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Old 10-25-2010, 09:01 AM   #1
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19 inch wheels?

I know there's a lot of discussion on whether to put 19 inch wheels on the 986. Though I have 18s now, I'm actually considering 19s becaue I want the Miro wheels and they seem to only come in 19s. My question is whether it is necessary to lower the car when I put 19s on it ( I know wheel spacers will probably be necessary). Does anyone out there have 19s on a 986 with stock suspensions? What is your take on this? Does it make the car look extra tall? How does the riding feel?

Thanks for your input!
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Old 10-25-2010, 09:17 AM   #2
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The primary cushion between your car & the road is the sidewall of your tire. Measure the sidewall of your 18" & the 19" to see what you will be missing. I can't advise on 19" fitment because you couldn't give me a set of 19" to put on my car, it is so much more fun to drive with 17" than 18"
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Old 10-25-2010, 10:50 AM   #3
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I don't k about stock height but Click my profile pic. I have 19s. I think the over all diameter is a tiny bit smaller and will give the car a odd look not lowered.
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Old 10-25-2010, 11:15 AM   #4
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Quote:
Originally Posted by BYprodriver
The primary cushion between your car & the road is the sidewall of your tire. Measure the sidewall of your 18" & the 19" to see what you will be missing. I can't advise on 19" fitment because you couldn't give me a set of 19" to put on my car, it is so much more fun to drive with 17" than 18"
I will echo BYP's comments. I have driven both sizes on the same car and no question its a way better driving experience on the 17's.
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Old 10-25-2010, 11:32 AM   #5
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Assuming you're going from stock 18s to 19s with the same width and 30 series sidewalls, your sidewall height in the rear will go from 3.65 inches to 3.13 inches, a decrease of 11.8%.

http://www.ajdesigner.com/fl_tire/tire.php
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Old 10-25-2010, 12:14 PM   #6
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Thanks everyone for your input. And yes, I currently have stock carrera 18s on mine (2003 S). The car is a lot of fun and nimble. I'm going to put 17s next week for the winter. However, I will probably buy another set of wheels come spring time Not sure if 19s will do. Will probably stick with 18s (I just think what I have now is kinda boring - the new turbo style rims are probably my first choice right now).
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Old 10-25-2010, 12:54 PM   #7
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265/35/18
Original tire
Sidewall: 3.65 in
Radius: 12.65 in
Diameter: 25.30 in
Circumf: 79.49 in
Revs/mile: 797.06

275/30/19
New Tire
Sidewall: 3.25 in
Radius: 12.75 in
Diameter: 25.50 in
Circumf: 80.10 in
Revs/mile: 791.03

225/40/18
Original tire
Sidewall: 3.54 in
Radius: 12.54 in
Diameter: 25.09 in
Circumf: 78.81 in
Revs/mile: 803.94

235/35/19
New Tire
Sidewall: 3.24 in
Radius: 12.74 in
Diameter: 25.48 in
Circumf: 80.04 in
Revs/mile: 791.64




Based on these specs, if any boxster owner can discern a significant difference in ride quality based on this slight reduction in actual tire sidewall, then that person should be working for NASA . For anyone who can appreciate the dramatic improvement in handling and overall performance that I experienced by eliminating nearly 100 lbs. of unsprung rotational mass from my vehicle, then I'll buy you an ice cream.
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Last edited by Johnny Danger; 10-25-2010 at 01:03 PM.
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Old 10-25-2010, 12:57 PM   #8
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Quote:
Originally Posted by Pat
Assuming you're going from stock 18s to 19s with the same width and 30 series sidewalls, your sidewall height in the rear will go from 3.65 inches to 3.13 inches, a decrease of 11.8%.

http://www.ajdesigner.com/fl_tire/tire.php
Your data is confusing. What size tires are you actually comparing ?
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Last edited by Johnny Danger; 10-25-2010 at 01:00 PM.
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Old 10-25-2010, 01:03 PM   #9
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lol, that's not my data. That's the default data for the website. I kept things as close to stock with the 19s I used as an example. That's why the figures I posted on this site are so close to yours. The difference is I didn't change the section width.
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Old 10-25-2010, 01:12 PM   #10
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Originally Posted by Pat
lol, that's not my data. That's the default data for the website. I kept things as close to stock with the 19s I used as an example. That's why the figures I posted on this site are so close to yours. The difference is I didn't change the section width.

LoL, I thought so ! You must be comparing 265's then.
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Old 10-26-2010, 11:25 AM   #11
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Those are good numbers that Johnny Danger posted. Your sidewall height should be all that troubles you. Once you get under the 3" you start losing coushioning and even if that doesn't bother you it can wreak havoc on your wheels. Plus it can hurt performance. Your sidewall height can be so low and thus so stiff that your contact patch loses grip on uneven surfaces of real world street driving. It all really comes down to personal preference. Do you want the look or do you want the performance. An 18 is a good compromise of both. But then again thats just my oponion. Didn't some sports car manufacturer go with 19's on their latest models.
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Old 11-03-2010, 08:10 PM   #12
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Hello, i just purchased 19" rims for my 986 and was wondering if i could run 295-30-19 rear & 245/35/19 fronts for tires? or am i gonna have rubbing issues? Thanks.
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Old 11-10-2010, 12:45 AM   #13
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I have 19" on my 986 Front 235/35/19 rear 265/30/19 never had any problems.

Last edited by Erik N; 11-10-2010 at 04:11 AM.
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Old 11-10-2010, 02:19 AM   #14
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Quote:
Originally Posted by oojkoo
Hello, i just purchased 19" rims for my 986 and was wondering if i could run 295-30-19 rear & 245/35/19 fronts for tires? or am i gonna have rubbing issues? Thanks.

Depending on what the offset is of your rear wheels, 295 is an awfully wide tire choice. Both from a clearance perspective as well as a performance one. I've found a very good balance is achieved with the following tire sizes: 235/35/19 and 275/30/19.
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Old 11-10-2010, 07:59 AM   #15
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Erik, did you lower your car? Any suspension adjustments?
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Old 11-11-2010, 07:47 AM   #16
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Hi, No i have standard height. I belive the US spec is a bit higher and softer than EU spec? Mine is imported from US.
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Old 02-02-2015, 06:50 AM   #17
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Originally Posted by Erik N View Post
Hi, No i have standard height. I belive the US spec is a bit higher and softer than EU spec? Mine is imported from US.
Wrong post, please ignore

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Old 02-11-2015, 09:33 PM   #18
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I purchased my 05 s with 19s on it. first thing I did was get a set of 18s from a Carrera and install them. the 18s on 40 series tires versus 19s on 30 series tires really helps the ride quality. driving on the poorly maintained streets of new Orleans, the extra cushion of the slightly higher sidewall is added protection from the not always avoidable potholes. but if you are looking for 19s my stock sizes for the 05 were 235 40 19 fronts and 265 30 19 for the rear. the front offset was 57mm on an 8" wide wheel and the rear was I believe a 55mm offset on a 9.5" wheel. you may try checking various years on tire rack's website for the exact tier sizes and fitment.
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