Forcella RockShox ZEB Ultimate Flight Attendant B1 Color:Black Segment Section XS S M Segment Section XS S M L XL Size in mm 340 360 420 460 500 Handlebar Width 720 720 720 720 720 Stem Length 60 60 60 60 60 Crank Length 170 170 170 170 170 Seatpost Length 420 500 420 460 500 A Seat Tube Length 340 360 420 460 500 B Top Tube Length 549 574 606 636 666 C Head Angle (°) 68 68 68 68 68 D Seat Tube Angle (°) 74 74 74 74 74 E Chainstay Length 440 400 450 450 450 F Bottom bracket drop 48 48 60 60 60 G Head Tube Length 120 120 120 140 160 H Fork Length 497 497 515 515 515 I Fork Offset 42 42 51 51 51 J Wheelbase 1079 1104 1155 1187 1220 K Stack 605 605 630 649 667 L Reach 375 400 425 450 475 previously used to keep the needle bearing in place The supplier also lists the Flight Attendant system as wireless and compatible with AXS so check that the size is right for your bike