Adjustable Width Equipped with three aluminum alloy spacers of varying thicknesses, this thru axle adapter lets you quickly adjust the width to fit rear axles of different bikes on a trainer. Durable CNC Machined Construction Made from aluminum alloy and CNC machined for precision, this adapter is built for long term reliability and stable performance during indoor training. Broad Compatibility Designed to be compatible with a wide range of bikes, including mountain and road bikes, and to accommodate common trainer thru axle standards for secure mounting. Easy Installation User friendly design allows quick installation and removal without tools, providing a hassle setup and reliable fit every time. Stable Performance Delivers solid alignment and reduces wobble, ensuring safe and consistent training sessions. Long Term Practicality Durable construction and straightforward maintenance make it suitable for repeated use across multiple bikes and seasons. Use scenarios Switching between bikes on a home trainer: Quickly adapt the adapter to fit different rear axle widths by changing spacers, enabling seamless indoor training with multiple bikes. Seasonal training with mixed bikes: Use across road and mountain bikes without sacrificing stability or safety during intensity sessions. Maintenance and quick storage: Securely fixture the bike on the trainer during cleaning or storage, keeping the rear wheel stable and centered.