MITAS 70001361 Standard Duty Motorcycle Dirtbike Tubes Inner Tube - 80/100-21 / 90/80-21 / 2.50-21 / 2.75-21 / 3.00-21 / 100/80-21 / 3.25-21 / 80/90-21 / 3.60-21 / 90/90-21 / 90/100-21- 21" - TR-6 - Center Metal Valve

OVERVIEW

Designed for motorcycles, scooters, and mopeds, this Mitas inner tube delivers reliable air retention on 21-inch wheels. Built from a 1.5 mm thick rubber profile, it balances everyday durability with the flexible sidewall contact needed for standard trail and urban riding. Each tube arrives individually sealed in a nitrogen-rich pouch to prevent oxidation and preserve material elasticity before installation.

ENGINEERING & PERFORMANCE

The 1.5 mm wall construction provides controlled tension against the tire casing, reducing pinch-flat vulnerability during normal load ranges while maintaining smooth inflation tracking. The center-mounted metal valve stem features a galvanized finish to resist hub corrosion and withstand rotational torque during wheel service. Dual mounting washers combined with secured metal and rubber valve caps create a sealed system that minimizes slow leaks caused by frame vibration or temperature cycling.

KEY FEATURES

• Standard duty thickness rated at 1.5 mm for everyday motorcycle and scooter applications
  
• Center-mounted metal valve stem aligned for 21-inch wheel valve holes
  
• Galvanized valve stem protects against moisture-induced corrosion at the axle interface
  
• Includes two dedicated washers for precise valve base gasketing and leak prevention
  
• Secured with both metal and rubber valve caps to lock in optimal tire pressure
  
• Individually retailed in nitrogen-rich sealed pouches to guarantee fresh rubber condition
  
• Dimensions cover multiple width ratios for single 21-inch tire sizing requirements
  

TECHNICAL SPECIFICATIONS

• Brand: Mitas
  
• Product Name: Standard Duty Inner Tube
  
• Type: Inner Tube
  
• Material: Rubber
  
• Wall Thickness: 1.5 mm
  
• Valve Style: Center Metal Valve
  
• Compatible Diameter Sizes: 80/100-21, 90/80-21, 2.50-21, 2.75-21, 3.00-21, 100/80-21, 3.25-21, 80/90-21, 3.60-21, 90/90-21, 90/100-21
  

FITMENT

• 21-inch wheel applications matching the following tire specifications: 80/100-21, 90/80-21, 2.50-21, 2.75-21, 3.00-21, 100/80-21, 3.25-21, 80/90-21, 3.60-21, 90/90-21, 90/100-21

WHY RIDERS CHOOSE THIS

Mechanics and riders rely on this Mitas tube because the 1.5 mm wall thickness offers a proven compromise between puncture resilience and the low-pressure conformability required for 21-inch wheels. The galvanized center valve eliminates weak-points where standard stems crack or deform during axle removal, while the dual-washer valve seat distributes clamping force evenly to stop vibration-related seepage. Factory nitrogen flushing keeps the rubber supple and prevents storage degradation, ensuring consistent bead behavior right out of the package. This straightforward replacement maintains secure airflow for dirt-capable motorcycles, scooters, and mopeds without unnecessary cost.