Tire Duro 24" x 2.125" Blue/Blue Side Wall HF-133. Duro Brand HF-133 Heavy Duty 30-35 PSI. Tire Duro 24" x 2.125" Blue/Blue Side Wall HF-133. Duro Brand HF-133 Heavy Duty 30-35 PSI. Please note that our tires do not work on schwinn wheels. We carry over 3,000 bicycle parts and accessories. If you have any questions about any of our parts, please send us an email.