Got a couple of avons in the garage just wondered if they will be ok fitment wise?

Possibly.

They are only 1.5% smaller (5 mm in radius). I used the calculator on this page. http://www.carbibles.com/tyre_bible_pg4.html

If possible stick to the standard 205/45 size.

Edited 7 November, 201015 yr by Jim H

They'll be absolutely fine What's 10mm between friends

They'll be absolutely fine What's 10mm between friends

You can have 5 mm difference tread depths, (7mm vs 2mm), so as mentioned it should be OK.

ive got a couple on the rear at the minute

What about on 7' wide audi alloys?

Would you run them on front or rear or makes no difference?

Check this tyre calculator - they should be fine on a 7" wide rim. On a modern car with ABS I would be fitting the same size tyre front and rear so as not to upset the ABS system. I would also stick to using four winter tyres or four summer tyres, never two of each.

is there any ride difference with these size tyres on compared to 205/45

I did an arbitrary test on my car yesterday. Mate had GPS speed indication on his satnav, on his smart-phone.

My car runs newish (2K miles) 205/45 x 16s, so standard size.

GPS 60 = 64 on the car's speedo. 6 2/3 percent out at 60 on newish tyres! 195/50s or 205/50s would be OK from a rolling radius perspective.

J.