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J Rockin

Has Anyone Changed The Rims On A Is 250?

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I slammed my car into a curb and destroyed 3/4 rims and tires. The insurance company wants to fix the rims and put them back on the car or give me $1300 to get my own rims. I was hoping that someone had picture or suggestions on what size to go with. I was thinking 19 x 8.5 in the front and 19 x 9.5 in the back. I dont know if 20's will sit well on the car. Any suggestions or pictures would be great.

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I can't see 20' would fit. The tire well/bay does not seem to accomodate 20".

How about the car stability?

Any idea about the speed factor when you go from one size wheels to the next size up ? I know that there is a difference.

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I can't see 20' would fit. The tire well/bay does not seem to accomodate 20".

How about the car stability?

Any idea about the speed factor when you go from one size wheels to the next size up ? I know that there is a difference.

Plenty of people have fitted 20" rims (open the link I posted and you'll see plenty on 250/350's), although IMO that's extreme as I have to be careful with my 19" because of the lower profile tire. What do you mean 'speed difference'? There should not be a difference (within the tolerances of what's available) as the bigger rims sizes use a lower profile tire to keep the rolling diameter i.e. the outside diameter of the tyre the same as before...applies whether you have 16", 17", 18", 19" or 20" on the IS250/350. There's only a problem if you fit a much wider tire or use rims with unsuitable offset.

My rolling diameter is slightly smaller than with the 17" rims and tires I had on the car originally, and makes a difference of around -4 mph at 60 mph from the OEM setup, but as this is within the usual +10% the speedometers read anyway it just makes it more accurate. I've verified this with a hand held Satnav over a 5 mile straight line so haven't bothered to recalibrate the Lexus Satnav I have in the car (which apparently is possible). I switch between the 17" rims and 19" for Winter/Summer driving anyway.

The only other difference is a slightly harder ride due to the lower profile tire not having the same amount of shock absorbance as the original tires. There's no other change in the way the car feels as far as stability is concerned.

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I can't see 20' would fit. The tire well/bay does not seem to accomodate 20".

How about the car stability?

Any idea about the speed factor when you go from one size wheels to the next size up ? I know that there is a difference.

Plenty of people have fitted 20" rims (open the link I posted and you'll see plenty on 250/350's), although IMO that's extreme as I have to be careful with my 19" because of the lower profile tire. What do you mean 'speed difference'? There should not be a difference (within the tolerances of what's available) as the bigger rims sizes use a lower profile tire to keep the rolling diameter i.e. the outside diameter of the tyre the same as before...applies whether you have 16", 17", 18", 19" or 20" on the IS250/350. There's only a problem if you fit a much wider tire or use rims with unsuitable offset.

My rolling diameter is slightly smaller than with the 17" rims and tires I had on the car originally, and makes a difference of around -4 mph at 60 mph from the OEM setup, but as this is within the usual +10% the speedometers read anyway it just makes it more accurate. I've verified this with a hand held Satnav over a 5 mile straight line so haven't bothered to recalibrate the Lexus Satnav I have in the car (which apparently is possible). I switch between the 17" rims and 19" for Winter/Summer driving anyway.

The only other difference is a slightly harder ride due to the lower profile tire not having the same amount of shock absorbance as the original tires. There's no other change in the way the car feels as far as stability is concerned.

===

I missunderstood you.

But if use larger tire size the speed would be higher even your speedo shows lower speed and I'm interested in knowing the difference.

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I can't see 20' would fit. The tire well/bay does not seem to accomodate 20".

How about the car stability?

Any idea about the speed factor when you go from one size wheels to the next size up ? I know that there is a difference.

Plenty of people have fitted 20" rims (open the link I posted and you'll see plenty on 250/350's), although IMO that's extreme as I have to be careful with my 19" because of the lower profile tire. What do you mean 'speed difference'? There should not be a difference (within the tolerances of what's available) as the bigger rims sizes use a lower profile tire to keep the rolling diameter i.e. the outside diameter of the tyre the same as before...applies whether you have 16", 17", 18", 19" or 20" on the IS250/350. There's only a problem if you fit a much wider tire or use rims with unsuitable offset.

My rolling diameter is slightly smaller than with the 17" rims and tires I had on the car originally, and makes a difference of around -4 mph at 60 mph from the OEM setup, but as this is within the usual +10% the speedometers read anyway it just makes it more accurate. I've verified this with a hand held Satnav over a 5 mile straight line so haven't bothered to recalibrate the Lexus Satnav I have in the car (which apparently is possible). I switch between the 17" rims and 19" for Winter/Summer driving anyway.

The only other difference is a slightly harder ride due to the lower profile tire not having the same amount of shock absorbance as the original tires. There's no other change in the way the car feels as far as stability is concerned.

===

I missunderstood you.

But if use larger tire size the speed would be higher even your speedo shows lower speed and I'm interested in knowing the difference.

There are various calculators to help you match up profiles to get similar speedo readings.

Here's one:

http://www.net-comber.com/tirecalc.html

http://www.moparregister.com/articles/calc/

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I put 18X8 inch Boss 328s on mine. Sure like the way it looks. I maintained circumference of the original tires too. Not sure how to add a picture yet or I'd show you.

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