they swapped them, no charge.