Custom Iron Horse Sunday "Ultimate" 2007 L 650B Mullet 29/27,5" Fork: RS Boxxer Ultimate 2020 Rear Shock: RS Vivid R2C Air 2019 Modified front nad rear triangle for 650B wheel, lower BB Height(340mm), bigger wheel base (1255mm) etc. Custom headseat CNC made Cup -2* degree(63* actual) Lower seat tube like in M-size version of sunday. Additional internal cable routing and custom fender for rear shock and many, many other small tricks :) The frame after welding was heat treated(solution treatment and aging)