Originally Posted by aeajr
5/16" OD - Standard HS good for about 1.7M up to about 3M or about 65 ounces.
3/8" OD - HS for up to about 3.5M or about 80 ounces. Fine for 2M planes, just don't pull as far.
1/2" OD - Good for up to about 4M or about 100 ounces. May not be good for 2M planes.
The OD alone doesn't tell you enough. What is fundamentally important is the cross-sectional area of the rubber. That area depends on the OD and the wall thickness. Several summaries of the actual dimensions (OD and wall thickness) of the tubing from many sources have been posted on this forum.