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DIY Bifold Door Roller Replacement The bifold roller is the most frequent failure point in internal folding doors. The problem is easily fixable by using a simple DIY solution. Bifold door rollers made of stainless steel resist breaking for long-term use. They are designed to be installed easily with the hardware that is included for easy installation. They also have load bearing and designed for smooth operation. Nylon Wheel Nylon is a Thermoplastic material that has excellent mechanical properties.