Inside and outside both measure 71.5mm. Processing is good, I didn't find any bad rivets. They are great for standard rims with the same bore as your hub. If you are using a generic aftermarket rim you may need Hubcentic rings. My rims have a bore of 78 mm, so their center is obviously too small. This can cause the rims and tires to feel unbalanced if they are not mounted exactly in the center of the hub. It's not the product's fault at all. I've bought bushings from 78mm to 72mm and haven't had any problems. These rings properly align your rims to the hub and cost less than $20. Again, if you're using a bearing and parts kit with the correct hub bore, you don't need them. However, finding a suitable rim in the aftermarket is difficult. Aftermarket rims are designed to fit many different vehicles with the same lug pattern and are typically bored out for the vehicle with the larger hub. These hub rings eliminate many spacer problems. Everything is designed to work perfectly in the middle. If it's not the center, you're going to have problems. Another plus is that I can change the brake pads without removing the rims or lifting the jeep off the ground.
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