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Amazon.com: (2-Pack) Replacement Front or Rear Inner Tubes for 90/65-6.5” and 110/50-6.5” Mini Pocket Bike Tires - Fits Most 38cc, 47cc, and 49cc Mini Pocket Bikes - Compatible with MTA1/MTA2, GP-RSR, and
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Amazon.com: RUTU Heavy Duty 10x2/10x2.125 Tire and Inner Tube - Compatible with Smart Electric Balance Scooter Bike, Bicycle, Tricycle, Stroller Replacement Wheels - For 10-inch Tires with 6-inch Rims : Automotive
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Amazon.com: 1 Set 2.50/2.75-10 Knobby Tire and Inner Tube Set - Replacement Off-road Tire and Tube for Most 49cc, 50cc, and 70cc Dirt Bikes - Highly Compatible with Honda CRF50/XR50, Suzuki DRZ70/JR
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