PARTS UNLIMITED Heavy Duty Inner Tube — Fits 21" rims: 2.75-21, 3.00-21, 80/100-21, 90/100-21, 90/90-21, 100/80-21, 2.8-3.0 mm tube, TR-4 valve
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Heavy Duty inner tube with 2.8–3 mm thick natural rubber for extra puncture protection; ideal for offroad use. TR-4 valve stem.