has any one changed their tyre size on standard saab alloys. I've got a 9-3 on 18" alloys with 225/45/18 tyres. i found that 225/40/18 tyres about £30 cheaper than the 45's and was wondering if anyone had changed to this size tyre and if so was there any problems with the fittment or did they look right or road noise increased etc.
any info would be a help.
thanks.
Full Version: tyre size change
Ride quality will deteriorate a bit going from 45% aspect to 40% because the tyre walls are lower. Check the load rating and speed rating of the cheaper tyres too, if either are lower than Saab recommend then it could be an MOT advisory and potential insurance issue.
Which year 9-3?
The 2003-7 cars can take 225/40 18 tyres but they should be the 92Y extra load rated ones. Standard on the 17 inch wheels was 215/50 17 on the first cars. 225/45 17 94W extra load on the later ones.
Not sure about the newer cars from 2007 some came with 235/45 17 tyres, I believe.
The 2003-7 cars can take 225/40 18 tyres but they should be the 92Y extra load rated ones. Standard on the 17 inch wheels was 215/50 17 on the first cars. 225/45 17 94W extra load on the later ones.
Not sure about the newer cars from 2007 some came with 235/45 17 tyres, I believe.
it's a 2008 9-3. i know i need extra load tyres what ever size goes on. the 225/45/18's are from new and as i mentioned in my question above 225/40/18's are cheaper by any manufacturer of tyre because it is a common size for 18" wheels, thats why i wanted to know if anyone had changed to 40's with out any problem's. thanks for responding to my question anyway.
Not sure that you need extra load tyres in all sizes. Especially if you go for a wider tyre.
Going back to the 17 inch size, Saab fit 225/45 17 94W , and extra load tyre. Standard loading is 91. When they fit 235/45 17 size they fit 94W rating, which is the standard in this size. Extra load is 97 in 235/45 17.
The standard factory upgrade using the Hirsch parts come with 225/40 18 92Y tyres. These are extra load. Standard is 88.
An interesting point to note is that for a short period Hirsch offered 235/40 18 tyres with their kit, but thy went back to 225/40 18.
Extra load tyres seem to be chosen for their wearing qualities rather than the load imposed on them.
Going back to the 17 inch size, Saab fit 225/45 17 94W , and extra load tyre. Standard loading is 91. When they fit 235/45 17 size they fit 94W rating, which is the standard in this size. Extra load is 97 in 235/45 17.
The standard factory upgrade using the Hirsch parts come with 225/40 18 92Y tyres. These are extra load. Standard is 88.
An interesting point to note is that for a short period Hirsch offered 235/40 18 tyres with their kit, but thy went back to 225/40 18.
Extra load tyres seem to be chosen for their wearing qualities rather than the load imposed on them.
Check your handbook or contact Saab for what size tyres can be fitted. In most cases the rim can take a number of different sizes and as ling as you fit within those parameters it will be of no issue to your insurance companty nor is it a MOT advisory. Too much talk about insurance ussires with regard to tyres and MOT advisories or failures is nothing more than scarmongering.
All that is requred is that you fit tyres that fall within the parameters of the rim set by manufacutres and that the same size tyres are fitted accros the same axle.
Hope this helps
All that is requred is that you fit tyres that fall within the parameters of the rim set by manufacutres and that the same size tyres are fitted accros the same axle.
Hope this helps
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