Michelin Ultra Heavy Duty 4mm Front Inner Tube – 21 Inch | Premium Off-Road Puncture Defense

Eradicate race-ruining pinch flats and puncture failures. The Michelin UHD (Ultra Heavy-Duty) Inner Tube is an extra-reinforced, professional-grade off-road tube engineered specifically for demanding motocross, enduro, and cross-country racing. Boasting a massive 4.0 mm wall thickness, it is purpose-built to withstand severe tire deflections, low-pressure traction settings, and brutal impacts against sharp rocks, roots, and hard track edges.
Manufactured by a global leader in motorsport tire technology, this tube utilizes a robust natural rubber and butyl compound. Unlike standard budget tubes with weak joints, it features a heavy-duty overlapping splice that is significantly stronger than basic butt seams. This reinforced seam is strategically positioned opposite the valve stem to ensure superior rotational wheel balance at high speed.
🏁 The Ultimate Weston Beach Race Shield: Racing through deep sand or rocky winter terrain places immense pressure on your tires. Running a premium 4mm Michelin UHD tube prevents the tube from pinching against the rim lock when slamming hard ruts, giving you total peace of mind to push your limits on every single lap!
Key Performance Features:
  • Massive 4.0mm Wall Thickness: Extra-thick structural shielding provides maximum mechanical resistance against tube pinches, punctures, and sharp terrain cuts.
  • Overlapping Splice Joint: Advanced seam construction creates an ultra-reliable bond that eliminates structural separation under extreme heat and high torque loads.
  • TR-4 Straight Metal Valve: Premium straight metal-threaded valve stem comes complete with base nuts and a cap, locking securely into your rim hole.
  • Optimized Wheel Balance: Engineered with precision weight distribution relative to the valve placement, reducing high-speed wheel hop on fast straights.
Fitment & Sizes:
This 21-inch front inner tube is designed for off-road competition wheels and fits the following tire sizes:
  • 90/90-21 (Standard Enduro / Cross-Country front tire size)
  • 80/100-21 (Standard Motocross front tire size)
Please note: This product is strictly intended and labeled for off-road racing, motocross, and enduro training. It is not approved for public highway or road use.
Technical Specifications:
  • Brand: Michelin
  • Product Line: UHD (Ultra Heavy-Duty)
  • Manufacturer Part Number: 827203
  • Wall Thickness: 4.0 mm
  • Wheel Size: 21 Inch (Front Wheel Only)
  • Valve Type: TR-4 (Straight Threaded Metal Valve)
  • Stock Source: Genuine UK stock supplied via MD Racing Products (UK Motocross Specialists since 1983)