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Old 03-02-2019, 08:37 PM   #1
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19 " tire size recommendations

I'm going to buy some new tires for my new wheels. When I replaced my 18" tires I went with the same sized tires that came on my car. The problem I have with the 19s is 03 Boxsters didn't come with 19s. I dont like the way the tires that came on these wheels look. I believe they are undersized. They look too thin for these rims.
Supposedly these wheels are like what came on a 911 but the guy I bought them from can't be believed. They are 8" wide on front and 10 on the rear I think. Anyone running this type wheel that could give me an opinion on tire size. Here's a pic of the tire on there now.
Thanks in advance.


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Last edited by JBauer; 03-02-2019 at 08:40 PM.
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Old 03-02-2019, 09:17 PM   #2
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Lots of variables. What width and offset are the rims? If you go “too big” then you will likely have a clearance issue. My fenders are rolled and I’ve got good clearance. It might take some (expensive) experimenting. I like the look of some 19’s but not all. They definitely are a bit more harsh, ride wise and tire pressures are key.
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Old 03-02-2019, 09:32 PM   #3
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Ya that's why I was asking so it wouldn't get expensive. Someone out there id running wheels this size.
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Old 03-03-2019, 05:44 AM   #4
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Let's start with some baselines:

You said they're 8" frt & 10" rear.

What sized tires came with the rims?

What are the offsets? They hopefully are listed by the air nipple.

Are you using any spacers?
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Old 03-03-2019, 05:52 AM   #5
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Quote:
Originally Posted by husker boxster View Post
Let's start with some baselines:

You said they're 8" frt & 10" rear.

What sized tires came with the rims?

What are the offsets? They hopefully are listed by the air nipple.

Are you using any spacers?
Yes 8" and 10" I think
235/35/19 front. 265/30/19 rear
Dont know the offset.
No spacers
Thank you

Last edited by JBauer; 03-03-2019 at 07:30 AM.
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Old 03-03-2019, 06:12 AM   #6
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The offsets should be stamped somewhere on the back of the rim hub or spokes. An online tire calculator can help determine what will fit without modding the car.

Just an observation that the rim lip seems very thick as seen from the pics. IMHO this is contributing to the tire sidewall appearing to stand in from the rim. A ‘rim saver’ tire sidewall contour might help to minimize this effect (but it seems that your existing tires already have these sidewall extensions).

Best luck, I always enjoy seeing your projects. Your car always looks great!
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Old 03-03-2019, 06:36 AM   #7
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Thanks. They do seem to have a thick edge. I may have to go to a tire store and buy them. I normally buy online but the tire selector doesn't work when you're working with a size thats not stock �

The way my 18s fit:

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Old 03-03-2019, 09:30 AM   #8
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Quote:
Originally Posted by JBauer View Post
Yes 8" and 10" I think
235/35/19 front. 265/30/19 rear
Dont know the offset.
No spacers
Thank you
Std Porsche 987 19" wheels & tires are:
235/35/19 on 8" wheel front, 57mm offset
265/35/19 on 9.5" wheel rear, 46mm offset

The 30 series tires on the rear are probably to fill the extra 1/2" on your aftermkt wheel. If you want a squarer shoulder, you might go with a 30 series in the front and a 285 on the rear. But that's where the offsets will start to impact whether wider tires will cause fitment issues with suspension and fenders. The e-brake cable and aluminum cross brace come into play with 10" rear wheels.

Can I suggest using the new way to insert pics rather than the old? The old way puts ginormous pics into the thread and makes it a pain to read.
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Old 03-03-2019, 10:53 AM   #9
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Thanks for the advise. I really don't know the width of the rear wheels, that's why the question mark after the width. They very well be 9.5" I know they are aftermarket because of being not stamped. I didnt mention it because I didnt think it was relevant. I checked my factory Carreras that came on the car and they are 225/40/18 on the front.
I removed the giant pic.

Still asking if anyone is running 19" aftermarket wheels on their 986 for the tire size that worked for them.
Thanks
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Old 03-03-2019, 03:22 PM   #10
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Sorry, I missed your widths when I first posted. Too much wine! Anyway, I have Wheel Dynamics RPK-038 19's and they have a completely different configuration as they are "deep dish". I run 19x8.5 (et. 45) & 19x10.5 (et. 52) 235/35R19 Front 275/30R19 Rear. As mentioned my fenders are rolled and rubbing is not an issue. You really need to know the width of the rim. Tires can make a difference as Oldcarguy mentioned. Even though the numbers might be the same, various sidewall/tread patterns can work, while others might not. Another "issue" is trying to keep the overall tire diameter close to the original tire height

Last edited by Geof3; 03-03-2019 at 03:27 PM.
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Old 03-03-2019, 03:54 PM   #11
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Quote:
Originally Posted by Geof3 View Post
Sorry, I missed your widths when I first posted. Too much wine! Anyway, I have Wheel Dynamics RPK-038 19's and they have a completely different configuration as they are "deep dish". I run 19x8.5 (et. 45) & 19x10.5 (et. 52) 235/35R19 Front 275/30R19 Rear. As mentioned my fenders are rolled and rubbing is not an issue. You really need to know the width of the rim. Tires can make a difference as Oldcarguy mentioned. Even though the numbers might be the same, various sidewall/tread patterns can work, while others might not. Another "issue" is trying to keep the overall tire diameter close to the original tire height
Thanks for the input. I'm going to do some more research before I buy any. I may just have to go with the size I have but they look stretched to me.
Thanks
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Old 03-05-2019, 06:31 AM   #12
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Maybe we could start with the tires on the front. I removed one of the front wheels. They are 19x8.5 with a 57 offset. Anyone running a like wheel?



Last edited by JBauer; 03-05-2019 at 06:44 AM.
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