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Dominate challenging closed courses and clear loose singletrack lines with the groundbreaking performance of the ProTaper MXT 04 Front/Rear Motorcycle Tire [MPN: 023307]. Representing the legendary control brand's bold entry into high-performance rubber technology, this premium 110/90-19 rear racing tire is engineered from the ground up for competitive off-road racing and aggressive trail riding. Built with an ultra-rugged carcass compound layout, it strikes an absolute balance between extreme durability, optimal structural block stiffness, and professional-grade traction.
Part number 023307 is manufactured using an industry-standard full-size motocross rear casing profile. Because this is a high-performance universal race tire designated by physical dimension metrics rather than vehicle brand lines, it is a verified direct replacement fit for nearly all modern 125cc to 450cc dirt bike platforms running a 19-inch rear wheel rim setup, including:
CRITICAL NHS CLOSED-COURSE COMPLIANCE, TUBE SPECIFICATION, AND BREAK-IN WARNINGS:
**Not For Highway Service (NHS) Safety Alert:** Please pay close attention to your vehicle's environment prior to installation. **This racing tire is strictly rated as NHS (Not for Highway Service)**. It does not carry Department of Transportation (DOT) approval and is completely illegal for use on public streets, dual-sport highway runs, or paved roads. It is engineered solely for closed-course tracks and off-road dirt trails.
**Mandatory Tube-Type Inner Assembly Logic:** This tire features a classic, heavy-duty Bias-Ply Tube Type (TT) bead construction layout. **It cannot be run tubeless**. It requires the workshop installation of a dedicated motorcycle inner tube and fresh rim strip band during wheel assembly. Running this tire without an inner tube will result in immediate, dangerous deflation.
**Critical Initial Scuff Break-In Protocol:** New motocross compounds feature a slick mold-release sheen across the outer tread blocks straight from the factory floor. **Riders must exercise calculated caution during the first 1–2 laps of track use**. Avoid pulling maximum throttle loads out of starting gates or hitting extreme lean-angle corner corners until the knob faces have been thoroughly scuffed against the track to establish absolute bite traits.
| Attribute | Specification |
|---|---|
| Tire Size Metric Designation | 110/90-19 (Width: 110mm / Aspect Ratio: 90% / Bias) |
| Wheel Rim Diameter Suitability | 19 Inch Rear Rim Fitting |
| Tire Terrain Classification | Intermediate to Hard Terrain Matrix |
| Carcass Construction Class | Bias-Ply Heavy-Duty Off-Road Core Structure |
| Legal Compliance Index | NHS - Not for Highway Service (Closed-Course Track Only) |
| Tread Design Architecture | Asymmetrical Molded Blocks with Knob and Groove Tracking |
| Tire Application Class | Tube Type (TT) — Requires matching inner tube |
| Primary Application Position | Rear Wheel Position Only |
| Manufacturer Part Number | 023307 |
US Dollars
