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

Disc Center Lock Position Rear Rim Material Aluminum Wheel Tire Type Tubeless Ready Freehub Body SRAM XD-R Rim External Width 25mm Rim inner width range 0-21

van and home storage

Box weight: 17 grams (0

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

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