I did that and haven't really noticed any difference. Compared with a GPS speed monitor it's still slightly over reading so all is fine.

 

I have 205-55/16 on my Spider. I did it to help improve the ride, however did not seem to much difference and the minimal difference in tyre rotation only makes the optimistic speedo a little more accurate. This is the maximum size to fit under the front suspension legs, there is just enough clearance.

 

What about MOT? We here can change tyre size with +-3% diameter and equal or better speed/weight tyre codes.

 

I run 205/55/16 tyres and consider that there is no downside whatsoever. I was happy that I had them fitted just over a year ago when I had a tyre wrecked by potholes on a lousy Spanish motorway, I was able to easily find a new tyre at a nearby tyre fitters as 205/55/16 is a common size whilst 205/55/16 is most definitely not, also the 55 profile is cheaper.

http://sensingsys.myzen.co.uk/GTV side view.jpg

An earlier thread on the subject: https://www.alfaowner.com/Forum/alfa-gtv-andamp-916-spider/913250-tyres-again-zzz.html

 

Many thanks one and all.
Will get them done on saturday before the MOT next week. Decision time now. Continental Premium Contact 6 has good reviews and at just under £73 a corner, not a bad price.

 

Managed to bag a set of primacy 4 from costco for £211 fitted though they were a bit funny over the size change and refused to fit, so I asked would they fit to just rims they said yes so I took them off striped tyres off and took rims there and they fitted tyres, bizzare really

 

It's even worse in the USA - even if the same size tyre but not recommended fit for the car, Costco will not fit them to a car.

 

If you have Konis they won't fit. With standard shocks you should be okay.

 

I intend to fit a 215/45/16 on the rear. What you guys think ? [emoji851]

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215/45/16 will be too small in circumference and will not look good on the car.
I have change the original tyres to 225/45R17 on a rim 8" wide.

 

215/45/16 will be too small in circumference and will not look good on the car.

I have change the original tyres to 225/45R17 on a rim 8" wide.

How about 215/55/16 [emoji16].
Would it fit , width wise ?

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Rear only.
Success !
Btw. 225/55/16
[emoji16]

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