225/45 on a 7J rim?
Discussion
The rule of thumb is the rim needs to be 90% of the tyre width with a +/- 1/2in leeway either side.
225/25.4 = 8.86
8.86 x 0.9 = 7.97
So a 225 should ideally be on an 8in rim but 7.5in or 8.5in would be OK.
Ideally check with the tyre manufacturer, they should list the range of rim sizes that are acceptable.
Up to you if you go outside their recommendations but if it's used on the road then don't forget insurance implications.
225/25.4 = 8.86
8.86 x 0.9 = 7.97
So a 225 should ideally be on an 8in rim but 7.5in or 8.5in would be OK.
Ideally check with the tyre manufacturer, they should list the range of rim sizes that are acceptable.
Up to you if you go outside their recommendations but if it's used on the road then don't forget insurance implications.
My Saab Aero uses 225/45/17 XL tyres on the original 7" wide ALU39 rims and yes, you do get a little sidewall flex under load - more noticeable on the winter tyres. On the plus side it does help reduce harshness from road imperfections. An 8" rim would be better for keeping a straighter sidewall.
Theoretically it's possibly a bit touch/go but the realistic difference in tyre width over a 215 section (of which you'll find plenty on 7" rims)is minimal. While there's a lot of hearsay on the internet I've done close to 200k with 225's on 7" rims across a couple of cars and never once had issue or even viewed it slightly as a problem. As long as the tyres don't rub on your arches etc you'll be just fine. I've actually just fitted a set of 225 winters myself to the Scoob as the standard 215/45 rubber is a bit on the weedy side, and 215 rubber is like rocking horse st. Check the speedo accuracy (negligible on such a small change) and the rubbing, and crack on.
depends on the tyre - many of the manufacturers have tables on their websites with approved rim sizes listed for each tyre size
http://www.toyo.co.uk/tirefinder
lists 7.5 as ideal with 7 - 8.5 being approved for 225/45R17
http://www.toyo.co.uk/tirefinder
lists 7.5 as ideal with 7 - 8.5 being approved for 225/45R17
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