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, Powerway, 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: A1: 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. A2: 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. A3: 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. B1: 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. B2: 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. B3: 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 has strict production management system, QC and Testing process. In most instances, our quality is very good and stable. As there are many hand made procedures during carbon rim production, accidents will happen. Sometimes, due to workers' mistake or negligence, there would still be some rims (or wheels) found with defects after some time of use. For all carbon rims and carbon wheels sold by ProX, we offer 2 years' quality warranty (starting from the date of package signed for). For any after-sale issue, please contact the salemen or saleswomen you bought from. So they will know what you have bought, and report the issues sooner. When you receive a package with obvious damage, please take pictures of the package first and inspect the items carefully before signing for it. If the product inside is not damaged, sign for it. If the product is damaged, report this on the delivery slip, take pictures of the damage products, and refuse to sign for it. So it will be returned to us. The form of warranty includes Replacement, Return or Swap, Refund. 1. Replacement If defects of proucts found upon receipt, please take pictures of the whole product, defective area, as well as serial number. Please make sure to send the information as well as pictures to ProX within 7 days upon receipt. ProX Ater-sale Dept. will assess and negotiate with you for the solution, either replacement or discount (if just small small apperance issue). After some time of use, if there is quality issue found on our products: 1) If quality issue occurs within 3 months (from the delivery date), ProX is obligated to replace the rim and bear shipping cost. If quality issue occurs from 3 months to 24 months, ProX is obligated to replace the rim, but buyer should bear shipping cost. 2) In case the rim you bought was no longer available, ProX will regotiate with you and Warranty does not cover: A) Improper assembly, maintenance, or maintenance by an unauthorized technician. B) Installation of parts or accessories or tires that are not originally intended for, or compatible with the rims or wheels as sold. C) Damage or failures caused by a crash, accidental damaged, abuse of the product, heat damage (typically caused by the wheel sitting too close to vehicle exhaust), non-compliance with manufacture specifications of usage or any other fractious reasons. D) The strongest spokes that can be used on our rims are double butted 2/1.8/2mm. Straight gauge 2mm straight gauge spokes are not allowed to be used on our rims or there is no warranty (they are too stiff to be used for carbon rims). E) Spokes, nipples, or wheel building issues if the wheels were not built by ProX. F) Normal wear and tear (Spokes, nipples, pawls, bearings, rim tape etc.) 2. Return or Swap If the products you got from ProX found to be defective or inconsistent with your expectations (incorrect shipment or incorrect order placement), you could require for return or swap. Return or swap requirement should be submitted within 30 days upon receipt. The basic requirement for products that you'd like to return or swap: 1) The products should be new and have not been used . 2) The products should be well packed in original carton or new box that is suitable for international shipment. 3. Refund If you change your mind and do not need the rims (or wheels) any more, please contact the sales of ProX within 3 days (from the date paid). If your order still have not been made or shipped, normally refund can be done very soon.