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My Equinox Sport has the low profile 235/50/18 tires on it.Could I go to a 60 or 65 series tire instead of the 50 to get a softer ride?
 

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Browndogg said:
My Equinox Sport has the low profile 235/50/18 tires on it.Could I go to a 60 or 65 series tire instead of the 50 to get a softer ride?
Yes, but you'll probably have to get smaller diameter wheels, also.
 

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You could, IF you can find an 18 inch w/that profile. You'll also have to have a friendly shop put them on.

In some states/areas/shops they refuse to do this due to 'liability' issues (?).

It will also change your speedometer reading. You may be going faster than the speed-o says.
 

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RIT333 said:
Yes, but you'll probably have to get smaller diameter wheels, also.
Agreed, but only if you wanted to maintain the same wheel demention, in order to keep your speed sensor reading correctly.

If you add larger tires (if even available) make sure they don't rub when the wheels are lock to lock. As well, it will change your speed reading.

A set of 17" rims (With 235-65x17) would maintain the same result, and likely, the cost of 18" tires would be close to the cost of a set of 4 17" tires and used rims. (More common)

Not sure how much it's going to change anything, as the suspension is pretty stiff on the Nox, resulting in most of the stiffness and ride issues. The tires just eliminate a bunch of body roll due to lack-O-sidewall. The overall difference is an 18" or a 17" may not even be that noticable.
 

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225 65 18 should be the same diameter plus or minus 1 or 2 %
 

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darkside said:
225 65 18 should be the same diameter plus or minus 1 or 2 %
A 225/65x18 = 225mm width, x 65% sidewall aspect, plus 18" rim.

225 x .65 = 146.25mm sidewall height.

146.25mm sidewall + 18" rim (457.2mm) + 146.25mm sidewall.

146.25mm + 457.20mm + 146.25mm = Total height of 749.7mm, OR 29.51" tall.

The oem 235/50 = 117.5mm sidewall aspect, giving a total tire/wheel height of 692.2mm, or 27.25" total height.

Total difference is 2.26" all together, which is about a 9% difference.

That being said: Tires can vary by 7% larger or smaller, of the same printed size, based on manufacturer. Check with the specific manufacturer for tire size, based on the MFGer's specs.
 
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