Save your tires for race day. Frequent trainer riders often find the tread on their rear wheel will wear down over time. We recommend using the Saris trainer tires on Sari's indoor trainers. They are made of tough material that can stand up to hours and hours and hours of training. Product Features: 700c x 23c — fits most road bikes. Ultra-quiet and super durable. For trainer use only. Currently only available in yellow.