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Old 01-07-2016, 04:21 PM   #1
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tire size-sidewall for comfort and balance

thinking to get a set of 15 inch for my 2015 focus, I really like the 17 inch currently on but cant stand the potholes, especially when driving into the city

So, before I go on searching for takeoffs or buying a set on tire rack etc

my understanding is the higher the sidewall the more of a cushion you get, the middle number tire specs say 65 (from 195/65/15) is the rate for the sidewall compared to the tire's width so 65%x195=126.75 mm sidewall height?

that means for my current 17 inch, I have 215/50/17 so 50%x215=107.5 mm sidewall

going with 15'' would then provide for about 20mm extra sidewall, this should plenty for comfort?

Steelies vs Alloys: apparently steelies weight more but at 15 shouldn't be much of a concern.

Are steelies easier to balance? and are they stronger/less prone to damage from potholes?

Regarding tires, I assume some are better than others and easier to balance/ hold their balance (need good tire brand?)

If I end up getting a new set but without TPMS sensors, does anyone know if the TPMS light also beeps or is just an annoying light?

thanks!


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Old 01-07-2016, 04:53 PM   #2
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Ok, I think you found the right person to ask. I had 16 inch oem with 225/55/ 16 Pirelli p7 all season plus and those were smooth and quiet on my 2014 se. Then I put these on last week
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Old 01-07-2016, 04:58 PM   #3
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Those were 245/ 50/16 and were rough n loud. Handling was amazing though. Every car I've had I've went smaller wheel higher sidewall till I did the 245.
Today discount tire let me return those and I did what you want to do. 205/65/15 Michelin premier a/s. Super smooth, silent and low rolling resistance.
A high sidewall grand touring tire will always give the best ride unless you are lookin to carve corners at 70 mph.
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Old 01-07-2016, 06:23 PM   #4
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Quote:
Originally Posted by mco30mco View Post
Those were 245/ 50/16 and were rough n loud. Handling was amazing though. Every car I've had I've went smaller wheel higher sidewall till I did the 245.
Today discount tire let me return those and I did what you want to do. 205/65/15 Michelin premier a/s. Super smooth, silent and low rolling resistance.
A high sidewall grand touring tire will always give the best ride unless you are lookin to carve corners at 70 mph.
I like these and yeah no more corner carving for me, I just need a smooooth glide like ride!
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Old 01-07-2016, 06:40 PM   #5
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Buy a quality tire, personally I would go with something from Michelin. If you are still running the OEM tires, chances are that will give you what you are looking for without having to downsize to a smaller wheel.
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Old 01-09-2016, 11:19 AM   #6
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You can buy the best quality tire in any low profile size and it will not come near the comfort smoothness and quietness of a higher sidewall smaller rim combination. I've had them all over the years and I know better. The tires are less expensive in 15 and 16 inch and provide exponentially better comfort with better mpg and less wear on suspension components too since the tires are providing cushioning before its transmitted to the suspension and body.
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Old 01-09-2016, 11:39 AM   #7
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Go with 205/65R-15 same overall height as your 215/50R-17
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Old 01-09-2016, 11:40 AM   #8
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That's the size I put on:+1:
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Old 01-09-2016, 07:15 PM   #9
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Quote:
Originally Posted by mco30mco View Post
You can buy the best quality tire in any low profile size and it will not come near the comfort smoothness and quietness of a higher sidewall smaller rim combination. I've had them all over the years and I know better. The tires are less expensive in 15 and 16 inch and provide exponentially better comfort with better mpg and less wear on suspension components too since the tires are providing cushioning before its transmitted to the suspension and body.
Very true. Tires are integral to the suspension and the sidewall can protect suspension components from damage or premature wear.
I remember my wifes 06 BMW X3 with 235/55 conventional (non runflat) tires was nice and smooth through 90k miles, when she traded it for a sedan -which had 225/45- BMW had started using only run flats, well those were bent very quickly, every little imperfection on the road would transmit to the wheels/rest of suspension

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