METZELER TUBE 3.25-3.50-4.10-4.25/85-4.60 -18 110/70-110/80-100/90-110/90 -18 TR4 (CTN 32)

The Metzeler TR4 is a multi-size inner tube designed for 18-inch motorcycle wheels, covering a wide range of both metric and imperial tyre sizes in a single SKU. It fits common 18-inch fitments spanning 3.25 through to 4.60-inch imperial sizes and 100/90 through to 110/90 metric equivalents, making it a practical stock item for workshops and riders who run 18-inch hoops.

Metzeler is a long-established European tyre and tube manufacturer with a heritage in motorcycle rubber. The TR4 denotes a standard straight valve, the most common valve type found on street and dual-sport motorcycles.

• TR4 straight valve — the standard valve type for street and dual-sport motorcycles
• Fits 18-inch rims across a broad range of tyre sizes
• Compatible imperial sizes: 3.25 / 3.50 / 4.10 / 4.25-85 / 4.60–18
• Compatible metric sizes: 110/70 / 110/80 / 100/90 / 110/90–18
• Single SKU covers multiple common 18-inch fitments
• Metzeler brand — established European motorcycle tyre manufacturer

• Inner tube (TR4 valve)

Before fitting, dust the inside of the tyre and the outside of the tube lightly with talcum powder to prevent the tube from twisting or sticking during installation.
Partially inflate the tube before inserting it into the tyre to give it shape and reduce the risk of pinching during mounting.
When seating the tyre bead, work around the rim gradually with tyre levers — avoid levering directly over the tube valve area.
Once mounted, inflate slowly to a low pressure (approximately 10–15 psi / 0.7–1.0 bar), check that the tube is not pinched or protruding, then inflate to the tyre manufacturer's recommended pressure for your specific tyre and load.
Do not exceed the maximum pressure stated on the tyre sidewall.
Inspect the tube for slow leaks by submerging in water or applying soapy water around the valve and bead area if a puncture is suspected.
Store unused tubes in a cool, dark, dry environment away from ozone sources (electric motors, fluorescent lighting) and petroleum products, which degrade rubber.
Avoid folding or creasing the tube during storage; coil loosely or store flat.
Replace the tube if it shows cracking, perishing, significant abrasion, or repeated slow leaks that cannot be reliably repaired.