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[Proz]

Your speedo would be well out

http://www.miata.net/garage/tirecalc.html

With 225/40/18 speedo says 60mph actual would be 58.5 ..thats not to bad
With 235/40/18 speedo says 60mph and actual would be 59.2mph 

[waspy]

Your speedo would be well out

http://www.miata.net/garage/tirecalc.html

Most speedometers are out anyway. I trust my satnav more than the speedo

[Proz]

Your speedo would be well out

http://www.miata.net/garage/tirecalc.html

Most speedometers are out anyway. I trust my satnav more than the speedo

Yes so do i .... 

[goonv6]

I have had some experience with this. You are correct that they will only replace with a standard wheel unless you have a modified vehicle policy from someone like Performance direct. If they had to replace two 19" wheels on your car at Vauxhall prices, your car would almost certainly be classed as a write off, if you needed 4 it would unbelievably be a cat c,as you would undoubtable need tyres as well. Having dealt a fair bit with alloy wheels and tyres, I would also advise you that I have yet to get in a set of 19s that haven't in some way had buckles in. BMW rims are bar far and away the worst. If you need your speedo readjusting, then the one and only Speedy cables is the only place to go. www.speedycables.com

[Proz]

I have had some experience with this. You are correct that they will only replace with a standard wheel unless you have a modified vehicle policy from someone like Performance direct. If they had to replace two 19" wheels on your car at Vauxhall prices, your car would almost certainly be classed as a write off, if you needed 4 it would unbelievably be a cat c,as you would undoubtable need tyres as well. Having dealt a fair bit with alloy wheels and tyres, I would also advise you that I have yet to get in a set of 19s that haven't in some way had buckles in. BMW rims are bar far and away the worst. If you need your speedo readjusting, then the one and only Speedy cables is the only place to go. www.speedycables.com

Im leaning towards the 18" ones because i do belive the 19" as you say would be easily bent 

[waspy]

I have had some experience with this. You are correct that they will only replace with a standard wheel unless you have a modified vehicle policy from someone like Performance direct. If they had to replace two 19" wheels on your car at Vauxhall prices, your car would almost certainly be classed as a write off, if you needed 4 it would unbelievably be a cat c,as you would undoubtable need tyres as well. Having dealt a fair bit with alloy wheels and tyres, I would also advise you that I have yet to get in a set of 19s that haven't in some way had buckles in. BMW rims are bar far and away the worst. If you need your speedo readjusting, then the one and only Speedy cables is the only place to go. www.speedycables.com

Im leaning towards the 18" ones because i do belive the 19" as you say would be easily bent 

I run 18's on my DTi. I've had no problems at all, i am very carefull though, i avoid most holes & the like

[kingycos2]

You can run 225/40/19 on the 19" snowflakes to help the protection for the alloy.     

[Proz]

Well i have just had the insurance on the phone and if i put anything other than the standard 16" alloys on they will have to cancel the policy and start a new one because its a modification ..... i suppose thats what i get for being to honest and telling them ... should have just stuck them on  :-/

[unlucky mark mv6]

Well i have just had the insurance on the phone and if i put anything other than the standard 16" alloys on they will have to cancel the policy and start a new one because its a modification ..... i suppose thats what i get for being to honest and telling them ... should have just stuck them on  :-/

As said earlier in the thread proz,dont tell the effers

[Marks DTM Calib]

Your speedo would be well out

http://www.miata.net/garage/tirecalc.html

Most speedometers are out anyway. I trust my satnav more than the speedo

Satnavs always read under due to the way they calculate position based on a grid with you traversing the shortest distance across it (which in reality, you never do) 

[waspy]

Your speedo would be well out

http://www.miata.net/garage/tirecalc.html

Most speedometers are out anyway. I trust my satnav more than the speedo

Satnavs always read under due to the way they calculate position based on a grid with you traversing the shortest distance across it (which in reality, you never do) 

Makes me wonder how they can sometimes fine folk for doing a few miles over when there's nothing to drive to the correct speed by :-/