325-18 Coker Classic Bias Ply Blackwall Tire
Coker Classic E70K motorcycle tires offer vintage bike enthusiasts a classic tread design and sizes for popular fitments. Coker Classic Motorcycle tires bring great vintage style built with modern rubber compounds to the consumer. For classic or custom, these are fantastic tires for your motorcycle project. Coker Tires Motorcycle selection is huge and features hundreds of fitments for vintage, antique and custom motorcycles.
Blackwall Tire
Since the introduction of carbon black rocked the tire industry, the original recipe for most tires has been a solid black sidewall. For classics and collector cars alike, it's hard to beat the no-nonsense appeal of a classic blackwall style tire. British sports car, classic truck and even hot rod enthusiasts love the way a nice period correct blackwall tire looks on their vehicles.
Bias Ply Construction
Bias ply tire construction is a method that was used from the 1900's through the 1970's on passenger cars and light trucks. Bias ply tires feature ply cords that run at a 45 degree angle to the bead, and overlap in a crisscross pattern, depending on how many ply layers are used. This creates a strong tire, but bias ply tires have a tendency to follow breaks or ruts in the pavement. Bias ply tires are the most authentic choice for classic car restorations and traditional hot rod builds. Coker Tire offers a huge variety of bias ply tires for many applications.
Coker Classic Bias Ply Tires
Coker Classic bias ply tires are designed for classic cars and trucks, as well as hot rods and customs. With many popular sizes, including 670-15, 600-16 and alphanumeric sizes like L78-15, this product line fits many classic makes and models.
Coker Classic Brand Collector Vehicle Tires
Coker Tire was founded in 1958, focused on supplying the collector vehicle market with authentic tires. The Coker Classic brand is a favorite among car restorers and enthusiasts around the world. Coker was the first to develop the wide whitewall radial, and it's still one of its most popular product lines to this day. Coker Classic tires are offered in both bias ply and radial construction, using modern materials to ensure proper fitment and handling for your collector vehicle.
Please Note
- Tire mounted on wheel for demonstration purposes only. Wheel and other accessories are not included. Please note that dimensions listed (tread width, section width and overall diameter) are non-scientific and based on an inflated tire, mounted to a wheel. Dimensions may vary due to rim width and inflation pressure.
| SKU | 71306 |
|---|---|
| Weight | 15.000000 |
| Brand | Coker Classic |
| Product Size | 325-18 |
| Tube Type or Tubeless | Tube Type |
| Rim Diameter | 18 inch |
| Tire Construction | Bias Ply |
| Tire Series | E70K |
| Sidewall Style | Blackwall |
| Motorcycle Sizes | 325-18 |
| Section Width (IN) | 3.5 |
| Rim Width (in) | 1.85 - 2.00 |
| Overall Diameter (IN) | 25.16 |
| Availability Date | 2011-01-31T00:00:00Z |
325-18 Coker Classic Bias Ply Blackwall Bias Ply Tire
Frequently Asked Questions
Fitment & Compatibility â–¼
The Coker Classic Motorcycle E70K 325-18 is designed for motorcycles that originally used a 325-18 tire size and an 18-inch wheel. It is particularly well suited to vintage and antique motorcycles, as well as restoration projects that require period-correct sizing and appearance. Before purchasing, confirm that your motorcycle manufacturer specified a 325-18 tire or an equivalent size.
Fitment should never be based solely on tire size markings. Owners should also verify available clearance around the fender, swingarm, fork legs, and brake components. Because the tire has an overall diameter of approximately 25.16 inches and a section width of 3.5 inches, checking actual available space helps prevent installation problems and ensures proper operation.
The Coker Classic Motorcycle E70K 325-18 is intended for vintage motorcycle applications that originally used narrow bias ply tires and 18-inch rims. Many classic British, American, European, and Japanese motorcycles from the mid-twentieth century utilized tire sizes similar to the 325-18 specification, making this tire attractive for restoration projects.
Because fitment varied significantly between manufacturers and model years, buyers should consult factory specifications before ordering. The tire's vintage sizing and classic tread pattern make it particularly appealing for enthusiasts seeking authentic visual proportions. Matching the original tire dimensions helps preserve the motorcycle's intended appearance and handling characteristics.
The product page identifies the Coker Classic Motorcycle E70K 325-18 as a motorcycle tire but does not specifically designate it as a front-only or rear-only application. Buyers should consult their motorcycle manufacturer's recommendations and verify whether the original fitment used a 325-18 tire on the front, rear, or both positions.
Classic motorcycles often used similar tire sizes at both ends compared with many modern motorcycles. However, proper fitment remains important because wheel widths, load distribution, and handling characteristics vary between front and rear applications. Confirming intended usage before installation helps maintain the motorcycle's original performance and appearance.
Yes, the Coker Classic Motorcycle E70K 325-18 is specifically designed for use on an 18-inch motorcycle wheel. The size designation includes the wheel diameter requirement, making wheel compatibility straightforward for motorcycles originally equipped with 18-inch rims.
While wheel diameter is correct, buyers should also verify rim width compatibility. The product specifications list an approved rim width range of 1.85 to 2.00 inches. Installing the tire on a wheel outside that range may alter tire shape, footprint characteristics, and handling behavior. Confirming both wheel diameter and rim width helps ensure proper fitment and performance.
Tire Size Equivalents & Conversions â–¼
The 325-18 designation identifies two important dimensions of the Coker Classic Motorcycle E70K 325-18. The "325" refers to the tire's nominal width classification, while the "18" indicates that the tire is designed to fit an 18-inch diameter motorcycle wheel. This sizing format was commonly used on vintage motorcycles and remains familiar to restoration enthusiasts.
Unlike many modern metric motorcycle tire sizes, older sizing systems provide less detailed dimensional information directly in the size designation. Buyers restoring classic motorcycles often seek original-style sizes like 325-18 because they help maintain factory-correct proportions, appearance, and fitment characteristics that match the motorcycle's original design.
The Coker Classic Motorcycle E70K 325-18 uses a traditional sizing format that differs from modern metric motorcycle tires. Modern tires typically include width, aspect ratio, and wheel diameter within the size designation, while vintage motorcycle sizes rely on older industry standards that were common during the motorcycle's original production era.
When replacing a tire on a vintage motorcycle, it is usually best to match the original size whenever possible. Although some riders may consider metric alternatives, the Coker Classic Motorcycle E70K 325-18 is intended to preserve authentic dimensions and visual proportions. This can be particularly important for restorations where originality and period-correct appearance are priorities.
The Coker Classic Motorcycle E70K 325-18 has an overall diameter of approximately 25.16 inches when mounted and inflated under specified conditions. Overall diameter influences ride height, gearing characteristics, fender clearance, and the motorcycle's overall stance.
A significant change in tire diameter can alter the way a motorcycle sits and performs. Maintaining an overall diameter close to the original specification helps preserve factory geometry and appearance. Riders replacing an existing tire should compare dimensions carefully, especially when restoring motorcycles where original handling characteristics and visual authenticity are important considerations.
Performance & Use Case â–¼
The Coker Classic Motorcycle E70K 325-18 is designed for riders who want vintage styling combined with updated rubber compounds for classic motorcycle applications. Its bias ply construction and traditional tread pattern are intended to maintain the authentic appearance and riding character expected from older motorcycles.
Everyday riding behavior depends on the motorcycle, suspension setup, rider style, and road conditions. Because the tire uses bias ply construction, riders may notice characteristics different from modern radial motorcycle tires. Owners restoring classic bikes often choose this type of tire because it preserves the original look and feel while providing a more modern tire material.
The Coker Classic Motorcycle E70K 325-18 is best suited for motorcycle enthusiasts who prioritize vintage appearance, restoration accuracy, and period-correct fitment. It is especially appealing to owners of antique motorcycles, classic bikes, and custom builds where maintaining an authentic visual style is important.
This tire is not aimed at riders looking for modern sport motorcycle performance characteristics. Its purpose is to complement classic motorcycle designs while offering modern rubber technology. Riders choosing the Coker Classic Motorcycle E70K 325-18 should consider their motorcycle's intended use, original specifications, and the handling characteristics expected from a traditional bias ply tire.
The Coker Classic Motorcycle E70K 325-18 features a classic tread design that complements vintage motorcycle styling. For many restoration enthusiasts, the appearance of the tire is an important part of completing an authentic-looking motorcycle because modern tread patterns can look out of place on older machines.
The traditional design helps maintain the visual balance of classic motorcycles, especially when paired with original-style wheels and components. While appearance is a major factor, the tread pattern also contributes to the tire's overall behavior on the road. Buyers should consider both styling goals and intended riding conditions when selecting the tire.
The Coker Classic Motorcycle E70K 325-18 combines vintage design elements with modern rubber compounds to address a common challenge among restoration enthusiasts. Many classic motorcycle owners want the correct appearance of an original tire without relying on decades-old tire technology.
The bias ply construction preserves traditional characteristics associated with vintage motorcycles, while updated materials help support reliability compared with old, aged tires. This balance makes the tire suitable for riders who value authenticity but also want a tire produced with current manufacturing methods. It allows classic motorcycles to maintain their intended appearance while being more practical for regular riding.
Construction, Durability & Load Capacity â–¼
The Coker Classic Motorcycle E70K 325-18 uses bias ply construction, a traditional tire design commonly found on vintage motorcycles. Bias ply tires use overlapping cord layers that create a strong casing structure and maintain the classic profile expected on older motorcycle applications.
This construction style helps preserve the original riding character and appearance of vintage motorcycles. Compared with modern radial tires, bias ply tires may provide a different steering feel and road response because of their construction. Riders restoring classic motorcycles often choose bias ply tires like the Coker Classic Motorcycle E70K 325-18 because they match the engineering style and aesthetics of the era.
The bias ply construction of the Coker Classic Motorcycle E70K 325-18 contributes to the traditional ride characteristics associated with vintage motorcycles. The layered casing design influences sidewall behavior and how the tire absorbs road irregularities compared with many modern radial motorcycle tires.
Ride quality is also affected by motorcycle weight, suspension design, wheel condition, and inflation pressure. The Coker Classic Motorcycle E70K 325-18 is intended to complement classic motorcycle setups rather than replicate the feel of a modern performance tire. Riders seeking authentic vintage handling characteristics often prefer bias ply construction for its period-correct behavior.
Installation & Maintenance â–¼
The Coker Classic Motorcycle E70K 325-18 is listed as a tube type tire, meaning it is designed to be used with an appropriate inner tube rather than as a tubeless setup. Proper tube selection is important because the tube works together with the tire to maintain air pressure and support safe operation.
When installing the Coker Classic Motorcycle E70K 325-18, owners should inspect the wheel rim condition and ensure there are no sharp edges or damage that could affect the tube. Using the correct tube size and installation method helps prevent air loss, uneven seating, and potential tire performance issues.
Before mounting the Coker Classic Motorcycle E70K 325-18, verify that the motorcycle uses an 18-inch rim and that the rim width falls within the recommended 1.85 to 2.00 inch range. Correct wheel compatibility helps maintain the intended tire profile and handling characteristics.
Owners should also inspect the rim condition, spoke area, and surrounding components before installation. Fender clearance, fork clearance, and suspension movement should be checked to confirm there is enough room throughout operation. Proper verification before mounting reduces the chance of fitment problems and helps preserve the motorcycle's original design characteristics.

