What 19" rims and tire size w/o destroying front diff. - 6SpeedOnline

Mar 3, 2011 | 04:02 AM

YZWILLY

Thread Starter

Registered User

Joined: Oct 2009

Posts: 285

From: PA

Rep Power: 30

What 19" rims and tire size w/o destroying front diff.

I am considering going to a 19" set up for my car and I have read that if I pick the wrong size I can damage the front diff. I am not a math expert so please try to keep it simple. Furthermore looking to run the widest fronts and rears. Thanks guys looks like the new ride will be p/u today via shipper, pics to follow.

Mar 3, 2011 | 04:10 AM

YZWILLY

Thread Starter

Registered User

Joined: Oct 2009

Posts: 285

From: PA

Rep Power: 30

Question answered used the SEARCH button

Looks like everyone says to be safe the largest is235/35/19 and 315/25/19. thanks anyway.

Mar 3, 2011 | 09:10 AM

Mark @ AIM Performance

Basic Sponsor

Joined: Dec 2009

Posts: 6,584

From: S.Plainfield, NJ

Rep Power: 856

I use
19x8.5 with 235/35/19
19x12 with 315/25/19

__________________
#TeamAIM
997TT SilverSpool - 210.8 mph 1/2 Mile WR Apr 2019, 9.2 @ 168 mph 1/4 Mile Manual World Record , 3.15 60-130 mph , 2.72 100-150 mph , 1400whp E85
996TT SpoolBus - 204.6 mph 1/2 Mile 996TT WR Aug 2018, 9.5 @ 154 mph, 3.23 60-130 mph, 2.5 100-150 mph Manual Porsche World Record, 1400whp E85
997TT SlowBerry - 205.0 mph 1/2 Mile WR Nov 2018, 9.7 @ 170 mph 1/4 Mile , 3.2 60-130 mph , 2.4 100-150 mph , 1420whp E85
ESMOTOR | DO88 | TPC DSC | SYVECS | COBB | IPD | KLINE | XONA | AMS | ID | ERP | SACHS | TURBOSMART | CSF | DODSON |

Mar 3, 2011 | 07:58 PM

pumptech

Registered User

Joined: Nov 2010

Posts: 1,030

From: houston

Rep Power: 82

Its got to do with a close matching RPM from front to back. Just saying 305 25 19 doesnt tell much more than its a 19 inch rim and a fat tire.

Mar 4, 2011 | 12:42 AM

dragonman4

Registered User

Joined: Jan 2009

Posts: 642

From: Northern NJ

Rep Power: 67

dragonman4 has a reputation beyond repute

Pretty sure as long as you get tires that are <1% rolling diameter difference you should be fine.

Mar 6, 2011 | 10:12 AM

coastalb55

Registered User

Joined: Mar 2005

Posts: 226

From: Central Coast, CA

Rep Power: 46

I think the most useful specification that many of the tire manufacturers give is revolution per mile. The front and rear should be similar in value.

Mar 6, 2011 | 11:39 AM

Nikolas

Registered User

Joined: Mar 2010

Posts: 1,241

From: Truckee

Rep Power: 82

Tirerack lists the specs of each individual tire they carry. To get you in the ball park this is a good tool to start. Keep in mind though, that there are variations between manufacturers, so always verify.

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