ProX Carbon Bike Rim Production A1: Carbon pre-preg Cutting For most of carbon rims, Toray T700 carbon fiber pre-preg is used, and Toray T800 carbon fiber is used to make super light carbon rims. In year 2019, we adopot new graphene filling technology to produce our MTB carbon rims (GP series). Graphene filling pre-preg helps to improve the strengh of carbon rims. If keep weight unchanged, the strength can be improved about 20%. If keep strength unchanged, the weight can be reduced about 20%. We use precise machine to cut the pre-preg needed to produce different catagory of carbon rims. A2: Sort carbon pre-preg for different rims During our lay-up design procedure, our engineer has calculated the number of layers that is needed for different catagory of rims. After carbon pre-preg cut, they are sorted to be used for different carbon rims (Road, Gravel, MTB, Fatbike, BMX rims). The worker will get a bundle of cut pre-preg with all material that needed to produce each specific carbon rims. A3: Wrap carbon pre-preg on rim mould After getting the cut pre-preg, our workers will wrap them on rim mould. In thie procedure, they follow the detailed illustration which is provided by our R&D Dept. about how to apply each piece of carbon pre-preg. In the illustration, the number of pre-preg, the position, and angle are all detailed instructed. All new workers need to learn from skilled labors before they do it by themselves. A4: Lay-up and 3D mandrel As showed in picture (A4), 3D mandrel is used during material wrapping procedure. The carbon pre-preg is wrapped on the 3D mandrel, so each layer will be solid and well attached to each other. Besides, 3D mandrel help to make the inner surface of carbon rims smooth, which is important to guarantee strength and stability. B1-B3: curing procedure After layup is finished, the wrapped rim will be put into the mold. Then the mold is put into curing machine, to be baked. The airbag will be inflated to create air pressure, so the prepreg will be well attached to the smooth inner surface of mold. So it is shaped with same shape as the mould that hold it. After taking out from the mould, the rim is cured (become hard). Then we need to sand the redundant resin which is around the rims. C1-C2: drilling procedure After redundant resin and airbag removed from the raw rims, they will be moved for drilling. We use precise 4D automatic drilling machine, which is accurate and efficient compared to traditional manual drilling. As picture (C2) shows, the parameter is preset for different catagory of rims. So same rim will be drilled in the same way as needed (16-18-20-24-28-32-36H). Customized drilling can also be set based on customers' requirement.

ProX Carbon Rim QC And Testing Quality Control and Testing are important procedures before ProX carbon rims brought to market. Before launching, each new product will be tested for quality to guarantee durability and strength. After mass production, samples will also be tested randomly from each batch to ensure quality consistency. The main tests includes: Inflation Test Vertical Rigidity Test Lateral Rigidity Test Spoke Tension Test Braking Test Impact Test Quality Control starts from top-level design, and is implemented in every process of production. The main QC process includes: Mold Check Before every batch of production started, mold condition is checked, make sure the main body and lock of molds are in good condition and cleaness. After every batch of production finished, mold is cleaned, and put in specific shelf which indicated the mold number. Mold number indicates whether it belong to Road or MTB rim mold, as well as the height and width of rim. Dimension Check After each procedure finished, there will be dimension checking before it is moved to next procedure. Such dimension checking includes rim width, height, flatness, roundness, diameter of valve hole and spoke holes, hole distance, etc. Besides, the rim finish is checked, make sure there is no wrinkle or bubble.

ProX Carbon Wheel Building Process The modern Road and MTB cyclists are more varied than ever before, both in physicality and in their expectation for bicycle wheels. To meet the needs of various riders, handbuilt carbon wheel is the best solution. At ProX Wheels, we provide different options of hubs (including DT Swiss 180, 240, 350, as well as ProX own mould hubs, etc) and spokes (Sapim CX-Ray, Race, Pillar 1420, 1423, etc). The main process is split into six steps as showed in below pictures: ① Spoke Lacing Before this procedure, there are some preparatory work of course. We should prepare the carbon rims, hubs, nipples, and calculate suitable spoke length to fit specific rims. Then our wheel building mechanician will get the pack of materials to build each wheel. As all have been calculated and prepared in advance, they can keep working on it without worrying for mistakes during the process. Each spokes will be put into the hub hole first, then laced into appropriate pattern (radial, 2X, 3X, etc). The drive side and non-drive side of rims will be taken into account during spoke lacing. This is critical for asymmetric design carbon rims. ② Pre-tension Spokes After all spokes lacing into proper pattern, they will be pre-tensioned. This procedure takes the slack out of the wheel and makes wheel stiff. Wheels are laternally and radially trued at the basic level at this stage. ③ Dish The Wheel For pre-tensioned wheels, it is important to measure if the hubs ae in the center of carbon rims, which is the basis for further truing. At ProX we control the wheel center tolearance ≤0.3mm. If it exceeds 0.3mm, it will be adjusted until it is under 0.3mm. ④ De-stressing During pre-tension procedure, there are great forces placed on the wheel, which must be relieved. The spoke has to accommodate itself to the shape of hub flange and the nipple should also accommdate itself to the spoke hole. This is an important procedure to make sure the wheel is fully settled and will not wander out of true or drop tension in normal riding. ⑤ Truing And Tension Balancing Our mechanicians use tension meter to measure the tension of each spoke. Normally the spoke tension for same side (drive side or non-drive side) should be the same. If somes pcs of spokes are found too loose or too tight, it will be adjusted a little bit. This procedure may be fone back and forth until all spokes on the same side are with equal tension which is important for wheel performance and longevity. ⑥ Holland Mechanics Pro Truer After wheels built and trued manufally, we put them on to Holland Mechanica Pro Truer. This machine will check the wheel parameter precisely and will highlight the unqualified area (if any). As our wheel mechanicians are all skilled, most of wheels turn out with good result. In case there is anything wrong, our mechanician will get it checked and slightly trued until it is qualified. ProX carbon wheelset building procedure can also be watched in following video:

ProX Custom Decal And Painting We provide custom decal and custom painting service. You can either use our ProX decal, or use your own brand decal. With the customized decal for business, engaging people with your message is simple. Our designer can help to design the graphic if logo provided, and almost all Pantone color can be made. If you'd like the rims/wheels with ProX decal, the recommended ProX logo options are as below. The additional cost is only US$10 per rim which is labor cost to apply the decal on the rims. Below solid colors are the most popular Pantone colors for logo according to our sales record. They are the color options for ProX decal. It means 6 PROX decal patterns with 10 colors options. Pantone Color Code Nickname Image Pantone Color Code Nickname Image Pantone Yellow C Banana Yellow Pantone 361C Grass Green Pantone 186C Ferrari Red Pantone 2728C Vivid Blue Pantone 151C Orange Pantone 871C Metallic Gold Pantone 526C Grape Purple Pantone 877C Metallic Silver White White Black Glossy Black Glossy Matte decal are applied on the rim surface after the sanding process. Then it will be covered under a matte or glossy clear coat. In this case, the decal/logo can't be removed and is more durable. For the glossy decal, unremovable as well, it's applied after the coats and on the top of the rim surface. Black color is the most popular one for the glossy decal which is shining, luxurious but pretty low-key. The rim finish option is only matte for the glossy decal. For the customized logo, please email us a picture, vector diagram if possible, or describe your ideal graphics to get decal file and decal cost. The additional decal fee is charged based on decal type and how many color that used. One sheet of water decal can be used to make around max 10 pcs of rims. Water decal once made, can be kept for max 2 months. If decals not being applied on rims within 2 months, they will become fragile and be discarded. In addition to regular water decals, ProX is also able to make some premium decals by special manufacturing technology to meet brands needs. The cost of such special decals is much higher than regular water decals, and the MOQ is 10 pcs of rims to make such special decals.  Pantone Color Code Image Brushed Silver Chameleon Effect Gold Gilding Gold The rims/wheels with decals will be freshly made after receiving customers’ order and the regular lead time is 12~15 working days roughly. Go with unique logo(ProX logo/your own company logo/personal logo) on the wheels, we are ready to serve you.

ProX Warranty Policy ProX operates under a strict production management system supported by comprehensive quality control (QC) and testing procedures. As a result, our carbon rims and wheelsets maintain a consistently high level of quality and reliability. Due to the nature of carbon manufacturing, which involves multiple hand-built processes, minor defects may occasionally occur. In rare cases, issues may appear after a period of use due to human factors during production. In case any issues found in your product, please feel free to contact the original sales representative you purchased from. This ensures faster order identification and efficient issue handling. 1. Warranty Coverage All ProX carbon rims and carbon wheels are covered by a 2-Year Warranty (starting from the date the package is signed and received). This warranty covers manufacturing defects in materials and workmanship under normal riding conditions. 2. Delivery Inspection Guidelines If packaging is visibly damaged: take photos before opening and inspect carefully a) If product is not damaged: sign for the package b) If product is damaged: record it on delivery slip, take photos, and report to ProX within 3 days (from the date of receipt) 3. Warranty Solutions Replacement Return or Exchange (Swap) Refund 4. Replacement Policy 4.1 Defects Upon Receipt If defects are found upon delivery, submit the following within 3 days (from the date of receipt): Full product photos Close-up images of the defect Visible serial number ProX will evaluate and provide either a replacement or compensation for minor cosmetic issues. 4.2 Defects After Use Within 6 months: free replacement + ProX covers shipping 6–24 months: free replacement, buyer covers shipping Discontinued models: alternative solution will be provided 5. Warranty Exclusions A. Improper Use or Maintenance Incorrect assembly or servicing Maintenance by unauthorized technicians Recommended Hub Maintenance: Standard: every 1,000–1,500 km or 3–6 months Harsh conditions: every 500 km or monthly Clean after wet or muddy rides B. Incompatible Components Use of parts, tires, or accessories not intended or compatible with ProX products. C. External Damage Damage caused by crashes, misuse, heat exposure, or non-compliant usage. D. Spoke Compatibility Supported: double-butted 2.0 / 1.8 / 2.0 mm spokes Not allowed: 2.0 mm straight gauge spokes (voids warranty) E. Third-Party Wheel Building Spoke, nipple, or build issues if wheels are not assembled by ProX. F. Wear and Tear Normal wear items are not covered: spokes, nipples, pawls, bearings, rim tape, etc. 6. Return or Exchange Policy If the products you receive do not match your order (based on the confirmed Proforma Invoice), please do not use the product. Take clear photos of the product and the serial number, and contact your sales representative as soon as possible. LightCarbon will review your order details and work with you to determine an appropriate solution. If a return or refund is approved, it will be subject to the following conditions: a) Any inconsistency must be reported within 3 days after the package is signed for. The product must remain unused until further confirmation from LightCarbon. b) Returned products must be brand new, unused, and in resalable condition, and must be securely packed to prevent damage during return shipping. c) Before shipping any return, you must confirm the shipping address, courier, and declared value with LightCarbon. Failure to do so may result in customs clearance issues, additional costs, and delays in the refund process. d) Once the returned products are received and inspected in good condition, the refund will be processed within 3 business days. 7. Refund Policy Refund requests must be made within 3 days of payment. Orders not yet produced or shipped are eligible for a fast refund process.