bmx bicycle frames Kink Williams Frame Swamp Green / 21" supercross rs7 frame10 years ago supercross created the first supercross s7 which was developed to form the ultimate frame in bmx race a model that was ultra light at the time it proved the theory that you can build an aluminum race frame weighing less than 1 kg that will last 10 years later the brand presents the new supercross envy rs7 which uses a special custom blend of alu 7005 ultra light not to mention its heat treatment a quality alloy evolution 1 for each size the seatposts are optimized for the rider s weight and strength evolution 2 new aluminium alloy 7005 triple reinforced tubes this makes the frame stiffer stronger and lighter evolution 3 reinforced head tube although still very light evolution 4 new dropouts with a new optimized shape evolution 5 new cold forged bottom bracket shells with cold rolled threads longer life evolution 6 get it this is a frame rebuilt to the max to guarantee reliability and feel evolution 7 a most notable change especially on pro and larger sizes the bottom bracket shells are now designed to be recessed into the chainstays a super frame weighing 907 grams 1360 grams for 24 wheels geometries frame size junior plus expert expert xl expert xxl pro pro plus pro xl pro xxl pro xxxl pro xl 24 top tube 19 19 5 20 21 20 5 20 75 21 25 21 75 22 25 22 bases 12 5 13 75 14 14 15 15 15 2 15 2 15 2 15 3 steering angle 73 5 74 74 74 5 74 5 74 5 74 5 74 5 74 5 73 5 seat tube angle 70 70 70 70 70 70 70 70 70 70 crankset 10 7 11 2 11 2 11 2 11 6 11 6 11 6 11 6 11 6 11 6 seatpost diameter 22 2 22 2 22 2 22 2 27 2 27 2 27 2 27 2 27 2 27 2 fork 1 threadless 1 threadless 1 threadless 1 threadless 1 1 8 1 5 taper conical 1 1 8 1 5 threadless conical 1 1 8 1 5 threadless conical 1 1 8 1 5 conical 1 1 8 1 5 tapered 1 1 8 1 5 wheel size 20 x 1 1 8 20 x 1 3 8 20 x 1 1 8 20 x 1 1 8 20 x 1 75 20 x 1 75 20 x 1 75 20 x 1 75 20 x 1 75 24 x 1 75 Primus BMX Race Frame at