Overview

The RSD3 is a dedicated winter drive tire carrying the 3 Peak Mountain Snowflake (3PMSF) rating, with an open shoulder design for snow clearing and zigzag siping across proven tread blocks. It's available in 11R22.5, 11R24.5, and 225/70R19.5 — covering both heavy highway tractors and medium-duty straight trucks.

Why This Tire Matters

The 3PMSF symbol isn't just a winter marketing claim — it means the tire passed an ASTM-specified snow traction test against a reference tire. It's the only legally defined winter tire standard in North America. The RSD3's open shoulder design isn't just for looks: the wide shoulder voids clear packed snow as the tire rotates, preventing snow buildup in the tread that would otherwise reduce grip. The zigzag siping creates thousands of edges that bite into ice and packed snow. For fleets operating in regions where winter means genuine snow accumulation — not just cold pavement — this level of winter-specific design translates directly to fewer weather-related incidents and less time parked waiting for roads to clear.

Key Features

• 3PMSF Severe Winter Certification — Independently tested and certified for snow traction. This is the standard that matters for winter tire performance claims.
• Open Shoulder Design for Snow Clearing — The wide shoulder voids actively eject packed snow, preventing the tread from "packing up" and losing traction. A tire that can't clear its own tread in snow quickly becomes useless.
• Zigzag Siping with Proven Block Design — The siping pattern creates multi-directional biting edges for ice and packed-snow traction. The tread block geometry has been refined through previous-generation designs for balanced wear and grip.
• Available in Medium-Duty Sizes — The 225/70R19.5 size extends winter capability to smaller straight trucks and vocational vehicles that often get overlooked in winter tire lineups.

Best For

Fleets operating in regions with reliable annual snow accumulation; highway tractors on winter routes through mountain passes; medium-duty trucks needing winter traction in cold-climate urban delivery; any operation where the 3PMSF certification is required by regulation or customer contract.

Technical Specs