15x6.5 38 offset vs 15x7 40 offset
03-23-2008, 12:23 PM
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15x6.5 38 offset vs 15x7 40 offset
hi guys;
as title stated, i'm not sure which one of these set of wheels to purchase for track wheels.
15x6.5 38 offset is also slightly lighter compare to 15x7 40 offset.
my only concern is the offset, will that 38offset make my 205 tires hitting the fenders during fast turns?
car is a 92 civic, tires are falken azenis rt-615 205/50-15
thanks!
as title stated, i'm not sure which one of these set of wheels to purchase for track wheels.
15x6.5 38 offset is also slightly lighter compare to 15x7 40 offset.
my only concern is the offset, will that 38offset make my 205 tires hitting the fenders during fast turns?
car is a 92 civic, tires are falken azenis rt-615 205/50-15
thanks!
03-29-2008, 07:53 AM
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Re: 15x6.5 38 offset vs 15x7 40 offset (yoorang)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by yoorang »</TD></TR><TR><TD CLASS="quote">can you teach me how to calculate this? thanks</TD></TR></TABLE>
15x7 wheels are .5 inch wider than 15x6.5 wheels. .5 inch = 12.7 mm. If the offset is exactly the same, that makes each face of the wheel stick out by 6.35 mm.
Positive offset, like most of the wheels on our front wheel drive cars, measures the vertical distance between the wheel's center line and the mounting surface of the hubs on the car; the lower the number, the more they stick out, and the higher the number, the more they get pushed in towards the car. Changing the offset from +38 to +40 means that the outer face gets pushed in by 2 mm and the inner face also gets pushed in by 2 mm.
Adding/subtracting these two numbers, you'll find that the outer face will stick out by an extra (6.35 - 2) = 4.35 mm, and the inner face will stick out (inwards, towards the car) by an extra (6.35 + 2) = 8.35 mm.
Note that these calculations tell you where the outer face of the wheels get positioned. I'm not sure that the change in the width of the wheel makes the tread of the tire more susceptible to rubbing, since the width of the tire doesn't change at all. The change in offset does move the entire tire outward or inward, though, so that part can affect rubbing.
15x7 wheels are .5 inch wider than 15x6.5 wheels. .5 inch = 12.7 mm. If the offset is exactly the same, that makes each face of the wheel stick out by 6.35 mm.
Positive offset, like most of the wheels on our front wheel drive cars, measures the vertical distance between the wheel's center line and the mounting surface of the hubs on the car; the lower the number, the more they stick out, and the higher the number, the more they get pushed in towards the car. Changing the offset from +38 to +40 means that the outer face gets pushed in by 2 mm and the inner face also gets pushed in by 2 mm.
Adding/subtracting these two numbers, you'll find that the outer face will stick out by an extra (6.35 - 2) = 4.35 mm, and the inner face will stick out (inwards, towards the car) by an extra (6.35 + 2) = 8.35 mm.
Note that these calculations tell you where the outer face of the wheels get positioned. I'm not sure that the change in the width of the wheel makes the tread of the tire more susceptible to rubbing, since the width of the tire doesn't change at all. The change in offset does move the entire tire outward or inward, though, so that part can affect rubbing.
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