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Why are 20" and 21" tires so much more $$$ than 17-18" tires? #5377800 03/16/20 12:33 PM
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grampi Offline OP
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I don't get it. There isn't more rubber on the larger diameter wheel size tires, in fact there's less rubber because they have shorter sidewalls. Is it more costly to manufacture tires with a larger diameter hole in the middle? Makes no sense...

Last edited by grampi; 03/16/20 12:33 PM.
Re: Why are 20" and 21" tires so much more $$$ than 17-18" tires? [Re: grampi] #5377807 03/16/20 12:36 PM
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JustN89 Offline
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Economies of scale.

17-18" tires are much more common and therefore produced in higher quantities than 20-21" tires. As you produce more, the cost per unit gets driven down and then sold at a lower price point.

Re: Why are 20" and 21" tires so much more $$$ than 17-18" tires? [Re: grampi] #5377810 03/16/20 12:38 PM
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edyvw Offline
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Originally Posted by grampi
I don't get it. There isn't more rubber on the larger diameter wheel size tires, in fact there's less rubber because they have shorter sidewalls. Is it more costly to manufacture tires with a larger diameter hole in the middle? Makes no sense...

It is lower profile tire, which means sidewall have to be stronger to deal with same imperfections on the road. Also, those tires are usually higher performance category which means different rubber compound. Granted, more and more appliance vehicles are venturing into that category, and they are definitely cheaper than before, but still lower volume, higher performance and more complex product.


11' BMW 328i xDrive 6MT (Pennzoil Platinum Euro 5W40+ MANN filter)
11' VW Tiguan 2.0T (Castrol 0W30+OE filter)
15' Toyota Sienna AWD (Mobil1 5W30 EP+OEM filter).
Re: Why are 20" and 21" tires so much more $$$ than 17-18" tires? [Re: grampi] #5377812 03/16/20 12:39 PM
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When I buy donuts at Tim Hortons, I pick the ones with the smallest holes.

Re: Why are 20" and 21" tires so much more $$$ than 17-18" tires? [Re: grampi] #5377858 03/16/20 01:28 PM
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Donald Offline
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Originally Posted by grampi
I don't get it. There isn't more rubber on the larger diameter wheel size tires, in fact there's less rubber because they have shorter sidewalls. Is it more costly to manufacture tires with a larger diameter hole in the middle? Makes no sense...


Same reason 17-18" tires are much more expensive that 13-14"


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Why are 20" and 21" tires so much more $$$ than 17-18" tires? [Re: grampi] #5377861 03/16/20 01:31 PM
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97prizm Offline
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Actually even finding 13" tires for my Mazda is becoming difficult. I have a feeling those tire sizes will get more expensive.


If at first you don't succeed fail fail again. (Waldorf and Statler.)
1997 Geo Prizm...DEAD
1984 Mazda RX-7 Spec 7
2005 Dodge Neon
Re: Why are 20" and 21" tires so much more $$$ than 17-18" tires? [Re: 97prizm] #5377863 03/16/20 01:33 PM
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Originally Posted by 97prizm
Actually even finding 13" tires for my Mazda is becoming difficult. I have a feeling those tire sizes will get more expensive.


Boy back in the day I remember getting a set of 155/80/13 tires for under $100. Slightly over $100 after mounting and balancing, but that was a long time ago.

Re: Why are 20" and 21" tires so much more $$$ than 17-18" tires? [Re: JustN89] #5377880 03/16/20 01:59 PM
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Originally Posted by JustN89
Economies of scale.

17-18" tires are much more common and therefore produced in higher quantities than 20-21" tires. As you produce more, the cost per unit gets driven down and then sold at a lower price point.


Can't directly dispute this-but I will mention that many pickups come with 20's and we know how many the big three sell of those things.

Re: Why are 20" and 21" tires so much more $$$ than 17-18" tires? [Re: grampi] #5377886 03/16/20 02:05 PM
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BMWTurboDzl Offline
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Originally Posted by grampi
I don't get it. There isn't more rubber on the larger diameter wheel size tires, in fact there's less rubber because they have shorter sidewalls. Is it more costly to manufacture tires with a larger diameter hole in the middle? Makes no sense...



Why would you think there's less rubber? It's fairly obvious the larger tires require more material just by the weight difference. Demand also impacts cost. Unique tire sizes have limited demand which drives up cost per unit. A unique size can be large or small vs the population.

PS A/S 3+:
245/45R20 - 30 lbs
245/45R18 - 28 lbs


Last edited by BMWTurboDzl; 03/16/20 02:07 PM.

“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

435i
Re: Why are 20" and 21" tires so much more $$$ than 17-18" tires? [Re: BMWTurboDzl] #5377894 03/16/20 02:12 PM
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grampi Offline OP
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Originally Posted by BMWTurboDzl
Originally Posted by grampi
I don't get it. There isn't more rubber on the larger diameter wheel size tires, in fact there's less rubber because they have shorter sidewalls. Is it more costly to manufacture tires with a larger diameter hole in the middle? Makes no sense...



Why would you think there's less rubber? It's fairly obvious the larger tires require more material just by the weight difference. Demand also impacts cost. Unique tire sizes have limited demand which drives up cost per unit. A unique size can be large or small vs the population.

PS A/S 3+:
245/45R20 - 30 lbs
245/45R18 - 28 lbs



I guess the bigger hole in the middle of the tire adds extra weight...
shocked2

Re: Why are 20" and 21" tires so much more $$$ than 17-18" tires? [Re: grampi] #5377915 03/16/20 02:37 PM
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BMWTurboDzl Offline
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Originally Posted by grampi
Originally Posted by BMWTurboDzl
Originally Posted by grampi
I don't get it. There isn't more rubber on the larger diameter wheel size tires, in fact there's less rubber because they have shorter sidewalls. Is it more costly to manufacture tires with a larger diameter hole in the middle? Makes no sense...



Why would you think there's less rubber? It's fairly obvious the larger tires require more material just by the weight difference. Demand also impacts cost. Unique tire sizes have limited demand which drives up cost per unit. A unique size can be large or small vs the population.

PS A/S 3+:
245/45R20 - 30 lbs
245/45R18 - 28 lbs



I guess the bigger hole in the middle of the tire adds extra weight...
shocked2


I also just wanted to apologize for my condescending answer.


“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

435i
Re: Why are 20" and 21" tires so much more $$$ than 17-18" tires? [Re: BMWTurboDzl] #5377916 03/16/20 02:40 PM
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ondarvr Online Content
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Originally Posted by BMWTurboDzl
Originally Posted by grampi
I don't get it. There isn't more rubber on the larger diameter wheel size tires, in fact there's less rubber because they have shorter sidewalls. Is it more costly to manufacture tires with a larger diameter hole in the middle? Makes no sense...



Why would you think there's less rubber? It's fairly obvious the larger tires require more material just by the weight difference. Demand also impacts cost. Unique tire sizes have limited demand which drives up cost per unit. A unique size can be large or small vs the population.

PS A/S 3+:
245/45R20 - 30 lbs
245/45R18 - 28 lbs



You aren’t comparing tires of the same size, the 20” is 2” taller

You need to go to a 245/55 18 to get the same diameter to compare the weight.

Re: Why are 20" and 21" tires so much more $$$ than 17-18" tires? [Re: BMWTurboDzl] #5377917 03/16/20 02:40 PM
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grampi Offline OP
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Originally Posted by BMWTurboDzl

Originally Posted by grampi
Originally Posted by BMWTurboDzl
Originally Posted by grampi
I don't get it. There isn't more rubber on the larger diameter wheel size tires, in fact there's less rubber because they have shorter sidewalls. Is it more costly to manufacture tires with a larger diameter hole in the middle? Makes no sense...



Why would you think there's less rubber? It's fairly obvious the larger tires require more material just by the weight difference. Demand also impacts cost. Unique tire sizes have limited demand which drives up cost per unit. A unique size can be large or small vs the population.

PS A/S 3+:
245/45R20 - 30 lbs
245/45R18 - 28 lbs



I guess the bigger hole in the middle of the tire adds extra weight...
shocked2


I also just wanted to apologize for my condescending answer.

Cheers1

Re: Why are 20" and 21" tires so much more $$$ than 17-18" tires? [Re: grampi] #5377920 03/16/20 02:44 PM
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Quattro Pete Offline
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Originally Posted by grampi
Originally Posted by BMWTurboDzl
Originally Posted by grampi
I don't get it. There isn't more rubber on the larger diameter wheel size tires, in fact there's less rubber because they have shorter sidewalls. Is it more costly to manufacture tires with a larger diameter hole in the middle? Makes no sense...



Why would you think there's less rubber? It's fairly obvious the larger tires require more material just by the weight difference. Demand also impacts cost. Unique tire sizes have limited demand which drives up cost per unit. A unique size can be large or small vs the population.

PS A/S 3+:
245/45R20 - 30 lbs
245/45R18 - 28 lbs



I guess the bigger hole in the middle of the tire adds extra weight...
shocked2

245/45R20 has larger overall diameter and circumference than 245/45R18, so more rubber is needed on the outside.

Now, if we're talking about a tire with the same overall outside diameter, just different inner diameter, then yes, the one with less sidewall should weigh less, unless that shorter sidewall is further reinforced, say like 245/55R18 vs 245/45R20.



2002 530i   2015 Q5 3.0T   2018 Charger SRT
Re: Why are 20" and 21" tires so much more $$$ than 17-18" tires? [Re: Quattro Pete] #5377930 03/16/20 03:04 PM
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grampi Offline OP
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Originally Posted by Quattro Pete
Originally Posted by grampi
Originally Posted by BMWTurboDzl
Originally Posted by grampi
I don't get it. There isn't more rubber on the larger diameter wheel size tires, in fact there's less rubber because they have shorter sidewalls. Is it more costly to manufacture tires with a larger diameter hole in the middle? Makes no sense...



Why would you think there's less rubber? It's fairly obvious the larger tires require more material just by the weight difference. Demand also impacts cost. Unique tire sizes have limited demand which drives up cost per unit. A unique size can be large or small vs the population.

PS A/S 3+:
245/45R20 - 30 lbs
245/45R18 - 28 lbs



I guess the bigger hole in the middle of the tire adds extra weight...
shocked2

245/45R20 has larger overall diameter and circumference than 245/45R18, so more rubber is needed on the outside.



It does, but I was comparing tires that would have the same overall TIRE diameter. For example a 245/65/R18 to a 245/40/R20. In this case there would be less rubber required for the 20" tire vs the 18" tire, while overall tire diameter would be about the same...

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