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WARNING: Cancer and Reproductive Harm —
www.P65Warnings.ca.gov
















Bridgestone's Ultra Heavy Duty tube is the thickest tube in its motorcycle tube lineup, built from 4mm of natural rubber for maximum puncture and pinch-flat resistance. It's sized to original-equipment specifications and intended for motocross and off-road riding, where rim strikes and rock hits are common. Depending on size, it's fitted with either a straight TR-4 metal valve stem or an angled PV-78 stem.
| Part Number | 549673 |
|---|---|
| Material | Natural rubber |
| Thickness | 4mm |
| Valve Type | TR-4 or PV-78 (varies by size) |
| Application | Motocross/off-road, OEM-spec sizing |
Verified from Garamoto’s catalog & fitment data.