Up to eight rates, one octet each.
The element behind every "disable low rates" recommendation. Each octet's top bit marks the rate as BASIC — mandatory to join — and the rest give the rate in half-megabit units. Removing 1 and 2 Mb/s from the basic set is what keeps 802.11b stations off a network, and it is visible right here.
Supported Rates
Authored in Supported Rates element . Drawn in 5 frames.