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Old 11-14-2013, 04:21 AM   #1
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Will 18" wheels eliminate wheel gap?

I have a a stupid question lol. I'm thinking about getting 18x8 wheels and currently running 17x7 with 21545R17 tires. I'm thinking about going with 23540R18 tires for the 18x8 wheels. Would the diameter change? Would I have less wheel gap or would it be the same as my current set up? I was wondering because on very rare occasions if I hit a bad dip my front rubs and was curious if the 18x8 wheels would be worse in that situation or the same.

Thanks, alex


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Old 11-14-2013, 09:20 AM   #2
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Use a tire calculator like this:
http://www.miata.net/garage/tirecalc.html


Those would be pretty close to the same diameter, wheel gap will not change. Where is your front rubbing now and how bad? Might not be a bad idea to figure that out and possible roll your fenders some, if needed then.
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Old 11-14-2013, 10:38 AM   #3
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Here is a Focus ST with stock 18" wheels
The tires are within a couple of 1/10" of being the same diameter as the stock 16" or stock 17" tire/wheel combo. The tires sre sized to keep the outside diameter the same. The tires yiu are running are smaller in diameter than the stock 17"ers that came on the Focus. The stock tire is a 215/50-17.

The 225/50-17" winter tires I am running on my ST actually fill the wheel wells more than the 235/40-18s that came with the car. So if you want to fill the wheels more you need a larger diameter tire regard less of the wheel diameter.
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Old 11-14-2013, 10:51 AM   #4
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Quote:
Originally Posted by Dgc333 View Post
Here is a Focus ST with stock 18" wheels
The tires are within a couple of 1/10" of being the same diameter as the stock 16" or stock 17" tire/wheel combo. The tires sre sized to keep the outside diameter the same. The tires yiu are running are smaller in diameter than the stock 17"ers that came on the Focus. The stock tire is a 215/50-17.
He drives a 2010, his tires are sized correctly for 1st and 2nd gen Focus.
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Old 11-14-2013, 01:32 PM   #5
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Quote:
Originally Posted by rambleon84 View Post
Use a tire calculator like this:
http://www.miata.net/garage/tirecalc.html


Those would be pretty close to the same diameter, wheel gap will not change. Where is your front rubbing now and how bad? Might not be a bad idea to figure that out and possible roll your fenders some, if needed then.
Thanks guys, I'm pretty sure because of my Sportlines being soft, I'm rubbing on the liner when hitting a bad dip on the interstate. I can see where the tires skimmed the liner. I used the calculator that you provided, and compared the size of my stock tire to the tire sizes I'm thinking about getting for the 18x8 wheels. Like you said there wasn't much change in the sidewall or diameter. It was only either .1 or .2in difference. If that's the case I should be fine. I do want to upgrade to coilovers or a fixed platform and maybe roll the fenders a bit.
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Old 11-14-2013, 02:27 PM   #6
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Not only will it nit get rid of gap it will lift the car up a bit more.



I have 18s on my mk1 I've lowered the car so it has no wheel gap but it had more ground clearance than if I was running a smaller wheel.



With 18s I can lean my cell phone against the front lip, on my winter 15s I can just about lean my key fob against it.
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Old 11-14-2013, 06:09 PM   #7
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Yeah that's one reason why I'm looking at the 18s I want to be low and eliminate wheel gap but still have some clearance. Plus I just want a set Of 18s and 17s to switch off during summer and winter. Kind of a bad time since it's the start of winter to get new wheels because my 18s will have summer tires and already have all season tires on my current set up lol. The winters where I live barely get a inch of snow but do get ice every now and then.
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