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Wheel sizes???


Geeman's Avatar
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11-11-04, 01:46 PM   #1  
Wheel sizes???

Right now I have 195/55/16's and need to get snow tires. The rims I can get for winter will be 14 or 15's. What size tire would I need to get to keep the same diameter so that nothing changes (ie. speedo etc)? Now for summer if I want to go wider, what sizes would be the same, say a 225/50/16, granted if this size would fit without hitting the strut tower?

Your input is appreciated, Thanks.

 
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carguyinva's Avatar
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11-11-04, 01:55 PM   #2  
no one here...

...really advocates deviating from the original wheel and tire combination because of the potential for change in handling characteristics

 
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11-12-04, 03:49 PM   #3  
You can buy your size in a winter tire they range from $103-$125 where I looked real quick.So stay with the stock size as they are available for purchase.

 
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12-04-04, 10:23 AM   #4  
There are other variables to consider when changing wheel sizes etc. such as off-set, width of rim and tire size.
Without knowing what kind of vehicle this is for, its hard to say what will rub or not.
For tire size compatibility, re keeping speedo in synch, check out this....
http://www.miata.net/garage/tirecalc.html
.
For example, on my mx6 which oem was a 6.5" wide, 15" rim 6.5" with an offset of +42mm with 205/55/15 tires. I upgraded to 7.5" x 16" rim, with a +38mm offset using 205/50/16 tires. Speedo in synch and no rubbing problems. The wider rim and smaller offset puts the rim out further to the edge of the wheel well. Looks great and car handles better - but I do not run any snow tires..just all seasons.
Some food for thought!

 
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12-04-04, 03:04 PM   #5  
Posted By: jatco For example, on my mx6 which oem was a 6.5" wide, 15" rim 6.5" with an offset of +42mm with 205/55/15 tires. I upgraded to 7.5" x 16" rim, with a +38mm offset using 205/50/16 tires. Speedo in synch and no rubbing problems. The wider rim and smaller offset puts the rim out further to the edge of the wheel well. Looks great and car handles better - but I do not run any snow tires..just all seasons.
Some food for thought!
That trire change will cause speedo error. The 205/50/16 is a shorter tire. A 215/50/16 would have been a better match.

 
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12-04-04, 03:37 PM   #6  
Actually no! Using that link, going from 205/55/15's to 205/50/16's gives me 8% too slow, 60mph=60.5mph, vs going to 215/50/16's as you say, gives me 2.5% too slow, so 60mph=61.5.

 
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12-04-04, 06:27 PM   #7  
Posted By: jatco Actually no! Using that link, going from 205/55/15's to 205/50/16's gives me 8% too slow, 60mph=60.5mph, vs going to 215/50/16's as you say, gives me 2.5% too slow, so 60mph=61.5.
What the heck are you trying to say. Last I knew 2.5% was less of a change than 8% so the 215/50/16 was closer to the OE height, like I said. I think you need a new calculater for those equations. I'm telling you, the 205/50/16 is shorter than the 215/60/15 and closer to the original size of 205/55/15.

 
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12-04-04, 06:49 PM   #8  
Sorry....so sorry. My calculation, from that link, should read 0.8%percent... Not 8% percent. as that link reflects. At least the link got it right.
I guess we were both missing a decimal point and reading it incorrectly!!

 
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12-05-04, 04:35 PM   #9  
Posted By: jatco Sorry....so sorry. My calculation, from that link, should read 0.8%percent... Not 8% percent. as that link reflects. At least the link got it right.
I guess we were both missing a decimal point and reading it incorrectly!!
Well, I never used the site at first but I have since got their numbers and compared them with manually using the formulas. I found that although that software does a lot of rounding and is off a little, the proportions seem to be in line. I initially spoke strictly from memory and appear to be wrong. You had the right size in the first place.

 
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12-06-04, 07:57 AM   #10  
Well, at least the closest size, anyway!

 
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