TUSK Ultra Heavy Duty Motorcycle Inner Tube 110/90x19 & 120/90x19 — 4mm Reinforced Butyl, TR‑4 Valve

The Tusk Ultra Heavy Duty 4mm motorcycle inner tube is an extra-thick, reinforced butyl tube in sizes 110/90x19 and 120/90x19 built to resist punctures and repeated abuse on rough terrain.

Designed for riders who push their bikes off-road, this tube upgrades standard OEM rubber with a 4 mm wall thickness and a TR‑4 valve stem for reliable inflation. Constructed from high-quality butyl rubber, the Tusk Ultra Heavy Duty tube focuses on durability and long service life while keeping installation straightforward. Compatible with a range of bikes (including KTM 250 SX-F 2016–2024 when used with correct rim and tire combinations), it helps reduce flats without adding excessive weight or sacrificing fitment.

How does the 4 mm thickness affect puncture resistance and ride feel?

The thicker 4 mm construction significantly increases resistance to pinch flats, thorns and sharp rocks compared with standard tubes. You’ll feel a modest increase in rolling resistance, but most riders find the trade-off acceptable for far fewer repairs and a more dependable ride on rough trails.

• 4 mm wall for improved puncture protection
• High-quality butyl for consistent air retention
• Acceptable trade-off: slightly heavier with more durability

Will this tube fit my wheel—what sizes and bikes are supported?

The Tusk Ultra Heavy Duty is offered to fit 110/90x19 and 120/90x19 tire sizes, making it suitable for many 19" front and rear applications. It’s listed as compatible with KTM 250 SX‑F (2016–2024) and other makes; always check your tire width, rim diameter and fitment guide image to confirm proper selection.

• Available in 110/90x19 and 120/90x19 sizes
• Works on many off-road and dual‑sport 19" rims
• Refer to fitment guide image for model-specific compatibility

What valve type and installation details should I expect?

This inner tube features a TR‑4 (rubber-stem) valve suitable for most tubed motorcycle rims and standard valve cores. Installation follows normal inner-tube procedures—partially inflate to seat the tube, align the valve in the rim, then fully inflate to recommended pressures while checking bead seating.

• TR‑4 rubber valve stem for standard tubed wheels
• Pre-install partial inflation recommended to avoid pinching
• Inspect tire and rim for sharp edges before fitting

How long will a reinforced butyl tube last under regular off-road use?

Longevity depends on terrain, riding style and maintenance, but reinforced butyl tubes typically outlast standard tubes when exposed to rocks, branches and repeated impacts. Replacing a tube before it becomes brittle and restoring proper tire pressure will maximize its service life.

• Butyl compound resists air loss over time
• 4 mm thickness reduces puncture frequency in rough terrain
• Regular inspection and pressure checks extend lifespan

Who this is for: The Tusk Ultra Heavy Duty 4 mm inner tube is aimed at off-road and enduro riders, trail advocates and anyone who frequently faces sharp, rocky or thorny conditions that cause recurring flats. If you want a straightforward upgrade from stock tubes for fewer roadside repairs and more confidence on aggressive trails, this reinforced butyl tube in 110/90x19 or 120/90x19 sizes is a practical, plug-and-play solution.