Triumph Norton BSA Standard 18-inch X 3.75/4.00/4.25-inch Inner Tube(s) PN# 37-0187 TBS-37-0187

Due to past performance and their high quality we use only BikeMaster inner tubes in our shop. This BikeMaster tube will fit 3.75/4.00/4.25″ x 18″ tires only.

Keep your vintage Triumph, BSA, Norton and other classic British motorcycles safely on the road with this standard 18-inch inner tube, sized for 3.75, 4.00, and 4.25-inch tires and supplied under part numbers 37-0187 and TBS-37-0187. Engineered for reliable performance on tube-type rims, this motorcycle inner tube is a practical replacement for worn or cracked originals commonly found on older British bikes.

Key Features

• Standard 18-inch motorcycle inner tube sized for 3.75, 4.00, and 4.25-inch tires, suitable for many classic British models.
  
• Supplied under PN# 37-0187 and TBS-37-0187 for easy cross-reference with Triumph, Norton, BSA and aftermarket parts catalogs.
  
• Constructed from durable rubber for consistent air retention and long service life when used with properly mounted tube-type tires.
  
• Ideal for vintage restorations, routine tire changes, and preventative maintenance on classic British motorcycles.
  

Fitment Information

• This standard 18-inch inner tube is intended for tube-type motorcycle rims running tires in the 3.75 to 4.25-inch width range. Common applications include rear and some front wheels on Triumph, BSA, Norton and similar classic machines equipped with 18-inch wheels and conventional tube-type tires. Always verify your wheel size, tire markings and valve stem configuration before installation.
  

Usage and Maintenance Tips

• When fitting a new inner tube, inspect the rim band, spoke nipples and tire carcass for sharp edges or debris that could damage the tube. Use proper mounting tools, avoid pinching the tube during installation, and inflate to the manufacturer’s recommended pressure for your specific tire to ensure optimal performance and safety.

Buy multiples of this or other tubes (click here).

The product images shown are for illustrative purposes only and may not be an exact representation of the product received. Manufacturers occasionally make minor cosmetic changes to items, such as color, finish, label, or design. These changes do not impact the item’s function or compatibility. Please contact us if you have specific concerns regarding appearance.