Re: Depends
It depends on two things:
1. The wall thickness of the rims.
2. Usage.
Most 3 piece wheels are built with rims of .190, .200, or .220 wall thickness. These are fairly strong and rigid and are a conservative approach taken by most rim builders. Wheels built with rims of this thickness will rarely leak and don't require retorquing. Some ultra-lightweight wheels built with rim wall thicknesses of .160 or .125 do require frequent retorquing and resealing. These wheels generally wieght about 2 to 5 lbs less than wheels using the thicker rims.
If a wheel is used on a race track a couple things will contribute to air leaks and the need for retorquing:
Off track excursions - You go off the track and there's a good chance you'll bend a rim or put a big load into it.
Heat - Surprisingly some 3 piece rims come with low temp powder coated centers. The heat generated from repeated high speed braking on a race track can cause this powder coating to degenerate. This opens up a gap under the fastener hardware and, in extreme cases, can cause the rims to separate from the center.
- John