Why don't you guys 245.35.19? - Rennlist - Porsche Discussion Forums

Notices
997 Forum
Sponsored by:
Sponsored by:

Why don't you guys 245.35.19?

 
Old 05-29-2013, 08:07 PM
  #1  
porka
Banned
Thread Starter
 
Join Date: May 2010
Location: San Francisco
Posts: 370
Default Why don't you guys 245.35.19?

i come from a 996 turbo and ran wider tires than stock.. being that the car was awd i had to pair the tires close to overall diameter and rpm's

Based on the super sports for my 997 -

245.35.19 - OD 25.8 / RPM 807 Delta 15

235.35.19 - OD 25.5 / RPM 817 Delta 25

305.30.19 - OD 26.3 / RPM 792

Other than potential for rubbing on really low cars.. get a 245. when i am due for tires i will get this size and report back

Mike
porka is offline  
Old 05-31-2013, 02:22 AM
  #2  
Edgy01
Poseur
Rennlist Member
 
Edgy01's Avatar
 
Join Date: Nov 2005
Location: Santa Barbara, CA
Posts: 17,457
Default

Porsche puts a width differential into their designs for a reason--it has to do with several things. When you up size the fronts you are changing the behavior of the car. Trust me, Porsche did extensive testing with the 245/19 on the 997s but settled with the 235 width--for a number of reasons.
Edgy01 is offline  
Old 05-31-2013, 07:10 AM
  #3  
ilko
Agent Orange
Rennlist Member
 
ilko's Avatar
 
Join Date: Jun 2006
Posts: 15,744
Default

One of those reasons was that the car was set to understeer from the factory. 245 front tires would help in that department.
ilko is offline  
Old 05-31-2013, 10:24 PM
  #4  
Chris from Cali
Super User
 
Chris from Cali's Avatar
 
Join Date: Sep 2006
Location: Colorado
Posts: 3,862
Default

Anyone running 245 fronts? I am planning on moving to 305s from 295s, so I'd consider 245s as well...
Chris from Cali is offline  
Old 05-31-2013, 11:49 PM
  #5  
USMC_DS1
Super User
 
USMC_DS1's Avatar
 
Join Date: Feb 2011
Location: Austin, TX
Posts: 3,022
Default

Would this throw off the ABS system? as programmed from the factory.
USMC_DS1 is offline  
Old 06-01-2013, 12:00 AM
  #6  
Alan C.
Addict
Rennlist Member
 
Alan C.'s Avatar
 
Join Date: Jun 2001
Location: Ohio
Posts: 7,895
Default

I've run 245.35.19's on the front without issue. However, I also put 325.30.19's on the rear to help with the F/R diameter delta
Alan C. is offline  
Old 06-01-2013, 04:10 AM
  #7  
rijowysock
Addict
Rennlist Member
 
rijowysock's Avatar
 
Join Date: Apr 2009
Location: The Arctic Cold
Posts: 5,718
Default

i loved my 245 fronts, running 255 fronts on my aWD 997 now.



235's were way too narrow for me....

if they picked the ****ty conti's because of their "rigorous testing" then i can no longer trust their decisions.. the stock tires were crap, and 235's too narrow.. they need the car to be naturally "understeer" happy for US regulations... therefore... narrower fronts.
rijowysock is offline  
Old 09-16-2013, 06:47 PM
  #8  
porka
Banned
Thread Starter
 
Join Date: May 2010
Location: San Francisco
Posts: 370
Default

i just put the 245's up front.. they certainly hug my 8.5" wheel better... beforehand i had a slight stretch which i know it optimal for handling as the sidewall has less flex. I live in san francisco with bad roads and wanted to protect my rims and has more grip.

they seem to be working out fine, i have noticed that under full lock they do rub slightly..
porka is offline  
Old 09-17-2013, 05:56 PM
  #9  
Jack667
Super User
 
Jack667's Avatar
 
Join Date: Sep 2001
Location: Milton, GA
Posts: 2,063
Default

This sounds cool - I'm going to try and remember this when it's time for me to buy new fronts

I'm running 245s for track tires and probably should do it for the street as well...
Jack667 is offline  
Old 09-17-2013, 06:36 PM
  #10  
997_rich
Addict
Rennlist Member
 
997_rich's Avatar
 
Join Date: Apr 2010
Posts: 904
Default

Running 245 width on a 9" wheel up front, also stepped out a bit so it doesn't run. Running this setup on the track and the street and love it over stock.

Of course, better to run a wider wheel with a 245, probably a 9" instead of the 8.5". If you're running too wide of a tire, the side wall will be floppier than optimal. I think most tire techs refer to this as the "stretch of the tire on the rim). And ideally you want the same stretch in the front as the back.

Here's what I'm running after recos from folks at formula 43, Fikse, and several other folks at the track.

18x 9.0 et51 (with 245/40-18)
18X 11.0 et51 (with 295/35-18 )
997_rich is offline  
Old 09-17-2013, 06:51 PM
  #11  
997_Toronto
User
 
997_Toronto's Avatar
 
Join Date: Aug 2013
Location: Toronto
Posts: 1,400
Default

Was just thinking about it earlier today that I would like to go 245(F) & 295 or 305 (R) and I come home to this topic...coincidence? I think not...perfect timing me thinks

Oh...and 2007 997.1 C2 and moving to 19" OEM wheels next spring.
997_Toronto is offline  
Old 09-17-2013, 07:04 PM
  #12  
porka
Banned
Thread Starter
 
Join Date: May 2010
Location: San Francisco
Posts: 370
Default

i was thinking of going wider in the rears but 325 i think would be pushing it in terms of clearance on a narrow body
porka is offline  
Old 09-17-2013, 07:10 PM
  #13  
slicky rick
Addict
Rennlist Member
 
Join Date: Apr 2010
Posts: 2,151
Default

Thought about this before replacing the tires. Oem ps2's were shot. Wanted to do 245s and 305's vs current 235's and 295's. i now just do more spirited driving no track or autocross. Did not make sense for any change. I might just loose the feel that makes me smile. So i stuck with the tried and tested. But i would tend to agree that the understeeer character of the car is why porsche did 235's. 245's would help for sure. But change in width of tires also affects steering feel and other characters of the car..just take note.
slicky rick is offline  
Old 09-18-2013, 01:06 PM
  #14  
joelpirela
User
 
joelpirela's Avatar
 
Join Date: Jan 2008
Location: Miami, Florida
Posts: 364
Default

I am running 245 fronts and 325 backs. narrow body
joelpirela is offline  
Old 09-18-2013, 01:09 PM
  #15  
porka
Banned
Thread Starter
 
Join Date: May 2010
Location: San Francisco
Posts: 370
Default

Originally Posted by joelpirela View Post
I am running 245 fronts and 325 backs. narrow body
what width rears are you running? 12's?
porka is offline  

Thread Tools
Search this Thread
Quick Reply: Why don't you guys 245.35.19?


Contact Us About Us Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: