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Tiny
KGETZ
  • MEMBER
  • 2013 DODGE CARAVAN
  • 2WD
  • 56,400 MILES
My front tires are marked 100 on the load index. Can I use 102 marked on the back? I am still tire shopping.
Sunday, April 8th, 2018 AT 9:15 AM

28 Replies

Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
A 100 load index is good to 1,764 pounds per tire.
The 102 load index up to 1,874 pounds per tire.
So yes, the 102 would be more than the front.
I found that your vehicle weighs 4,306 lbs, so they should be okay.
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Sunday, April 8th, 2018 AT 9:32 AM
Tiny
KGETZ
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I just want to make sure it is okay to mix index sizes on my van.
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Sunday, April 8th, 2018 AT 9:35 AM
Tiny
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Yes, it should be okay.
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Sunday, April 8th, 2018 AT 10:05 AM
Tiny
WRENCHTECH
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  • 20,761 POSTS
I would say no, it is not okay to mix tire sizes on that vehicle. The load index is determined by the size of the tire so you are trying to mix sizes. You car has ABS brakes and having different size tires will mess up that system and your differential.
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Sunday, April 8th, 2018 AT 3:31 PM
Tiny
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He was talking about the load index, not tire size!
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Sunday, April 8th, 2018 AT 4:47 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
I am aware of that. Different load index means a different tire size.
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Sunday, April 8th, 2018 AT 4:51 PM
Tiny
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I did not know that. I suppose you are correct.
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Sunday, April 8th, 2018 AT 5:03 PM
Tiny
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There are exceptions but as a rule the load index and tire size go together. The exceptions are optional extra load tires and sometimes speed rated tires that are only made in limited sizes. He really needs to tell us the sizes to confirm.
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Sunday, April 8th, 2018 AT 5:22 PM
Tiny
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I agree!
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Sunday, April 8th, 2018 AT 5:28 PM
Tiny
KGETZ
  • MEMBER
  • 88 POSTS
225 /65 /R17.
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Sunday, April 8th, 2018 AT 5:44 PM
Tiny
WRENCHTECH
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Are both choices that size?
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Sunday, April 8th, 2018 AT 5:46 PM
Tiny
KGETZ
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  • 88 POSTS
Yes.
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Sunday, April 8th, 2018 AT 6:17 PM
Tiny
KGETZ
  • MEMBER
  • 88 POSTS
Do all the tires have to have the same speed rating? I am a speed limit driver, and the fastest I will drive is seventy mph on the PA Turnpike.
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Sunday, April 8th, 2018 AT 6:19 PM
Tiny
WRENCHTECH
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Okay, it will not be an issue as long as you are replacing all four. You would not want to mix them as they might perform differently.
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Sunday, April 8th, 2018 AT 6:19 PM
Tiny
WRENCHTECH
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Speed ratings effect a lot more than speed limit. The construction of the tire is entirely different so you need to stay with at least the recommended speed rating and do not mix them.
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Sunday, April 8th, 2018 AT 6:22 PM
Tiny
KGETZ
  • MEMBER
  • 88 POSTS
I had to replace the front two a couple of weeks ago, but I just need the backs, and I am having trouble finding 225 /65 /R17 100 Index S rated.
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Sunday, April 8th, 2018 AT 6:34 PM
Tiny
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It is not ideal but you can get away with two and two.
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Sunday, April 8th, 2018 AT 6:37 PM
Tiny
KGETZ
  • MEMBER
  • 88 POSTS
I checked the front ones that are new and they are marked 106H. Never heard of 106 and I cannot find a retailer with 106's.
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Sunday, April 8th, 2018 AT 6:42 PM
Tiny
WRENCHTECH
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Now you are getting confusing.
You started out asking about 100 and 102, then you had 100 on the front. Where is the 106 coming from?
What size and speed rating did the truck come with?
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Sunday, April 8th, 2018 AT 6:47 PM
Tiny
KGETZ
  • MEMBER
  • 88 POSTS
The ones that were on the van when I got it from my parents were 225 /65 /R17 102H. The new ones say 106H. The new ones are Nokian Entyre 2.0 model. I thought the fronts were 100S, but I was mistaken.
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Sunday, April 8th, 2018 AT 6:51 PM

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