Greenspeed 15t Idler with Sidewalls and 10mm Bearing brand_ergon The TRETS even has a

The TRETS even has a medical-aid number (in Germany)

The 5in (125mm) wide T Bar attaches to the other side of the elbow tube

MDS Nylon chainkeepers supported by M5 stainless bolts

5 cubic inches

Small platform pedal with 4-sided entry for superior mud shedding

Greenspeed 15t Idler with Sidewalls and 10mm Bearing brand_ergon The TRETS even has aCombines a 15 tooth sprocket with sidewalls to keep the chain in place on rough roads. Holes must face inward to prevent the idler from coming off the bearing. Non machined teeth and a 10mm inner diameter on the bearing. It has a 72mm overall diameter. Works on 2007 and earlier Greenspeed trikes.