CP002 Custom Fiberglass Rear Wheel Fender for Heavy-Duty Trucks

Product Overview

The CP002 is a custom fiberglass rear wheel fender developed for heavy-duty trucks and commercial vehicle body projects. Its molded single-wheel arch forms part of the vehicle’s exterior bodywork while providing clearance around the rear tire.

The fender can be manufactured from an approved drawing, CAD model or physical reference sample. Dimensions, wheel-arch radius, mounting flange, surface finish and local reinforcement are defined around the intended vehicle rather than a universal fitment.

Before tooling or production, the vehicle model, tire envelope, installation side and adjoining body panels must be reviewed. This helps establish whether the CP002 design can be used directly or requires project-specific modification.

Molded Wheel-Arch Design

Single-Wheel Profile

The CP002 uses a one-piece molded profile that follows the shape of a single rear wheel opening. This format can suit truck bodies where the fender attaches directly to an exterior body panel, wheel housing or supporting structure.

The final arch radius should provide appropriate visual alignment and operating clearance around the selected wheel and tire.

Exterior Body Contour

The outside surface can be developed to coordinate with the body lines of the vehicle. Transitions at the front, rear and upper sections of the fender should be checked against adjacent panels before the mold is approved.

Styling features, recessed areas, return edges or adjoining-panel interfaces must be included in the project drawing if required.

Wheel-Area Coverage

The fender helps cover the wheel area and separate the rotating tire from the surrounding vehicle body. Actual control of water, mud and road debris depends on the complete installation, including the wheel housing, mud flaps and any required spray-suppression components.

Vehicle Fitment

CP002 is not presented as a universal replacement part. Fitment depends on the geometry of the intended vehicle.

The following information should be supplied for technical review:

• Vehicle manufacturer and model

• Production year or body generation

• Rear-axle configuration

• Wheel and tire dimensions

• Wheel offset and tire width

• Normal ride height

• Suspension type and travel

• Wheel-opening dimensions

• Existing mounting-hole positions

• Driver- or passenger-side orientation

• Adjacent body-panel dimensions

• Required mud-flap or liner interfaces

• Photographs of the original installation area

The complete tire envelope should be considered instead of using nominal wheel diameter alone. Clearance must remain adequate when the suspension is compressed, the vehicle is loaded and the tire deflects during operation.

Mounting Interface

Integrated Mounting Flange

The CP002 profile includes edge areas that can be developed as mounting flanges. Flange width, angle and hole locations should match the vehicle structure or the approved installation design.

A physical sample may be useful when the existing flange has compound curves or hole positions that are difficult to record in a two-dimensional drawing.

Fastener Loads

Fastener loads should be distributed over a suitable area of the composite. Washers, backing plates or local laminate reinforcement may be specified around the mounting points when required by the installation design.

Fasteners should not be overtightened. Excessive clamping force can damage the finish or create concentrated stress around a drilled hole.

Panel Alignment

The installer should check:

• Wheel-arch position relative to the tire

• Gaps between the fender and adjoining panels

• Alignment of visible body lines

• Mounting-flange contact

• Accessibility of fasteners

• Clearance from pipes, wiring and chassis parts

• Compatibility with liners and mud flaps

Do not drill new mounting holes until the part has been positioned and the approved hole locations have been verified.

Fiberglass Construction

Fiberglass-reinforced plastic allows the CP002 to combine a molded exterior surface with a shape that would be difficult to reproduce from a flat panel.

Unlike unprotected steel, the fiberglass body does not develop red rust. The supplied coating, exposed edges and any metal fasteners still require suitable protection against road moisture, salt, ultraviolet exposure and cleaning chemicals.

The laminate can be developed according to the fender geometry, mounting areas and production requirements. Local reinforcement may be incorporated where the part connects to the vehicle body.

Fiberglass is repairable in many situations, but it is not immune to cracking or impact damage. Correct mounting alignment, sufficient clearance and controlled fastener loads remain important.

Manufacturing Processes

Hand Lay-Up

Hand lay-up can suit prototypes, replacement fenders and lower-volume projects. It provides flexibility when the part requires manual placement of reinforcement or frequent design adjustment.

Resin Transfer Molding

RTM can be considered when the project requires more controlled molding, repeatable surfaces or medium-volume production. Part geometry, tooling design and annual quantity must be reviewed before selecting this process.

Sheet Molding Compound

SMC may suit stable, higher-volume vehicle programs where dedicated production tooling is commercially practical. The part design must be adapted to the selected material flow, pressure and molding method.

The final production process is selected according to the approved design, surface requirements, order volume, tooling budget and dimensional expectations.

Surface Finish

Available project finishes include:

• Gel-coat surface

• Gloss finish

• Matte finish

• Primer-ready surface

• Painted finish

• Custom RAL color

A color reference should identify more than the RAL number when a close body-color match is required. Gloss level, coating system, substrate preparation and approved color sample can all affect the final appearance.

The CP002 should be dry fitted before the final automotive paint system is applied. Trial fitting makes it possible to check the wheel opening, mounting points and adjoining panel gaps before the finished surface is exposed to installation work.

Paint, primer and repair products must be compatible with the fiberglass substrate and the surface supplied.

Development from a Reference Sample

An existing fender can be used as the development reference when original CAD data is unavailable.

Before using an old part as the master sample, inspect it for:

• Collision damage

• Distortion

• Previous repairs

• Missing edge sections

• Enlarged mounting holes

• Uneven panel gaps

• Heat-related deformation

• Surface buildup from previous coatings

Damage should be identified before mold development so that it is not reproduced in the new part.

Where possible, compare the sample with the vehicle body and measure the critical wheel-opening, flange and mounting dimensions independently.

Prototype and Fitment Validation

A first article or prototype is recommended before batch production.

The validation process may include:

1. Reviewing the vehicle data and existing component.

2. Confirming the driver- or passenger-side orientation.

3. Approving the wheel-arch profile and exterior surface.

4. Producing the tooling and initial sample.

5. Positioning the sample on the vehicle.

6. Checking tire clearance through the required suspension range.

7. Verifying mounting holes and flange contact.

8. Reviewing adjoining body-panel gaps.

9. Approving the surface and color standard.

10. Recording any changes before batch production.

The approved drawing, sample or inspection fixture should become the reference for repeat orders.

Applications

The CP002 fiberglass rear wheel fender can be developed for suitable applications including:

• Heavy-duty truck bodies

• Commercial delivery vehicles

• Utility and municipal vehicles

• Construction vehicles

• Special-purpose trucks

• Bus and coach body projects

• Recreational and expedition vehicles

• Low-volume replacement-part programs

Suitability depends on the actual body structure, operating environment, fitment requirements and applicable vehicle regulations.

Technical Specifications

Part dimensions, laminate thickness, weight, tolerances, quantity per set and installation hardware are defined in the approved quotation and technical documents.

Quality Control

Inspection requirements should be based on the approved drawing, master sample or project-specific quality standard.

Checks may include:

• Overall length, width and wheel-arch radius

• Fender depth and return-edge dimensions

• Mounting-flange geometry

• Mounting-hole location

• Driver- and passenger-side identification

• Surface waviness and visible defects

• Edge trimming

• Color and gloss

• Laminate condition

• Fit against a fixture or approved vehicle interface

• Packaging protection

When the complete vehicle is not available at the production facility, final fitment must be validated by the vehicle manufacturer, body builder or installer.

Custom Project Workflow

Submit the Vehicle Data

Provide the truck make, model, year, wheel and tire size, installation side, photographs and existing fender dimensions.

Provide a Drawing or Sample

Supply available 2D drawings, 3D files or a physical reference fender. Identify any damage or design changes required.

Confirm the Technical Scope

Define the material, wheel-arch profile, mounting flange, reinforcement, surface finish, color, quantity and inspection requirements.

Approve the Design and Tooling

Review the production drawing and tooling proposal before mold manufacturing begins.

Validate the First Article

Install or compare the initial sample against the vehicle, original part or approved fixture. Record changes before confirming production.

Begin Batch Production

Production proceeds against the approved technical reference. Later design revisions should be reviewed for their effect on tooling, fitment, price and delivery.

Frequently Asked Questions

Is the CP002 compatible with every heavy-duty truck?

No. It is a custom component that must be matched to the vehicle body, wheel opening and mounting arrangement. Similar wheel sizes do not automatically mean the fender will fit.

Can the driver-side and passenger-side fenders use the same mold?

Not always. A symmetrical design may permit shared geometry, but mounting holes, body contours or surface details can make the two sides different. Both orientations should be checked before tooling.

Can XHY copy an existing damaged truck fender?

A physical fender can be used as a reference, but damage and distortion must first be identified. Missing or deformed areas may require reconstruction from vehicle measurements or additional design data.

Is the CP002 supplied as one piece or as a pair?

The quantity and set composition are defined in the quotation. State whether the order requires one side, a left-and-right pair or a complete vehicle set.

Are mounting holes supplied pre-drilled?

Pre-drilled holes can be evaluated when their positions are controlled by an approved drawing or fixture. For projects with uncertain vehicle tolerances, final drilling may need to be completed during trial fitting.

Are mounting fasteners included?

Fasteners, backing plates and related hardware are supplied only when they are listed in the quotation. Their material and size must match the vehicle structure and installation requirements.

Can the fender be painted to match the truck body?

Custom painted finishes and RAL references can be evaluated. A physical color sample is recommended when the project requires close matching with an existing vehicle finish.

Can a cracked fiberglass fender be repaired?

Some localized cracks can be repaired by a qualified composite technician. The repair must restore the laminate, mounting area and required tire clearance. Replacement may be more appropriate when the damage is extensive or affects several mounting points.

Should the part be painted before trial fitting?

No. The fender should normally be dry fitted before final painting. Installation adjustments, hole drilling or edge correction may damage a completed coating.

What information is required for a quotation?

Provide the vehicle model and year, installation side, wheel and tire dimensions, existing part or drawings, required finish, order quantity and expected annual demand. Photographs should show the complete wheel opening and adjacent body panels.