If you've been riding indoors for any length of time, you've undoubtedly toppled over or tipped your bike out of the trainer. CycleOps solved this dilemma by making a Trainer Skewer specifically designed for its trainers to ensure you're always upright. It fits most rear wheels and is shaped so that it seats securely in the rear wheel mount of the trainer. It is available in one size and in the color silver.