Welcome to the world of Saab ! Register
Results 1 to 5 of 5
  1. #1
    Frank Wulfers
    Netherlander Wulf's Avatar
    Join Date
    30 Jul 2010
    Location
    NW Michigan, USA
    Posts
    6,863
    Saab(s)
    '05 Saab 9-5 Aero
    Blog Entries
    13

    Tire load index - 91 or 94 XL?

    Saab recommends tires with a load index of 94 XL for my 9-5. The new tires I want to get have a load index of 91.

    The weight of the Saab 9-5 with full fuel tank and other fluids is 3460 - 3780 lbs or 1570 - 1715 kg
    Gross vehicle weight is 4390 - 4710 lbs or 1990 - 2135 kg


    I don't know the exact front/rear weight distribution for the 9-5 but let's be safe and say it is 60/40 front/rear. So the max GVW for the front wheels is 2826 lbs / 2 = 1413 lbs. Wet weight max of the 9-5 comes to 1134 lbs per tire.

    Maximum load for a 91 tire is 1356 lbs. The 94 XL is 1477 lbs.

    I will never have a load of 1000 lbs in my Saab and reach the max GVW. I also used the max weight numbers so actual weights are most likely less. So it seems tires with a load index of 91 should be fine, right? Or shouldn't you mess with this and get the 94? I have had tires with a load index of 91 on a Saab 9-5 wagon before and all seemed fine.

    https://plus.google.com/113579073485167939315
    Motor Gearheads - automobiles, motorcycles, road adventures, general motor forum

  2. #2
    Dave T.
    Super Moderator Dave T's Avatar
    Join Date
    03 Aug 2010
    Location
    Seattle, Washington
    Posts
    966
    Saab(s)
    1999 9-3SE 5 door, (used to have a 2005 9-3 from 2005-2013)
    Blog Entries
    67
    I know of someone with a Saab that said he needs tires with a load index of 97 and the tire shop will not sell him a 94 rated tire.

    I think that part of the rationale for the tire index is to decrease the probability of tire failure. A blow out is inconvenient, sometimes catastrophic. Wheel well damage and even death has happened. If a tire performances exactly to the specification of the load index, then most people will probably be fine with a tire that has a load index of 3 too low. If the tire has low air pressure, it won't support a load as well. In the late 1990's, there were a series of deaths in Ford Explorers from tire problems. That resulted in Ford recommending that tires not be older than six years old. I think Ford also increased the recommended tire pressure.

    The bottom line is that you will probably be fine but a 91 tire would reduce the safety margin to some unknown extent (unknown to me but statisticians probably have an idea).

    Snow tires often have a higher load index. My 9-3 requires a 93 but my snow tires are 97. My summer tires used to be 97 but now I am driving on 94's. I think, but am not certain, that some early 9-3's specified 91 and 9-3 Sport Combis specify 97.

    I pondered the load index question because I bought a spare wheel to use as a full sized spare. A regular tire almost fits in a 9-3. I put a rubber spacer, which came with the car as packing for the springs, in the trunk so the floor rests on that, not the full sized spare. I did consider a narrower tire with about the same diameter but such tire had a reduced load index, possibly 89. At the end, I did not buy an odd sized tire.

  3. #3
    Jeffrey
    Master SaabTech/Moderator Burnsside42's Avatar
    Join Date
    25 Oct 2010
    Location
    South Eastern PA
    Posts
    1,321
    Saab(s)
    - 80' 99 T16 - 86' 9KT - 95' 9K Custom CS - 00' 9-3 Cabrio - 05' 9-3 Sedan - 06' 9-3 Combi -
    I never pay too much attention to it honestly - but I know the XL is a very good thing. It means the tire is a step above the norm.

  4. #4
    Mike
    Moderator Shazam's Avatar
    Join Date
    30 Jul 2010
    Location
    Rochester, New York, USA
    Posts
    1,989
    Saab(s)
    1973 96
    Quote Originally Posted by Burnsside42 View Post
    I never pay too much attention to it honestly - but I know the XL is a very good thing. It means the tire is a step above the norm.
    So what is the difference in a 94 vs a 94XL. Do they both exist?
    Free SaabWorld Stickers
    "Sometimes it is better to travel than it is to arrive." - Robert Pirsig

  5. #5
    Dave T.
    Super Moderator Dave T's Avatar
    Join Date
    03 Aug 2010
    Location
    Seattle, Washington
    Posts
    966
    Saab(s)
    1999 9-3SE 5 door, (used to have a 2005 9-3 from 2005-2013)
    Blog Entries
    67
    Quote Originally Posted by Shazam View Post
    So what is the difference in a 94 vs a 94XL. Do they both exist?
    Yes. A tire like 215/55R16 94H would be a usual tire. If it had a high load index, it could be 97H XL. A 94 XL tire is probably a smaller tire with a 94 load index. That's the practical answer.

    The legalese answer is that it is a standard load tire but you can increase the tire pressure and increase the load slightly to 94.

 

 

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
All times are GMT. The time now is 17:18.
Powered by vBulletin® Version 4.2.2
Copyright © 2014 vBulletin Solutions, Inc. All rights reserved.
SEO by vBSEO ©2011, Crawlability, Inc.
vBulletin Skin By: PurevB.com