Pedal Zap and Pedal Crush bicycles sold nation-wide between May 2016 and February 2017.
In some circumstances, the stem may crack and fracture under extreme forces whilst riding.
If the defect occurs whilst the bicycle is in use, serious injury or death can occur.
Consumers should stop using the bicycle immediately and contact their local 99 Bikes retailer to have a new stem fitted.
Contact 99 Bikes on 1300 974 754 or go to www.99bikes.com.au.