Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Reply
 
LinkBack Thread Tools Display Modes
Old 07-30-2010, 03:06 PM   #1
Registered User
 
Join Date: Jul 2010
Location: St Charles, IL
Posts: 7
Installed 18's car sits high now

I put some Victor Turismo 18 inch rims on my 07 Boxster and now I feel like I am ridding very high. Also would like to lower the car some for better look. Is there any adjustments than can be made? Thanks Marty
mioprimo is offline   Reply With Quote
Old 07-30-2010, 03:58 PM   #2
Opposed to Subie Burble
 
Overdrive's Avatar
 
Join Date: Mar 2007
Location: Central CT
Posts: 1,197
Garage
Did you keep the overall diameter of the wheel and tire consistent with what was there with the original equipment? Having gone up a size you'll end up with tires with shorter sidewalls if you're keeping dimensions consistent.

This has probably been seen/used before by some people, but here's a little item that'll give you an idea of what I mean.

http://www.miata.net/garage/tirecalc.html

Put in your original tires' diemnsions and those of your new tires to see not only visually and numerically the difference but also how much % off your speedometer would be.

I'm just thinking that, if you're feeling physically higher up, as opposed to the car just looking kinda high due to the wheel change, that maybe you might not have gone with the right tire size. If you did go with what's supposed to be on the 18s from the factory, though (235/40-18 Front and 265/40-18 Rear), then the difference should be absolutely minimal (the new size is actually very slightly shorter in height).

I'm also assuming you went from a 17 to an 18, and not the other way around...
__________________
-O/D

1997 Arctic Silver Boxster, 5-spd
IMSR + RMS
Robbins glass window top
Overdrive is offline   Reply With Quote
Old 07-30-2010, 05:26 PM   #3
Registered User
 
Join Date: Jul 2010
Location: St Charles, IL
Posts: 7
Tire size reply

OD, I did go with the factory size 18's up from. 17's. The Victor Equipment tires are made just for Porsche. It's much easier to get into the car now so I know I am riding higher. I can send a picture if you like? M
mioprimo is offline   Reply With Quote
Old 07-30-2010, 06:11 PM   #4
Registered User
 
husker boxster's Avatar
 
Join Date: Sep 2006
Location: Omaha
Posts: 2,163
I notice a difference in ride height when I go from my std 19s down to my 18" snows, so you're probably correct about riding higher when going from 17s to 18s. The 18s you now have should fill out the wheel opening better. Is it that big of a deal? It's not like you put a set of 22s on.
__________________
PCA National HPDE Instructor
2008 Boxster S Limited Edition #005
2007 Cayman S - SOLD on Valentine's Day 2013
2008 Cayman S Sport - Signal Green
husker boxster is offline   Reply With Quote
Old 07-30-2010, 06:49 PM   #5
Registered User
 
Join Date: May 2008
Location: Toronto
Posts: 2,655
It's an optical illusion since the thicker tires on the 17"s hide the wheel gap better than 18"s.
ekam is offline   Reply With Quote
Old 07-30-2010, 06:56 PM   #6
Porscheectomy
 
Join Date: Mar 2006
Location: Seattle Area
Posts: 3,011
Quote:
Originally Posted by husker boxster
I notice a difference in ride height when I go from my std 19s down to my 18" snows, so you're probably correct about riding higher when going from 17s to 18s. The 18s you now have should fill out the wheel opening better. Is it that big of a deal? It's not like you put a set of 22s on.
The rolling diameter should be the same when going to a plus sized wheel/tire. Lower profile tire side walls deflect less at the road at a given air pressure. So if you are doing it right, the larger tires should have a slightly smaller sized diameter. This makes them the same rolling diameter. So the larger profile wheel and tire combo should actually fill in the wheel well less than the smaller wheel.

It's probable that if the car is riding higher, the tires are the wrong size.

Last edited by blue2000s; 08-03-2010 at 06:11 AM.
blue2000s is offline   Reply With Quote
Old 07-30-2010, 07:20 PM   #7
Registered User
 
Join Date: Jul 2010
Location: St Charles, IL
Posts: 7
Here is an IPhone Pic

Looks pretty good I just need to get used to the new ride/feel. Fronts are 235/40's and rears are 265/40's.
mioprimo is offline   Reply With Quote
Old 08-03-2010, 05:54 AM   #8
Opposed to Subie Burble
 
Overdrive's Avatar
 
Join Date: Mar 2007
Location: Central CT
Posts: 1,197
Garage
Yes, it does look pretty good.

Just can't figure out that whole thing of you "feeling" higher, especially on spec tires....
__________________
-O/D

1997 Arctic Silver Boxster, 5-spd
IMSR + RMS
Robbins glass window top
Overdrive is offline   Reply With Quote
Old 08-03-2010, 09:12 AM   #9
Schatten-Baum-Mechaniker
 
Join Date: Mar 2005
Location: Mississippi
Posts: 242
OEM sizes are :
225/40-18 front
265/35-18 rear

The tires you put on are slightly taller.
The fronts are about 1/3 inch taller.
the rears by about 1 inch
__________________
Tommy
2000 Boxster S
1973 914

Last edited by tommy986; 08-03-2010 at 09:24 AM.
tommy986 is offline   Reply With Quote
Old 08-03-2010, 09:27 AM   #10
Registered User
 
Join Date: May 2008
Location: Toronto
Posts: 2,655
Quote:
Originally Posted by tommy986
OEM sizes are :
225/40-18 front
265/35-18 rear

The tires you put on are slightly taller.
The fronts are about 1/3 inch taller.
the rears by about 1 inch
No these are 986 sizes... 987 tires are taller.
ekam is offline   Reply With Quote
Old 08-03-2010, 09:34 AM   #11
Schatten-Baum-Mechaniker
 
Join Date: Mar 2005
Location: Mississippi
Posts: 242
oops. sorry. disregard my post.
__________________
Tommy
2000 Boxster S
1973 914
tommy986 is offline   Reply With Quote
Old 08-03-2010, 09:37 AM   #12
Porscheectomy
 
Join Date: Mar 2006
Location: Seattle Area
Posts: 3,011
I assume the car had 17s originally? What size were they?
blue2000s is offline   Reply With Quote
Old 08-04-2010, 02:23 PM   #13
Registered User
 
Join Date: Nov 2007
Location: Chicago suburbs
Posts: 1,675
All US cars come with an "off road" ride height mandated by the DOT. You would do yourself a favor to install a set of ROW or aftermarket springs to bring the height down. I dropped my '02 986 S by around 1.5" with H&R sport springs running 18s.
__________________
JGM
2002 Boxster S
1973 911 Green FrankenMeanie
PCA DE Instructor circa '95
jmatta is offline   Reply With Quote
Old 08-04-2010, 02:36 PM   #14
Registered User
 
Quickurt's Avatar
 
Join Date: Jul 2007
Location: Coastal Oak Forest
Posts: 1,069
Those are stock size 987 - 18" tires.

Geez, I hope you don't drop a 3/4" socket on your garage floor!!! I've never seen expansion joints like that before!!
__________________
Sold - Black on Sand Beige 2006 S - 48K miles
18x8.5 and 10 OZ Alleggerita HLT Anthracite wheels and anthracite Cayman side grilles - lovingly adjusted Schnell Short Shift
Quickurt is offline   Reply With Quote
Old 08-04-2010, 03:35 PM   #15
Registered User
 
jaykay's Avatar
 
Join Date: Sep 2009
Location: toronto
Posts: 2,276
Quote:
Originally Posted by jmatta
All US cars come with an "off road" ride height mandated by the DOT. You would do yourself a favor to install a set of ROW or aftermarket springs to bring the height down. I dropped my '02 986 S by around 1.5" with H&R sport springs running 18s.
Are you eating tires yet.....or were you able to keep the toe in within spec?
jaykay is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 04:07 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page