The ztr alpha 340 700c rim from stans no tubes is an exceedingly smooth extraordinarily fast and unquestionably the next step forward in performance the rim represents the first implementation of bead socket technology bst for the road and cyclocross market the short sidewalls and 17mm wide inside rim cavity allow for lower tire pressure while maintaining a firm tire feel with decreased rolling resistance and a more compliant ride quality the low weight and semi aero profile of the alpha