The Serfas 700c x 35/50 Schrader Valve Inner Tubes an affordable option that's lightweight and durable for a variety of rides. Whether you are road or mountain bike riding, these inner tubes will get the job done. Get on your favorite terrains and enjoy the support of the Serfas 700c x 35/50 Schrader Valve Inner Tubes! | Serfas 700 x 35/50 Schrader Valve Inner Tubes