how many teams have used the stadium which hosted the cycling at the 1908 summer olympics – men's 660 yards ?
SELECT DISTINCT COUNT attr_open var_uri attr_close where brack_open dbr_Cycling_at_the_1908_Summer_Olympics_–_Men's_660_yards dbp_venue var_x sep_dot var_x dbo_tenant var_uri sep_dot var_x a dbo_Stadium brack_close