So my calculations were correct. Not necessary to divide the sidewall difference by half. 0.647 = roughly the 65-series you mentioned.
For a 16" wheel yes, for a 18" wheel no… lol
35 years ago, some new cars came with that size tire, the front tires would squeal while making a right turn @ 10 mph. Each time I road tested a customer’s car I feared being stopped by the police for reckless driving.
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Nevada is correct. Capri would agree since you did not understand his explanation.
Overall diameter minus wheel diameter and there are two sidewalls so one half the difference.
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So that metric tire equates a 50-55 aspect series tire.
Which has no place on a vehicle in the Odyssey’s or Sienna’s class.
60-65 series would be more appropriate.
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So just because YOU don’t want to buy a Sienna with 50 or 55 seies tires means those others that do are wrong and foolish . . . ?
Maybe you should stand outside the Honda dealerships telling people what NOT to buy 
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The weight of a tire tends to increase as a wheel diameter increases; sidewalls are much thicker, and bead diameter is larger.
14" and 15" high profile passenger car tires often have very thin sidewalls. It is very easy to mount 60 and 70 series tires onto the wheel, not so easy with 35 and 40 series tires because of the thick sidewalls. Thin, soft, flexible sidewalls provide poor handling during emergency avoidance maneuvers.
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What I said was is, from an engineering perspective, there is no reason for such wide low profile tires on a family utility vehicle or van like that.
Nothing about who should/ should not buy what.
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I believe you were once again implying YOU knew what’s best and that the great masses don’t
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And Rick’s Caprice is even older than that one in the picture
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For a 737 maybe.
Sounds like an appropriate width for the car size.
What would be the appropriate tire size for a 7 passenger van with a 3500 # towing capacity?
And your engineering degree is from where?? You certainly seem to speak FOR the engineers when discussing these issues while ignoring ACTUAL engineers denying your claims.
Speaking AS an engineer with two degrees and as one that worked on dampers and suspension systems in the automotive industry for 25 years…
Again I will post this…
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Honda offered a choice when we bought our 2019 Odyssey EX-L. We could have 18” wheels with 0.60 aspect ratio (235/60-18) or 19” wheels with 0.55 aspect ratio (235/55-19). That’s less than a 10% difference in sidewall height and seems small to me. IMO the choice was more cosmetic.
And that is the biggest reason I disapprove of this 20 year trend toward 50-40-series profile tires: the biggest motivator behind it is looks.
As I’ve stated before, the only thing I do regarding looks when it comes to my wheels and tires is to clean them.
No, they were not. This is pretty basic calculation that was already explained quite well.
I’m thinking they may have been generous…
The need for additional rubber in the sidewalls has already been pointed out. But what you are completely missing is that in many businesses, the cost of materials is not the primary driver for price of the goods being made. In this case, it takes the same CapEx for molds and equipment, the same amount of labor and the same overhead costs to fabricate a low profile tire as it does a “taller” one. Hence there is no significant cost savings at a finished goods level. Put the conspiracy theories to rest…
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Heyyyy, guess what??!!!
I’m number 400!!!
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