GDHSWJ 21" Dirt Bike Inner Tubes 2-Pack — 2.75/3.00-21 (80/100-21), 2mm Heavy-Duty TR4 Valves

These are a pair of 21" heavy-duty dirt bike inner tubes (2.75/3.00-21 / 80/100-21) made from 2mm natural rubber with TR4 metal valve stems for reliable off-road performance.

Replace worn or damaged tubes with this two-pack built for common 21" motocross and dual-sport tires. Constructed from resilient natural rubber and fitted with straight metal TR4 valves, these tubes prioritize air retention, puncture resistance, and simple installation. They fit a wide range of popular models from Honda, Kawasaki, Suzuki, Yamaha and other manufacturers, making them a practical spare or repair choice for trail riders, commuters and weekend racers.

Will these tubes fit my 21" dirt bike tire?

Yes — they are sized for 2.75/3.00-21 and 80/100-21 tires. Measure your tire markings to confirm compatibility and check valve type before purchase.

• Compatible sizes: 2.75/3.00-21 and 80/100-21.
• Common fitments include Honda CRF series, Africa Twin, XR650L.
• Kawasaki KLR/KDX and Suzuki DR/DRZ families are supported.
• Also suitable for many Yamaha motocross and enduro models.

How durable and puncture-resistant are these inner tubes?

Made from 2mm natural rubber, these tubes balance flexibility with toughness to withstand off-road impacts and repeated use. The material helps absorb shocks and resist small punctures better than thinner consumer tubes, though heavy-duty tires or liners are advised for extreme conditions.

• 2mm wall thickness for enhanced durability and shock absorption.
• Natural rubber composition resists cracking and maintains elasticity.
• Designed to reduce air loss for longer intervals between inflations.
• Good everyday protection for trail riding and moderate racing.

What valve and sealing features do these tubes include?

Each tube uses a TR4 straight metal valve stem that creates a robust, airtight seal and stands up to repeated pump connections. The metal stem helps prevent bending and leakage compared with some rubber-valved alternatives.

• TR4 straight metal valve for secure air retention.
• Sturdy mounting reduces valve damage during tire changes.
• Compatible with standard tire pressure gauges and pumps.
• Valve design reduces the need for frequent re-seating or repairs.

How simple is installation and maintenance?

Installation follows standard inner-tube replacement steps and is straightforward for anyone familiar with tire mounting. Regular inspection for punctures, valve tightness, and correct inflation will extend tube life and keep riding safe.

• Standard mount procedure using tire irons and proper lubrication.
• Inflate to manufacturer-recommended pressure for your tire and load.
• Inspect for pinches and align valve before final seating.
• Store spares in cool, dry conditions to preserve rubber life.

Who this is for: Riders who need a reliable, economical replacement or spare for 21" dirt bike tires. This two-pack suits trail riders, dual-sport commuters, club racers and DIY mechanics who want a robust inner tube compatible with many Honda, Kawasaki, Suzuki and Yamaha models. Choose these tubes if you prioritize strong air retention, a durable metal valve stem, and broad compatibility for common 21" off-road tires.