VEVOR 4 Pack 5Inch Scaffolding Rubber Swivel Caster Wheels with Dual Locking Heavy Duty Casters 1.26 Inch Square Stem 440LBS Capacity per Wheel

These don't fit 1” tubular construction scaffolding.

The pin is to hold/lock the wheel while the rack lifting(not rolling). Think it is not designed to hold weight

The pin does not serve as support to scafolding, it is to prevent the wheels from falling out of position if lifted or on unlevel ground it could dislodge its self.

The product information does not mention if the wheels are replaceable. However, it states that the wheels are made of high-quality rubber for superior shock absorption and wear resistance.

According to the product description, it has a double locking mechanism that simultaneously locks both the wheel and the swivel for added security.

According to the product description, the casters are made of solid rubber wheels which offer superior shock absorption and wear resistance.