Before attaching classic wheels to the stroller chassis, please check the following: Turn the chassis up-side down and inspect the wheel adapter housing for the front wheels. If a thin, white plate attached with two screws are present, remove it on both sides, left and right. Use a screwdriver TX20 and un-screw the screws. Take out the plate and recycle it as plastic. Re-insert the two screws after removing the plate and tighten firmly.
Trailz terrain Serial Numbers with the attached plate:
Trailz Black from serial number: 124AA66744
Trailz Grey from serial number: 124AA64677