Seri Roda · Model EP

EP Snow/Winter Wheel — Standard Specification

Precision roll-formed steel winter wheel series covering 13-inch through 17-inch rim diameters in 4-bolt and 5-bolt configurations. Engineered for reliable cold-weather performance on passenger cars and light SUVs operating in mountainous, highland, and seasonal cold conditions — including Colombia’s Andean highland zones, Bogotá plateau, and high-altitude departamentos where winter tires and snow-specific wheels are required for seasonal and altitude-driven traction demands.

2. Five Key Advantages of the EP Winter Wheel

3. Design and Working Principle of the Snow/Winter Wheel

A winter wheel functions mechanically identically to any passenger vehicle steel wheel — it carries the vehicle weight through the rim bead seat into the tire, transmits traction and braking forces from the hub bolt circle through the disc to the tire contact patch, and maintains the geometric relationship between the hub and the rolling tire that the vehicle manufacturer has specified for correct suspension and handling response. What makes a wheel specifically suitable for winter tire and snow tire use is a combination of dimensional precision, structural robustness, and surface protection properties rather than any fundamentally different mechanism of operation. The critical dimensions that define compatibility with a specific vehicle hub are the same four values applicable to any wheel specification: rim diameter, rim width, bolt circle PCD, center hole diameter, and offset. In the EP series, center hole diameters range from 54 mm (JG05J18, 13×5) to 72.5 mm (JG15JJ27, 15×6), and offsets range from 23 mm to 45 mm across the fourteen configurations — each value matched to the hub interface geometry of the vehicle platforms the wheel was designed to serve.

The roll-forming production process used for these wheels produces the rim barrel by progressively shaping flat steel strip through a sequence of rollers to the final cross-sectional profile — a method that creates consistent wall thickness, good grain structure alignment in the hoop direction, and accurate bead seat geometry without the porosity or thickness variation that can occur in casting processes. The disc is pressed from a steel blank to form the spoke pattern, bolt holes, center bore, and mounting face, then joined to the rim barrel by circumferential welding. The ventilation holes specified for each winter wheel model (from 8 in the smallest size to 20 in larger configurations) perform the essential function of allowing air circulation past the brake components during driving — a function that remains important in winter driving cycles where sustained braking on alpine descents can generate significant heat even in cold ambient conditions. The combination of these design elements produces a winter wheel that performs reliably across the full service cycle: cold installation on a frost-covered mountain morning, sustained alpine descent braking, motorway cruising, and repeated seasonal storage and remounting over multiple years.

4. Material and Surface Protection

The EP snow/winter wheel is produced from flat-rolled structural steel grades selected to meet the combination of cold formability, weld quality, and fatigue performance that the passenger vehicle wheel application requires. The disc is stamped from carbon steel sheet with minimum yield strength of 280 MPa and tensile strength of 380 MPa — grades that deliver the draw depth needed to form the spoke and hub flange geometry without cracking, and sufficient through-thickness impact resistance to absorb the pothole and kerb impact loads that wheels encounter on secondary roads in Colombian mountain departamentos. The rim barrel is roll-formed from a compatible structural steel strip, and the disc-to-rim weld is produced by circumferential projection welding and verified by 100% air leakage testing before surface treatment begins. This weld integrity test is non-negotiable for tubeless passenger vehicle wheels because any porosity in the weld creates a slow air leakage path that the vehicle owner may not notice until tire pressure has dropped to an unsafe level.

Surface protection begins with shot blast cleaning to Sa 2.5 standard — removing mill scale and surface oxides to create a clean, profiled substrate for coating adhesion. Phosphate conversion coating follows, providing additional corrosion inhibition at the steel surface and acting as a chemical primer layer beneath the coating system. Zinc-rich epoxy primer is applied at 30–40 μm dry film thickness, providing active cathodic protection of the steel if the topcoat is scratched through to bare metal. The polyester topcoat — applied at 60–80 μm — provides UV stability, abrasion resistance, and the clean silver-gray or black aesthetic expected of a winter wheel product across its seasonal storage and service cycle. The combined coating system achieves more than 504 hours salt spray endurance per ASTM B117, a test standard directly relevant to the saline-laden road spray that winter wheels encounter in climates using road deicing agents, and applicable to the cold wet mountain environment experienced on Colombian highland passes during rainy season and cold night conditions at altitude.

5. Skenario Aplikasi

The EP winter wheel series serves a range of passenger vehicle applications where seasonal tire changes, cold-weather traction requirements, or wheel economy strategies drive the specification decision. Below are the primary deployment scenarios.

6. Standards Compliance and Winter Wheel Regulations

Winter wheel and winter tire regulations vary significantly by country and region, reflecting different climatic conditions, road safety priorities, and vehicle fleet characteristics. Understanding the applicable framework helps procurement teams and fleet managers select the right product and prepare the documentation needed for compliance demonstration in their target market. The EP series is manufactured under ISO 9001:2015 quality management certification and tested at a national-level wheel testing center equipped to execute all major international wheel performance and safety test protocols.

In Colombia, the Ministerio de Transporte administers the vehicle safety framework under which replacement wheel specifications are governed. Colombian Resolución 4100 de 2004 sets technical standards for commercial vehicle dimensions and axle loads, while vehicle homologation documents specify the wheel dimensions — diameter, width, offset, and bolt pattern — approved for each vehicle model. Replacement wheels must match these parameters; any deviation requires documentation showing the replacement is within the vehicle manufacturer’s approved fitment range. ICONTEC (Instituto Colombiano de Normas Técnicas y Certificación) develops technical standards aligned with ISO references for imported automotive components, and the EP winter wheel’s ISO 9001 certification and SAE-aligned wheel test reports satisfy the documentation requirements most commonly encountered in Colombian customs clearance and parts quality audit procedures. For Colombian highland municipalities and departamentos considering mandatory winter tire regulations on high-altitude routes — a policy adopted by several Andean countries to address seasonal road safety — fleet and vehicle operators should verify applicable local resoluciones and departamento-level traffic regulations that may apply on specific mountain road segments.

In Europe, winter wheel use is embedded in the regulatory landscape for vehicles operating in cold-season conditions. EU Regulation 2019/2144 on type approval requirements for vehicles includes provisions covering wheel and rim specifications, and several EU member states have enacted mandatory or situationally required winter tire laws — Germany under §2 StVO requires winter tires in icy, snow-covered, or frost-slippery conditions; Austria mandates winter tires from November 1 to April 15; Sweden and Finland have mandatory winter tire periods. In each of these markets, the winter wheel must conform to the tire-rim dimensional compatibility specifications defined in the applicable national standard or ETRTO (European Tyre and Rim Technical Organisation) dimensional tables. The EP series wheel dimensions conform to ETRTO-compatible rim geometry. In Canada — another key market for winter wheels and tires — provincial regulations in Quebec mandate winter tire fitment from December 1 to March 15, and several other Canadian provinces have analogous requirements or strong recommendations. SAE J1981 provides the relevant North American wheel performance and test methodology reference for passenger vehicle wheels including winter applications.

7. Tentang Kami

We are a globally recognized manufacturer of roll-formed steel wheels for passenger vehicles, light trucks, commercial vehicles, trailers, and agricultural machinery — operating seven wheel manufacturing bases with combined annual production capacity of 25 million units. Our production facilities are equipped with world-class tooling and equipment from Germany, Sweden, Japan, and Spain, incorporating rim flow forming technology, high-strength steel lightweighting techniques, and automated in-line inspection systems that verify dynamic balance, air leakage, runout, and bolt circle geometry on every completed wheel before dispatch. Our national-level testing center operates as a specialized institution for comprehensive wheel performance verification, executing wheel cornering fatigue, radial fatigue, impact tests, salt spray, CMM dimensional analysis, sparking spectral analysis, and the full range of material and film performance test protocols required by international passenger vehicle wheel standards.

Our passenger car and winter wheel product lines are supplied to major automotive OEM customers as well as to the global aftermarket through importers, distributors, tire retailers, and fleet procurement channels.

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8. Related Products — Complete Your Wheel System

A correctly specified winter wheel works as part of a complete hub-and-axle system. We supply the complementary components needed to build fully compatible wheel assemblies from a single manufacturing source — simplifying procurement and eliminating dimensional compatibility risk between wheel and hub interface components.

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