Small animals tend to live shorter lives than larger animals. There are a few theories as to why that is, but the one I believe is most popular is: small animals tend to live shorter lives anyway (because of threats from predators), so there are fewer opportunities to evolve to be long-lived.
The American National Standards Institute (ANSI) Class 150 is a system of dimensional standards for weld neck, threaded, slip-on, lap joint, socket weld and blind flanges. Dimensions for facing, bolts and studs are also included in ANSI Class 150. ANSI Class 150 establishes measures for pipe sizes.
Re: How is track width measured? flange to flange, a 78 t/a with 7 wide snowflake rims and a 78 t/a with 8 snowflake rims(with one inch outer lip) both have the same track width.. and the 8 rim is an inch wider on the front face not in backspacing.. so it's def not outer edge of rim(tire) it's flange to flange..