1. What’s the data of my BMW 3 Series E21 wheel spacers?
The data of BMW 3 Series E21 wheel spacers is Bolt Pattern (PCD):4×100, Center Bore (CB):57.1, Thread: M12x1.5. These items are also compatible with vehicles in the same bolt pattern, center bore diameter, and thread size as BMW 3 Series E21 320i 323i 1975-1983. For details, please check Are these wheel spacers compatible with my vehicle.
2. Why should I choose BONOSS BMW 3 Series E21 wheel spacers?
Since 2007, BONOSS has been committed to producing high-quality, high-safety, and high-stability automotive wheel accessories (wheel spacers, wheel bolts, wheel nuts, etc.). We pay attention to the safety and quality of BMW 3 Series E21 wheel spacers and other accessories. BONOSS has over 10 years of professional design and manufacturing experience, trusted by more OEM brands and professionals. We have sufficient inventory to ensure faster delivery, and customize wheel spacers only in 3 days. Professional pre-sales consultation will solve your confusion, please feel free to contact us, after-sales warranty for 10 years will be more rest assured. BONOSS wheel spacers provide higher performance, more additional functions, fast customized service, and friendly service while maintaining a more competitive price, which is your best choice.
3. How does the “active cooling” function work on my BMW 3 Series E21 320i 323i wheel spacers?
As a professional wheel spacers manufacturer, BONOSS has created the world’s first “active cooling” technology based on years of experience, breaking the long-term single function of the wheel spacers. Through the rotation of the wheel spacers, the external cold airflow takes away the internal heat through the active cooling grooves, so as to achieve the purpose of active cooling, improve the braking efficiency and reduce the risk of driving safety. Installing BONOSS forged active cooling wheel spacers on BMW 3 Series E21 can improve braking efficiency, maintain the brakes at normal temperature, and ensure your driving safety. The production cost of BONOSS “active cooling” technology is almost the same as that of traditionally designed wheel spacers. You don’t need to pay extra, that’s why we say that BONOSS forged active cooling wheel spacers are particularly price-friendly. BONOSS wheel spacers provide more additional functions, higher safety, higher performance, more professional design, and a better installation experience. For details, please check BONOSS Active Cooling Wheel Spacers Benefits.
4. Are BMW 3 Series E21 320i 323i wheel spacers safe?
Generally, wheel spacers are made of steel or aluminum. They are just the automobile accessories installed between the assembly hub and wheel. As long as you use high-quality BMW 3 Series E21 wheel spacers and install them properly, they are safe. Take the BMW E21 323i 4×100 wheel spacers as an example, we use forged AL6061-T6 material (tensile strength ≥310Mpa), modern CNC machining by 0.02mm tolerance. All of our products have got more than 50 SGS TUV authoritative test reports. Compared with those cheap casting wheel spacers, BONOSS forged active cooling wheel spacers are safer, higher performance, and more professional in design. We believe more professional production offers more value for customers. For details, please check Are Wheel Spacers Good or Bad.
5. Why do my BMW 3 Series E21 need hub centric wheel spacers? What’s the difference between BONOSS multi-stage hub centric wheel spacers and others hub centric?
BMW 3 Series E21 hub centric wheel spacers offer a better system of support and stability. They are designed to make a snug connection between the wheel and vehicle hub, reducing the high-speed vibration and ensuring safer driving. Compared with an ordinary hub centric. BONOSS uses the multi-stage hub centric design, which means that multi-stage hub-centric can make the spacers more closely fitted to the wheel hub, greatly reduce the vibration of high-speed caused by the inaccurate hub centric. Besides, they can also be used to change the center diameter of your car, making it possible to install wheels with different center diameters to your vehicle properly, transforming lug-centric wheels into hub centric wheels. For details, please check Why do You Need Wheel Spacers with Hub Centric Rings.
6. What are BONOSS BMW E21 320i 323i wheel spacers made of?
BONOSS forged active cooling wheel spacers for BMW 3 Series E21 are made of high-grade 6061-T6 aluminum alloy. They are formed by withstanding continuous strong pressure that improves the strength of the wheel spacers. And the aluminum alloy has many excellent characteristics, such as high strength, wear-resistance, impact resistance, and high-temperature resistance, performs good mechanical properties: Tensile Strength≥310Mpa, Yield Strength≥275Mpa, and Failure Elongation≈10%. Compared with ordinary AL6061 materials, the tensile strength and yield strength are about three times higher. BONOSS insists on producing professional forged wheel spacers, which are safer, more professional. For details, please check How to Choose Safe Wheel Spacers.
7. What’s the performance of the BONOSS forged grade 12.9 wheel bolts on BMW 3 Series E21 wheel spacers? What’s the special meaning of BONOSS engraved?
BONOSS forged grade 12.9 extended wheel bolts are made by the forging process which brings excellent mechanical and physical properties. Each of them is engraved with “B”, which means that these are manufactured by BONOSS own factory, the quality is guaranteed. They have achieved ISO standard grade 12.9, tensile strength≥1,282Mpa, ultimate tensile load≥152,000N, hardness (HV)≥395, NSS≥500H, two million times limited life range test without damage… They are strong enough to use in daily driving, off-road, and other scenes. The head of the extended wheel bolt has a 12 petal shape, this design is proof of the Super Forging Process (the petal-shaped can only be manufactured by a large tonnage machine for forging at one time.). For those wheel bolts that are only marked in metric units without branding, BONOSS wheel bolts are safer and more reliable. For details, please check How to Improve Wheel Spacer Safety.
8. Can I customize BMW 3 Series E21 wheel spacers only in 3 days?
BONOSS owns an independent OEM factory, so that custom wheel spacers can be completed only in 1-3 days. OEM/ODM is available. If you’re looking for an unusual thickness or bolt pattern conversion to fit custom wheels that won’t work with standard wheel spacers, look no further than BONOSS custom-made wheel spacers for your BMW 3 Series E21 320i 323i. BONOSS offers non-normal thickness customized service, a minimum of 0.1″ (3mm) thick, a maximum of 6.4″ (160mm) thick are available. There are a large amount options with our customized PCD conversion wheel adapters, etc. 4×100 to 4×114.3 adapters, 4×100 to 5×100 adapters, 4 to 5 lug adapters, and thread sizes, thicknesses, and bolt patterns are customized to your exact request on wheel adapters. For details, please check BONOSS Custom Wheel Spacers Service.
9. Do you have any SGS TÜV test reports of BMW 3 Series E21 wheel spacers?
SGS and TÜV Rheinland as the world’s famous testing service companies, standing for safety and quality. To earn customers’ trust, which is also our confidence in product quality. BONOSS has fully passed over 66 ISO standard SGS, TÜV authoritative tests, and all achieved excellent scores.BONOSS forged grade 12.9 extended wheel bolts have passed the SGS 2,000,000 times limited life range test without damage, tensile strength≥1,282Mpa, ultimate tensile load≥152,000N, hardness (HV)≥395, NSS≥500H… By these authoritative test reports, BONOSS truly achieves the quality and professionalism expressed in the form of data and truly guarantees safety. We believe high standard quality management, together with authoritative certification reports is the best way to meet customer and regulatory requirements. For details, please check BONOSS Wheel Spacers Quality Certificated.
10. What are the benefits of the knurling design on my BMW 3 Series E21 320i 323i wheel spacers?
The knurling design can enhance the aesthetics of the BMW 3 Series E21 wheel spacers by introducing an attractive pattern to the side surface. Knurling patterns can enlarge the side area so that it can contact more air, boost the heat dissipation effect, and reduce the internal stress caused by machining. That means improving the performance, strength, and durability of the BMW 3 Series E21 wheel spacers. BONOSS aims to provide wheel spacers with more additional functions, safer, higher performance, more professional design, and better installing experience, that is why we insist on independent manufacturing and continuous optimization of the design. For details, please check Are Wheel Spacers A Good Idea.
11. How do BMW 3 Series E21 wheel spacers affect handling?
Installing wheel spacers is a cost-effective way to increase the wheel track by pushing your wheels away from the hub. A wider track means better traction, allows you more stable turning, improving the handling of your vehicle, even driving in bad weather, it won’t lose its grip. Moreover, most track racing cars will use every millimeter of wheel space available in their design for the highest performance and the best exteriors. With BMW 3 Series E21 wheel spacers on, you can fill the gap in your fenders and get a more aggressive and powerful look. Meanwhile, BONOSS forged active cooling wheel spacers are accurate to 0.02mm, a more perfect fit to the wheel hub, which means that high-speed vibration is reduced, and offers a smoother driving experience. For details, please check Wheel Spacer Handling Improvement.
12. Why do I need BMW E21 320i 323i wheel spacers fit for aftermarket wheel rims?
An excessive positive offset will cause the inner edge of your rims and tires to rub against the suspension components. In this case, wheel spacers can create the clearance needed to avoid friction and correct the offset by pushing away from the vehicle hub. They can also be used to change the bolt pattern and center bore diameter of your car. In this way, modified rims with different data can be installed correctly. For example, BBS wheel rims, HRE wheel rims, WORK wheel rims, APEX wheel rims, etc. BONOSS has thousands of successful cases of manufacturing spacers for aftermarket wheel rims issues. Compared to those cheap casting spacers, BONOSS forged high-grade wheel spacers are safer and more professional. For details, please check When to Use Wheel Spacers for Aftermarket Wheels.
13. Can BMW 3 Series E21 wheel spacers clear the clearance problems?
Higher-performance brake kits are often bigger than the stock parts. A wheel spacer provides the space needed for larger calipers that cannot fit in the factory wheel space. By pushing out the wheels, you can get a larger ideal gap of the brake caliper without having to rub it when installing the wheel. These items function as Brembo wheel spacers, EBC wheel spacers, AP racing wheel spacers, Bosch wheel spacers, etc. And for safety and quality, purchasing from a professional manufacturer is trustable. BONOSS has thousands of successful cases of manufacturing spacers for big brakes issues. Compared to other cheap casting wheel spacers, BONOSS forged active cooling wheel spacers are safer and more professional. For details, please check When to Use Wheel Spacers for Big Brake Kit.
14. What do BMW 3 Series E21 320i 323i wheel spacers do for wide-body kit/aero kit?
The wide-body enclosure usually includes large brake calipers and large wheel hub modifications. Wheel spacers allow you to install larger wheels and larger brakes which is a great safety upgrade especially if you plan to take your widebody car onto a track. Installing wheel spacers on BMW 3 Series E21 is one of the easiest and most cost-effective options to get low and wide as well as to get flush the fender flares. Properly filled wheel arches can really make your widebody builds look wonderful. These items function as Mansory widebody kits wheel spacers, Duraflex widebody kits wheel spacers, Liberty Walk widebody kits, etc. BONOSS insists on manufacturing safer and more professional wheel spacers, which is a good choice for your excellent widebody kits. For details, please check When to Use Wheel Spacers for Wide-body Kit.
15. Can wheel adapters solve the offset problems for installing other vehicle wheels on my BMW 3 Series E21 320i 323i?
In a sense, a wheel adapter is also a wheel spacer. Wheel spacers are used for clearance problems with brakes, tie rods, and other suspension components, to push the wheels outward and make the wheels more flush with the fender. Wheel adapters do all the same things as wheel spacers do. However, wheel adapters can change the bolt pattern and center bore diameter to allow you to bolt up wheels that are not made for your car. Installing wheel spacers can help you perfectly solve the problem of the wheels. To have better turning performance, smoother driving experience, and fuller appearance. For details, please check Do you need wheel spacers or wheel adapters.
16. How thick BMW 3 Series E21 wheel spacers do I need?
Here is a simple method: use a straight edge such as a metal ruler, place the straight edge on the outermost part of the rims where the wheel comes closest to the fender (preferably the top), then, measure from the outside wheel to the straight edge. This distance is the size spacer you will need to achieve the look that flushes or nearly flushes with the fender line. Too thin, you will still have wheel/caliper interference. Too thick, and your tires will hit the fenders. Use proper size of spacers not only ensure safety but also avoid breaking your local laws and regulations. Currently, BONOSS provides 25mm-50mm thickness wheel spacers to meet your needs. For more information, please check How to Measure Wheel Spacers for My Vehicle.
17. How to install BONOSS BMW E21 320i 323i wheel spacers?
The wheel spacers installation is an easy job for you. Hopefully, the instructions below can help those of you keen to install wheel spacers yourself. For more details, check on How to Put Spacers on Wheels.
18. Where can I buy wheel spacers near me?
BONOSS will have operated stores around the world, you can find the nearest operated store through Wheel Spacers Near Me, or place an order on our official website to purchase our products.
1. How can I get my BMW 3 Series E21 320i 323i wheel spacers? How much does the shipping cost? Does it include domestic import duties?
After you place an order, BONOSS shipping department will give priority to FedEx, DHL, TNT, UPS, EMS, and other express delivery, striving to deliver the BMW E21 320i 323i wheel spacers you ordered to you in the shortest possible time. The freight calculation is based on the shipping weight and volume, excluding tariffs! It does not include special service fees in remote areas (in rare cases, we will contact you in advance if there are any).
2. When will my BMW 3 Series E21 wheel spacers be shipped?
BMW 3 Series E21 Wheel spacers in stock are generally shipped within 24 -48 hours. For customize BMW 3 Series E21 wheel spacers are generally shipped within 3 days (some special customized orders or models may take longer). Once your BMW 3 Series E21 wheel spacers are shipped, we will provide you with the tracking number through the email you provided. Remember to check your email. If you have not received the tracking number or have other questions, please contact our customer service.
3. How long does it take to get my BMW 3 Series E21 wheel spacers?
Generally, it takes 3 to 7 days for shipping. Due to aviation, weather, politics, customs clearance, and other factors, the delivery time may be a bit delayed. In this case, we will follow up the whole process to ensure that your BMW 3 Series E21 320i 323i wheel spacers can be delivered to you faster, it will not take a long time, please feel free. Hope you’ll feel satisfied when receiving the BONOSS wheel spacers.
4. Where will my BMW 3 Series E21 320i 323i wheel spacers be sent from?
BONOSS has multiple distribution centers around the world, in order to allow you to receive the items more quickly, we will give priority to the warehouse closest to your delivery address or the warehouse with the friendly shipping price. In addition, you can also buy from a local distributor, so you can get your BMW 3 Series E21 wheel spacers faster and save shipping costs. Click here to find Who sells wheel spacers near me.
5. Can my BMW 3 Series E21 320i 323i wheel spacers can be sent to my country and location?
The BONOSS BMW 3 Series E21 320i 323i wheel spacers you purchased can be shipped to most countries and regions around the world, through FedEx / DHL / UPS / TNT / EMS and other shipping channels, you don’t need to worry about it. However, a few remote carriers will charge special service fees (only in rare cases, we will contact you in advance if there are any). If you have any questions, please contact our customer service.
6. What should I do if there is a problem with the transportation of my BMW E21 320i 323i wheel spacers?
Each product from BONOSS will carry out good packaging to ensure that there will be no scratches during the shipping. In rare cases, due to the reasons of a third party, the items may be damaged, lost, delayed, etc. during the shipping. Once this happens, or if you encounter any problems during the delivery of your BMW 3 Series E21 wheel spacers, please contact us in time, and we will help you strive for the best benefits. Please note: In some cases, when BONOSS BMW 3 Series E21 wheel spacers arrive at your local delivery service point, you will be fully responsible for the return or damage of the package due to your failure to clear customs or sign for receipt in time.