Then usable tread depth is compared to remaining tread depth in order to calculate tread wear percentages. For example, a tire that started with 10/32 of original tread depth and has worn off 4/32 (down to 6/32 of remaining tread depth) is 50% worn.
1 If you know the census tract number: Use the IRS list of 2014 Qualified Census Tracts by county. 2  If you have a street address: Visit HUD's interactive QCT Map and enter the property address to view what Census Tract the property is located.
Tribal census tracts may be completely different from the census tracts and block groups defined by state and county (see  Tribal Census Tract ). Census Tract Codes and Numbers Census tracts are identified by an up to four-digit integer number and may have an optional two-digit suffix; for example 1457.02 or 23.