Measuring remaining tire tread
 

When measure tire tread with a gauge are you suppose to place the gauge over the tire wear indicator or not? It would make sense if you do because the tire wear indicator tells you when to replace a tire right, then you can take your measurements from that. This article said not to place over tread wear indicator

(step 5)
http://reviews.ebay.com/Measuring-Ti...00000006905135

I agree with the linked guide -- don't place the guage on top of the wearbar.

Placing the guage on the deepest part of the tread will give you the same tread depth as if you measured from wear bar and added 2/32" (the wear bar is 2/32" high).

whats the point of measuring from the deepest part when the wear bar indicates to replace tire?

Because not all tires have the same compound throughout. At certain situations you just have to bite the bullet and replace tires early.. Winter tires is one of them, the last few 1/32th, most winter tires just have all weather compounds.. so you should change them to new ones before you head up the slopes in winter eg.

Consistency. In theory, if everyone does it the same way, everyone knows what the heck it means.

The wearbars may also not be near certain parts of the tread pattern which you might want to measure. In this case, the deepest part of the mold provides a consistent reference point.

You are measuring how much tread you have left.

When you get down to the wear bars, you still have some tread left.

Hence, you do not measure from on top of the wear bars.