Silca Protocol RCG-1 Tubeless Gravel Tire

The SILCA Protocol RCG-1 Tubeless Gravel Tire shatters conventional tire design. For years, the cycling industry treated gravel tires like oversized road tires—pumping up thick, heavy rubber casings with sluggish tread blocks as volume increased. SILCA turned the paradigm on its head: rather than blowing up a road tire, the Protocol RCG-1 was born by taking a championship cross-country (XC) mountain bike tire and distilling it down to its purest, fastest gravel racing essentials.

Engineered around modern wide rims and low inflation pressures, the Protocol RCG-1 combines an inverse-thickness 120 TPI supple casing, zero-stretch Carbon BeadLock™ construction, and an asymmetric variable-height tread layout to deliver blistering rolling speed on hardpack with aggressive bite through loose corners.

Inverse Casing Architecture & The Physics of Deflection

Historically, tire makers assumed that wider gravel tires required thicker, stiffer carcasses to survive sharp gravel. SILCA’s rolling resistance lab proved the exact opposite: high-volume tires running at modern gravel pressures naturally distribute impact energy over a significantly wider contact patch.

Think of it like the dangling ends of a mop head: loose, low-tension strands are nearly impossible to slice with a blade, whereas strands pulled taut cut instantly. By designing the 120 TPI casing to operate at low structural tension, the Protocol RCG-1 deflects around trail hazards instead of shearing. This allows SILCA to utilize a thinner, faster-rolling tread compound that delivers benchmark wattage savings while remaining remarkably resilient against flats.

Variable-Height Asymmetric Tread Architecture

Most traditional gravel tires struggle when pushed hard into corners. Uniform knob heights force the entire tire casing to deform under lateral load until tread blocks pinch closed, flatten out, and lose their biting edges. The SILCA Protocol RCG-1 solves this with a progressive variable-height tread architecture:

• Directional Center Track: Low-profile center blocks minimize rolling resistance and vibration on pavement, tarmac connectors, and packed dirt.
• Independent Braking & Acceleration Edges: Asymmetric fore-and-aft tread blocks provide directional drive traction during steep out-of-the-saddle climbs and decisive stopping power under heavy braking.
• Taller 40-Degree Shoulder Knobs: Outer lugs stand taller than the center tread, engaging gravel surfaces earlier and at shallower lean angles to rail corners without casing squirm or edge collapse.

Carbon BeadLock™ & Latex-Friendly Tubeless Integration

Folding tires have historically relied on Kevlar beads, which inherently absorb ambient moisture over time. This triggers material "creep"—resulting in shrinkage, localized bead lumpiness, and frustrating side-to-side tire wobble. SILCA completely eliminated Kevlar in favor of ultra-stiff Carbon BeadLock™ technology. With zero material stretch and zero moisture retention, the tire locks into the rim bead channel with absolute precision for the entire lifespan of the tire.

Furthermore, standard tire manufacturing leaves behind silicone or petroleum-based mold release chemicals that actively repel tubeless sealant. SILCA treats the inner casing of the Protocol RCG-1 with a proprietary, latex-friendly mold release agent that actively bonds with sealant—such as SILCA Ultimate Tubeless Sealant 2.0—for near-instant puncture sealing and airtight bead setup right out of the box.

Technical Specifications:

Frequently Asked Questions & Setup Notes