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Old 01-09-2017, 05:13 PM   #1 (permalink)
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Default So is my complaint valid or am I just being anal?

So I finally broke down to get dedicated winter tires for my 04 XL7 RWD, by the place that normally sells them at "Discount".

When I took them home I noticed the ride height noticeably higher, so I thought ok, deeper thread, I get it. But when I got out and looked at them in my garage, I noticed they were 235/65/16's. As most of you know the standard for this generation Suzuki is 235/60/16, slightly smaller diameter.

So I went back and complained and requested that I get the tire size that's spec'd for my vehicle, and printed out their website that 235/65's are not even spec'd for this vehicle but the guy who sold me the tires said there's some "leeway" in the specs, but I told nicely if I get into an accident because I was sold the wrong tire size, they would be liable. I know radius can affect speedometer reading but don't know if the difference between 60 and 65 would be significant, but either way, I wanted the tire spec'd for my vehicle.

They ended up swapping the original larger Champiro Ice Pro's with properly sized Bridgestone Blizzaks so I don't know if I got an upgrade in the process, the Champiro's were nice an supple with bite, just looked way too big on my vehicle, almost gave it an off-road or ATV look, even seemed unsafe and 0.5-1.0 inch higher profile with the deeper tread coupled with the larger radius, than the normal profile with properly sized tires. I would have liked the Champiro's in the proper size but supposedly Blizzak's were an upgrade, though lower profile and tread didn't seem as deep as the Champiro's. So hopefully the properly-sized Blizzaks will do.
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Old 01-09-2017, 05:22 PM   #2 (permalink)
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Valid! IMO.
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Old 01-09-2017, 08:29 PM   #3 (permalink)
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Just cause they "fit" don't mean they're right. To maintain the (approx) same diameter you could fudge it with 225/65/16 tires - then you would get a little better bite in the snow (a bit narrower) without throwing off your speedo much.

The larger tires are ok if you are looking for a little lift or a more aggressive appearance, but they will throw your speedometer off a touch. And they may, or may not, affect gas mileage - the balance between lower rpms for your speed verses the higher rolling resistance of a larger tire.

Safety wise its a wash as well. But I think it's best to stick with the spec tire size.
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Old 01-09-2017, 11:33 PM   #4 (permalink)
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Quote:
Originally Posted by Max View Post
Valid! IMO.
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Old 01-09-2017, 11:38 PM   #5 (permalink)
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Just cause they "fit" don't mean they're right. To maintain the (approx) same diameter you could fudge it with 225/65/16 tires - then you would get a little better bite in the snow (a bit narrower) without throwing off your speedo much.

The larger tires are ok if you are looking for a little lift or a more aggressive appearance, but they will throw your speedometer off a touch. And they may, or may not, affect gas mileage - the balance between lower rpms for your speed verses the higher rolling resistance of a larger tire.

Safety wise its a wash as well. But I think it's best to stick with the spec tire size.
The point of higher rolling resistance you brought up is interesting since it may make the tire stick to the ground more, but the higher profile of the tires didn't make me feel comfortable. It may have been a wash as you said, but I agree, it's best to stick with the spec because 235/65/16 wasn't even listed as an acceptable spec for my 04 XL7 on their website for a 65 radius for Plus Zero sizes, only 215/65/16 and 225/65/16 as you said.
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Old 01-10-2017, 08:28 AM   #6 (permalink)
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Quote:
Originally Posted by ngrome View Post
...even seemed unsafe....
This is the one item I'd be concerned about. I've got 235-70-16s on a lifted '04 (one of our two) and only minor rubbing at full lock. That said, with everything else it is a bit more skittish on the road (my technical term) but more capable/clearance for off-roading. If you asked for stock sizes, they should've given you stock sized tires or let you know up front they would recommend something else. That said, after ten+ years driving in midwest & New England winters and being sold on having wholly separate winter tires (not "all-season"), I think you'll be very happy with the Blizzaks.
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Old 01-10-2017, 09:07 AM   #7 (permalink)
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That said, with everything else it is a bit more skittish on the road (my technical term) but more capable/clearance for off-roading.
How much of a lift do you have and what's the probability that the "skittishness" is as a direct result of the alignment issues created by the lift - one area that no-one seems to consider after lifting/larger tires is scrub radius, which I've found can have a direct impact on steering feel.
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Old 01-10-2017, 10:58 AM   #8 (permalink)
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Try this link to verify size/width by yourself:

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

From quick look, the % diff's a bit high @ 3.4%... Ideally for winter tires, you try keeping the same height but thinner footprint, for ex: 215/65R16

Makes for more efficiency in snowy/slushy conditions where thread surface is more limited and has more weight on it...
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Old 01-10-2017, 11:13 AM   #9 (permalink)
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Originally Posted by DynoPax View Post
Ideally for winter tires, you try keeping the same height but thinner footprint, for ex: 215/65R16

Makes for more efficiency in snowy/slushy conditions where thread surface is more limited and has more weight on it...
Agreed. The narrower footprint might not feel as solid on dry surfaces, but will provide more bite in snow. Remember the old VW Beetles with the skinny C Series tires (and an iron motor sitting on top of them). The ad at the time was "What the snow plow driver drives to the snowplow."
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Old 01-10-2017, 03:11 PM   #10 (permalink)
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Quote:
it is a bit more skittish on the road
Airing considerably above the Zuk spec of 26PSI can cause that as well.
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