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The Tire Rack's Tire & Wheel Forum
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Old 05-09-2012, 10:15 AM   #1
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quick spacer question

I'm still trying to wrap my head around offsets and how they effect rim concavity.

I plan on pick up these VMRs and want to get the most concave rim on the back as possible.

I was deciding between et35 and et45 with 10mm spacer. which would be the more concave of the two?
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Old 05-09-2012, 11:17 AM   #2
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The lower the ET, the more the rims sticks out.

The higher the ET, the more they sink in.

Find out what other people are running. I have an M and am not familiar with your stock offsets or what the lowest advisable ET is for your ride.
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Old 05-09-2012, 12:17 PM   #3
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et45 with 10mm spacers is effectively an et35. et35 with 10mm spacers would be the same as an et25.

Another way to think about it is that 0 (Zero) Offset means the hub mounting surface is dead-center along the centerline of the wheel; IE: on an 8" wide wheel the mounting surface is 4" from both the inside and outside edges of the wheel. An offset in a positive direction moves the mounting surface towards the outside of the wheel, effectively pulling the wheel in towards the body. So an et45 rim has a mounting surface 45mm from centerline towards the outside of the rim. If you add a 10mm spacer you're now moving that mounting surface 10mm back towards the centerline - creating an et35 setup.

I'd suggest you take measurements from your current wheel/tires along with clearance measurements, and compare with the new set you're considering. Here is good calculator: http://www.1010tires.com/WheelOffsetCalculator.asp
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Old 05-14-2012, 06:03 PM   #4
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When it comes to our wheels, the concavity is not based on the offset but instead, it is based off the width of the wheel. So, if you had a V701 18x8.5 ET35 and 18x8.5 ET45 they would have the same amount of concavity. On the other hand, an 18x9.5 wheel would be slightly more concave than and 18x8.5 wheel. If you have any specific questions feel free to contact me!
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