Rennlist Discussion Forums   classifieds | membership | rennlist | photo album    
sponsors | upload photo | chat    
 
Go Back   Rennlist Discussion Forums > Turbo Technical Discussion Areas > 911 Turbo (930) Forum
Sign in using an external account
Register Forgot Password?
Search

Reply
 
Thread Tools Search this Thread
Old 10-10-2009, 11:36 PM   #1
AsianBond
User
 
AsianBond's Avatar
 
Join Date: Oct 2002
Location: Hong Kong
Posts: 188
Default Difference between 205/55/16 and 225/50/16 front tires

Changing tires on my 86 930.

Was considering increasing front size to 225/50/16 from stock size of 205/55/16.

My biggest concern is would it make front steering heavier? I tend to stay away from larger diameter and tires for porsches to keep that light front end steering feel.

With 225 will it understeer more?

Will stick with 245/45/16 for rear.
To remove this ad, register today or login if you already are registered!

AsianBond is offline   Reply With Quote
Old 10-12-2009, 01:05 PM   #2
Millhaus
User
 
Millhaus's Avatar
 
Join Date: Jul 2004
Location: SE Michigan
Posts: 96
Default

I run the same size tires. The difference iin the tires is so small you won't notice anything.
Millhaus is offline   Reply With Quote
Old 10-12-2009, 01:59 PM   #3
Daley88930
User
 
Daley88930's Avatar
 
Join Date: Jun 2006
Location: FL
Posts: 449
Default

I switched my car back to the original configuration including Fuchs (it had turbo twists) and I felt it was a little quicker etc. but I agree it seems very similar. The biggest challenge in the future is tire availability in the original tire sizes in the 16 inch spec.
Daley88930 is offline   Reply With Quote
Old 10-12-2009, 03:37 PM   #4
Benny771
User
 
Benny771's Avatar
 
Join Date: Aug 2008
Location: Ontario Canada
Posts: 310
Default

Just make sure you keek the same (or close to ) size outside diameter.
Or what you like the looks of.
Here is a site that was helpful for me.

http://www.csgnetwork.com/tireinfo4calc.html
Benny771 is offline   Reply With Quote
Old 10-13-2009, 03:32 AM   #5
AsianBond
User
 
AsianBond's Avatar
 
Join Date: Oct 2002
Location: Hong Kong
Posts: 188
Default

koo. thanks. will most likely go with 225/50/16 in fronts.

indeed, tire selection is very poor now, tirerack only has the fuzion zri which is quite an ugly tire. Already put a set on a 88 911 supersport. Like to consider alternative for 86 930 turbo.

I know there are continentals, michelin pilot sport, toyo and I think hankook. Any recomemndations?
AsianBond is offline   Reply With Quote
Old 10-13-2009, 10:55 AM   #6
Benny771
User
 
Benny771's Avatar
 
Join Date: Aug 2008
Location: Ontario Canada
Posts: 310
Default

I have had nothing but good luck with these tires. And they are super cheap. For 72$ each, try them you will be happy.
http://www.tirerack.com/tires/TireSe...r=16&x=39&y=12
Benny771 is offline   Reply With Quote
Old 10-13-2009, 02:26 PM   #7
pdqcarrera
Addict
Rennlist Member
 
pdqcarrera's Avatar
 
Join Date: Dec 2005
Location: Left Coast
Posts: 305
Default

Quote:
Originally Posted by AsianBond View Post
Changing tires on my 86 930.

Was considering increasing front size to 225/50/16 from stock size of 205/55/16.

My biggest concern is would it make front steering heavier? I tend to stay away from larger diameter and tires for porsches to keep that light front end steering feel.

With 225 will it understeer more?

Will stick with 245/45/16 for rear.

225 puts more rubber on road than 205 and with a lower aspect ratio, both these considerations will give you less understeer. You get better turn in + quicker response to all inputs - including improved braking. I believe you will notice a difference in a parking lot, but not while street driving until you get close to the hard cornering limits (i.e. high speed on/off ramps).

IMHO the skinny & tall 205/55 is a poor compromise but safer from a factory/OEM liability viewpoint since they fear oversteer so much.

Further humble opinion: every 911/930 should have adjustable sway bars installed to fine tune F/R balance.
pdqcarrera is offline   Reply With Quote
Old 10-13-2009, 07:05 PM   #8
57_300SL
User
 
Join Date: Feb 2007
Posts: 32
Default

Benny771,

Could not open link. Which tires are you referring to?

Thanks,

Todd
57_300SL is offline   Reply With Quote
Old 10-13-2009, 10:14 PM   #9
Benny771
User
 
Benny771's Avatar
 
Join Date: Aug 2008
Location: Ontario Canada
Posts: 310
Default

Quote:
Originally Posted by 57_300SL View Post
Benny771,

Could not open link. Which tires are you referring to?

Thanks,

Todd
These.

Sumitomo HTR+ (Ultra High Performance All-Season)

Try this.

http://www.tirerack.com/tires/TireSe...&AID=10398365&
Benny771 is offline   Reply With Quote
Old 10-13-2009, 10:21 PM   #10
Benny771
User
 
Benny771's Avatar
 
Join Date: Aug 2008
Location: Ontario Canada
Posts: 310
Default

Photo's
Buy the way, i have 255 40 17 on the front (falken crap). 315 35 17 rear Sumitomo's

Last edited by Benny771; 03-02-2013 at 08:53 PM.
Benny771 is offline   Reply With Quote
Old 10-13-2009, 11:34 PM   #11
Millhaus
User
 
Millhaus's Avatar
 
Join Date: Jul 2004
Location: SE Michigan
Posts: 96
Default

Your 17's look really good. How wide are those rear rims?
Millhaus is offline   Reply With Quote
Old 10-14-2009, 12:10 AM   #12
mcguff73
User
 
Join Date: May 2009
Posts: 22
Default

I had the larger size on my 930 when I bought it and went back to the factory size when I needed new tires. Frankly, the difference in size in minimal: maybe .5 to .7 inches wider with the same exact diameter. So while it is a little wider it does NOT have a shorter sidwall and probably for this reason not a noticable difference in performance. What I would recommend, is going with a "ultra high performance summer tire" since not many of us drive our cars in winter anyway. I like the Bridgestone Potenza's that I bought for the Porsche but the Sumitomo HTRZ's that I put on my 03 Mach 1 squeel like a pig and seem a little greesy compared to the bridgestones or the BF goodrich KD's that I used to have. Also, the 225/50's look a little too big on the original Fuch's, not a fitment issue, just aesthetics. Use the Tire Rack to compare, thats how I came up with the Bridgestones.
mcguff73 is offline   Reply With Quote
Old 10-14-2009, 07:49 AM   #13
57_300SL
User
 
Join Date: Feb 2007
Posts: 32
Default

The issue does not seem to be the availability of front tires in 205/55/16 or 225/50/16 sizes as there are numerous options, it seems to be the availability of rear 245/45/16's. In a quick search of Tire Rack the only "street" tires shown are Fuzion and Conti's. Any other matched sets currently available (I do not like running different tread patterns /compound front and rear)? Is there a different size option for the rears? What are people currently doing (I want to keep the original Fuchs)? The car is a street only car.

Thanks,

Todd
57_300SL is offline   Reply With Quote
Old 10-14-2009, 12:56 PM   #14
Benny771
User
 
Benny771's Avatar
 
Join Date: Aug 2008
Location: Ontario Canada
Posts: 310
Default

Quote:
Originally Posted by Millhaus View Post
Your 17's look really good. How wide are those rear rims?

9.5 to 10's ?
There was some question when i put the tires on but either size rims will take that tire and still look great. The tire passes the rim by about a 1/4 inch stopping curb rash on my rims.
Benny771 is offline   Reply With Quote
Old 10-17-2009, 12:26 PM   #15
redoktor
New User
 
redoktor's Avatar
 
Join Date: Sep 2003
Location: Ontario
Posts: 1
Default

I've used both 205/55-16 and 225/50-16 on my fuchs and noticed very little difference. I prefer the way the 205 tire looks on the stock rim. The 225's sidewalls bulge out and do not look right. My tire of choice for the street in this ever decreasing rim size is the Toyo T1R.
redoktor is offline   Reply With Quote
Old 10-17-2009, 12:26 PM
Rennlist



Paid Advertisement
Reply

Tags
16, 205, 225, 2255016, 50, 55, big, car, difference, kind, michelin, pilot, sport, tire, tires

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -3. The time now is 10:50 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.1
Copyright ę 1998 - 2007 Rennlist.com

Advertise on Rennlist - Privacy Statement - Terms of Service - Jobs