AnswerBMX Seatpost Extender 27.2x407mm Blue MFPN=BALL-11B This is now very common

This is now very common on production fat bikes to keep the q-factor slimmer

}Park Tool DT-3 Rotor Truing Gauge

2-piece aluminum crank arms with Ultra-Torque semi-axles in AISI 630 steel for strength and light weight

Longer upright arms to accommodate larger maximum wheel size (29"+) wider maximum hub width (200 mm) and increased clearance for rotor discs and tires

AnswerBMX Seatpost Extender 27.2x407mm Blue MFPN=BALL-11B This is now very commonCNC machined aluminum extension kit Quick release seat clamps and bolts to mount a bottle cage are included Model Extender Diameter 27. 2mm Length 407mm Setback Zero Material Aluminum Color Blue