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Old 12-03-2006, 02:31 PM   #1
janikphoto
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Default tire size question...

ok, this may be a stupid question, but I was wondering...

does anyone know how far off the speedo would be if I used 225/45/17 tires instead of 225/55/17 tires? The 2001 outback came with 16's stock (as you all know), and a tall sidewall. I'm going to plus one the wheels to a 17", and tirerack.com says the correct plus one is a 225/55/17...

Now, I have a line-up on a couple sets of 2004 gold sti wheels/tires. One guy who lives far away will do a set of wheels only for $750. The other guy, who lives only twenty minutes away, will do a set of wheels/tires for $1000. However, the stock sti size is 225/45/17, not 225/55/17. I want things as close as possible, not to mention the extra sidewall height will make for a nicer ride.

What do you think?!?
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Old 12-03-2006, 02:56 PM   #2
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http://www.miata.net/garage/tirecalc.html

Not sure what your stock size is, but this should help. Just by guessing I would say that your speedo will be off by .4% (slow) with the 225/45/17 as opposed to 7.5% (slow) with the 225/55/17 size. I guessed the stock OB size is 205/55/16.

.02

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Old 12-03-2006, 04:14 PM   #3
ivwarrior
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Comparing the 225/55/17 to a 225/45/17. Not sure what your factory size is to compare that to each of the above sizes.

6.6% fast according to the Miata tire calculator.

When your speedo reads 60mph, you'll really on be going 56mph.

BTW, all other things equal, a 45 series tire has a shorter sidewall than a 55.
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Old 12-03-2006, 04:58 PM   #4
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The lifted Legacy's (i.e. Outbacks and Baja) can use the 55 series tires IIRC because they came with taller tires (I think it was 205/60/16) from the factory.
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Old 12-03-2006, 05:44 PM   #5
Dan Cech
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Your stock tire size is 225/60R16, the 225/55R17 will be the same overall diameter, and is the correct size for your car.

With the 225/45R17 the overall diameter is 42mm less. Your speedo would read 6.64% high, so when the speedo read 75mph you would actually be doing 70mph.

Stick with the 225/55R17.
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Old 12-03-2006, 10:56 PM   #6
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Quote:
Originally Posted by Dan Cech View Post
Your stock tire size is 225/60R16, the 225/55R17 will be the same overall diameter, and is the correct size for your car.

With the 225/45R17 the overall diameter is 42mm less. Your speedo would read 6.64% high, so when the speedo read 75mph you would actually be doing 70mph.

Stick with the 225/55R17.
thank you. That's what I was looking for. I don't think the other guys got what I was saying. The outback had a tall stock tire on a 16". That's why the plus one 17" is still a decent size.

It's partially my fault, since I never stated that the 55 series plus one size was the closest size to the stock tire. I knew the 55 was like the stock 60 series, but others did not... I was just asking how much shorter the 45 series was to the 55.

Quote:
Originally Posted by ivwarrior View Post
BTW, all other things equal, a 45 series tire has a shorter sidewall than a 55.
Thanks, but I thought that was obvious.
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Old 12-03-2006, 11:41 PM   #7
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Quote:
Originally Posted by janikphoto View Post
Thanks, but I thought that was obvious.
Obvious to many, but not all. I've had tire dealers tell me the opposite before. Guess I mis-understood you, I thought you were leaning toward the wheel/tire combo, thinking those were taller.
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Old 12-03-2006, 11:59 PM   #8
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on my 02 wagon with 225 40 18 according to my gps I am 1.5 mph off.

Last edited by hybrid gti 2; 12-04-2006 at 12:07 AM.
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Old 12-04-2006, 01:53 AM   #9
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Quote:
Originally Posted by Dan Cech View Post
Your stock tire size is 225/60R16, the 225/55R17 will be the same overall diameter, and is the correct size for your car.

With the 225/45R17 the overall diameter is 42mm less. Your speedo would read 6.64% high, so when the speedo read 75mph you would actually be doing 70mph.

Stick with the 225/55R17.
On a related note, that's the same tire size I put on my family's minivan
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Old 12-04-2006, 09:50 AM   #10
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Quote:
Originally Posted by hybrid gti 2 View Post
on my 02 wagon with 225 40 18 according to my gps I am 1.5 mph off.
Well, the stock diameter leaves room for error too. When I was on stock diameter, I was probably 4% off or so, so when I went up to 65 series tires for winter (from 60) it was on the nuts accurate.
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Old 12-04-2006, 11:41 AM   #11
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Quote:
Originally Posted by hybrid gti 2 View Post
on my 02 wagon with 225 40 18 according to my gps I am 1.5 mph off.
yikes!!! 18's must give you quite a "fun" ride!!! I bet you try to avoid potholes at any cost...

So, I think I'll pick up the set of sti's with the 45's on them. Then I'll just sell the 45's and get 55's like I need/want... The guy says they are pretty new tires, so I should be able to get a couple hundred for them (hopefully)...
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Old 12-04-2006, 03:10 PM   #12
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OK, I got the OK from the wife to get the sti wheels. I'm gonna go pick them up asap. I think I'll brave the 45/17's that are on the wheels right now. Hopefully they won't ride TOO bad compared to those nice cushy 60/16's that came stock on the car.

I also hope that losing a bit of overall diameter won't look silly with the raised outback. I'd hate to have a ton of wheel well showing.
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Old 12-04-2006, 07:33 PM   #13
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Quote:
Originally Posted by janikphoto View Post
I'd hate to have a ton of wheel well showing.
Unfortunately I'd bet that will be exactly the case. There is already quite a bit of gap, and any decrease in overall diameter is going to increase that, obviously. and visually, I think it will appear to increase more than it really did.

Good luck.

Jared
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Old 12-04-2006, 09:04 PM   #14
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The 45's shouldn't be that bad of a ride. Tire selection will be much more important now though, as there is less sidewall flex to leave as an extra measure of protection and bump absorption. So do your research before you decide on what tires to buy.

I <3 suspension travel though, so I wouldn't be in a hurry to change that...
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Old 12-05-2006, 02:54 AM   #15
janikphoto
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Quote:
Originally Posted by rougeben83 View Post
The 45's shouldn't be that bad of a ride. Tire selection will be much more important now though, as there is less sidewall flex to leave as an extra measure of protection and bump absorption. So do your research before you decide on what tires to buy.

I <3 suspension travel though, so I wouldn't be in a hurry to change that...
Oh, there won't be ANY tire selection in the 45 dept. The 45/17's CAME with the wheels, and that's why I have them. When they wear out (or if I find someone who wants to buy the tires now), I will be buying 55/17's. This will get me back to the correct plus one size.

I picked up the wheels tonight and put them on as soon as I got home. The wheels look GREAT, but the tires do look just a bit small for the car. Not too bad though...

I might take pics tuesday...
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Old 12-05-2006, 05:02 AM   #16
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Quote:
Originally Posted by janikphoto View Post
yikes!!! 18's must give you quite a "fun" ride!!! I bet you try to avoid potholes at any cost...

So, I think I'll pick up the set of sti's with the 45's on them. Then I'll just sell the 45's and get 55's like I need/want... The guy says they are pretty new tires, so I should be able to get a couple hundred for them (hopefully)...
Not even nearly that bad. Maybe if I had 35's I might have to worry. Love 18's there awsome. They don't have side wall issues. Height issues and rarely rubbing issues. What's not to like?
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Old 12-05-2006, 10:36 AM   #17
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Not even nearly that bad. Maybe if I had 35's I might have to worry. Love 18's there awsome. They don't have side wall issues. Height issues and rarely rubbing issues. What's not to like?
welli'm guessing the correct size for my outback on 18's would be something like 225/45/18, and I'll tell you... just the three miles I drove to test the new 225/45/17's tells me that I'm gonna miss my cushy 60 series tires. You can feel EVERYTHING!!! I can't imagine driving on a 35 series...

I can't wait to put on the "correct" 225/55/17 tires. I like the idea of better cornering, but also like the soft ride. That's why I thought the 55 series would be the best of both worlds...
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