Burgtec E-Bike Steel Thick Thin Chainrings MFPN=EFDM3120MBX4 Compression mesh on the lower

Compression mesh on the lower interior panel provides both support and airflow

Hollowtech hollow forged crank arms not only the bike's weight but decreases rotating mass to aid in acceleration

Fully perforated neoprene chassis for breathability

ProTech™ technology joins the two semi axles inside the bottom bracket with a single sturdy screw

Burgtec E-Bike Steel Thick Thin Chainrings MFPN=EFDM3120MBX4 Compression mesh on the lowerExcellent chain retention and mud shedding Designed and manufactured in the UK Model 104mm BCD Inside Fit E Bike Steel, SRAM 94mm BCD E Bike Steel Ring Type Single (Anti Chain Drop) Mount 4x104mm (Inside Fit), 4x104mm (Outside Fit), 4x94mm Teeth 30, 32, 34 Oval Round Round Color Black