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1990 Eldorado Biarritz
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16 Posts
Discussion Starter #1
Greets to all-

As I have now finished the strut replacement job on my '90 Eldo Biarritz, my attention now turns to getting some new rubber
on the Beauty. While she was up on the rack I snagged a great deal on a sweet set of chrome Caddie 16" wheels, all parameters
match up correctly. Currently on 215/65/R15's....what's driving me crazy is trying to find a definitive answer on the best /
correct size 16" tire. If my information is correct, the '90 & '91 Eldo were essentially identical, and 16" wheels were available as
an option on the '91, so I'm not too concerned about fitment. Anyone else do a similar switch-up?? I have seen numerous online
conversion charts....last one I checked....tire-size-conversion.com...said 255/50/R16 would be "equal" to the 215/65/R15.
This morning I was at the joint where I'll most likely buy the tires...and the counter guy says his chart puts it at 215/60/R16.
Hoping someone has first hand experience on this or can help! Drivin' me crazy!!

Buck
 

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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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26,323 Posts
The idea is to end up with tires of the same outside diameter as the originals, or within ~1/4".

Get onto tirerack.com, type in your original tire size, click on specs on one of the results, and note the OD. Then do the same for the two sizes you're considering. See which is closer.
 

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Registered
1990 Eldorado Biarritz
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16 Posts
Discussion Starter #3
Hey thanks MC....never used the "specs" section on TireRack before. Brings up a whole chart of optional sizes. Looks like the guy at the tire shop was correct, the 215/65/R15 has 26" OD, the 215/60/R16 is at 26.1". Didn't have a listing for 255/50/R16. Very much appreciate the tip!!

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HUH! I went back and double checked....and 255/50/R16 is ALSO 26.1" OD....exactly the same. But would these not be a much "lower profile" tire...and have some effect on ride height and "feel"? Would think they might give a rougher ride...am I wrong?
 

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1990 Eldorado Biarritz
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16 Posts
Discussion Starter #5
Mmmm....255's seem to be a "racing" or "muscle car" tire....we'll go with the 215/60/R16....thanks again for the tip.
 

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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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26,323 Posts
Didn't even notice the sizes listed. Yeah, 255's are WAY too big. You want 215 or 225.
 

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1990 Eldorado Biarritz
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16 Posts
Discussion Starter #7
Will do! The original wire spokes just look kind of "stodgy" to me....rims I bought were from a '99 DeVille, I believe, nice chrome 32 fin with a silver powder coat surface down in the outer rim holes. Still gives it sort of a "spoke" appearance but nicer size wheel and beaucoup chrome to accent the trim.
 

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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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26,323 Posts
Just took a quick look.

215/60's are .1" larger than stock.
225/55's are .2" smaller.

Either will work. I'd probably go with the 215/60's.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,273 Posts
Will do! The original wire spokes just look kind of "stodgy" to me....rims I bought were from a '99 DeVille, I believe, nice chrome 32 fin with a silver powder coat surface down in the outer rim holes. Still gives it sort of a "spoke" appearance but nicer size wheel and beaucoup chrome to accent the trim.
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the original tire size was
205/70/15 - 26.30" diameter -

215/65/16 = 27.0" diameter = .7" difference -

I would use 225/60/16 -
26.63" diameter - difference of .33" -
closer to the original diameter -
and a MUCH more common size -
which means more choices - and better prices -
 

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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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26,323 Posts
I was going off of the size listed in post #1. Oh well, disregard the sizes I listed.
 
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