1. What are the size of Mercedes Benz R-Class W251 spacers?
Bolt Pattern (PCD):5×112, Center Bore (CB):66.5, Thread: M14x1.5
For more detail, please click Are these wheel spacers compatible with my vehicle.
2. What are the benefits of BONOSS Mercedes Benz W251 wheel spacers?
After installing W251 wheel spacers, the wheel track can be increased, making driving more stable and comfortable. Besides, the roll angle when turning can be reduced, which is making vehicle handling safer. The R-Class W251 spacers can push the wheels out suitably so that the wheels are flush with the fenders, the appearance of the vehicle can be fuller and more attractive. At the same time, the problem of wheel adapters and the clash between wheel and brakes can be solved. BONOSS has the world’s first active cooling technique, and the rotation of spacer makes the external cold airflow efficiently and continuously inside the spacer, while cold air flowing, the heat of the braking system is taken away, achieving the effect of active cooling, and improve braking efficiency and drive safer.
3. How does the active cooling technique of R-Class W251 spacers work? Why it is a breakthrough for traditional spacers?
The back of W251 spacers has specially petal shape grooves. Because the rotation of the spacer makes the external cold airflow efficiently and continuously inside the spacer, while cold air flowing, the heat of the braking system is taken away, thereby achieving the effect of active cooling, improving braking efficiency, and reducing overheating of brakes. This technique maintains the brakes at normal temperature to ensure wheel spacers’ safety and driving security. For a long time, the function of the wheel spacers for cars is single. As a professional spacer designer and manufacturer, BONOSS relies on years of experience and hard work to create the world’s first active cooling technique, diversifying spacers’ functions and increasing the value. On top of that, the production cost of the active cooling technique is almost the same as traditional spacers. So that customers scarcely need to pay extra for this. It is precisely having more functions, higher performance, and more friendly wheel spacers prices that have become the choice of many customers. For more detail, please click BONOSS Active Cooling Wheel Spacers Benefits.
4. Are W251 wheel spacers safe?
In fact, wheel spacers good or bad determines the safety of spacers, and the same as wheels, wheel brakes, and body kits, there are only quality products that can ensure driving safety. Therefore, if the high-quality Mercedes Benz W251 spacers are installed correctly, the spacers are safe. Safety and quality are always the focus of BONOSS, that is the reason why BONOSS wheel spacers use forged aluminum alloy material, taking AL6061-T6 as an example, its tensile strength ≥ 310Mpa. Also, precise 0.02mm CNC machining makes the wheel spacer fit better with the wheel hub assembly and wheel, and the matching BONOSS wheel studs and lug nuts passed the SGS and TUV test. The matching BONOSS wheel studs comply with ISO standard grade 12.9, taking M14x1.5 wheel studs as an example, the tensile strength ≥ 1268Mpa, and the matching lug nuts comply with ISO standard grade 10. Compared with cheap cast wheels, R-Class W251 wheel spacers have higher safety, higher performance, more professional design, and a better installation experience. Precisely because BONOSS believes that more professional production can provide customers with more value. For more detail, please click Are Wheel Spacers Good or Bad.
5. Why do the W251 wheel spacers need hub-centric?
Installing the W251 hub-centric wheel spacers can provide higher stability. Mercedes Benz R-Class W251 spacers have a multi-stage hub-centric design, this design allows the spacers to be more fit on the wheel hub assembly and wheels, thereby reducing high-speed vehicle vibration. Compared with common, the multi-stage hub-centric design of BONOSS makes the installation more fitting and safer, and the W251 spacers can also be wheel adapted with different data, providing vehicle owners with more choices. For more detail, please click Why do You Need Wheel Spacers with Hub Centric Rings.
6. What are BONOSS W251 spacers make of? How do they stand out from the common?
BONOSS Mercedes Benz W251 spacers are all forged, the manufacturing process of forged makes the internal structure of the spacer denser and firmer. Meanwhile, the material used is aluminum alloy, and it has many outstanding characteristics, such as high strength, wear resistance, excellent toughness, impact resistance, and high-temperature resistance. This metal has good mechanical properties and taking AL6061-T6 as an example, its tensile strength ≥ 310Mpa, yield strength ≥ 275Mpa, and failure elongation ≈ 10%. Compared with industry standards, the cheap spacers which using low-quality materials are not strong enough and will deform and endanger driving safety under strong impact. In contrast, BONOSS insists on producing professional R-Class W251 wheel spacers far higher than the industry’s safety and professional standards. For more detail, please click How to Choose Safe Wheel Spacers.
7. What is the performance of the wheel studs and lug nuts in W251 spacers? Why does each have the BONOSS Logo?
The BONOSS wheel studs and lug nuts passed the SGS and TUV tests. The matching wheel studs applied JIS SCM440 steel material, and it has many desirable properties such as high strength, wear-resistance, excellent toughness, and impact resistance. It also has good ductility and high-temperature stress resistance, structural stability, low harmful elements, few surface defects, and more advantages. Besides, it has achieved ISO standard grade 12.9, taking M14x1.5 as an example, its tensile strength ≥ 1220Mpa, ultimate tensile load ≥ 152000N, hardness (HV) ≥ 395, NSS ≥ 500H… The matching lug nuts applied 40Cr material, by continuous forging process, they have achieved ISO standard grade 10, and its proof load ≥ 1110Mpa, hardness (HV) ≥ 349… They can easily withstand hundreds of strong shocks for normal driving and are sufficient to cope with intense racing competitions. This excellent performance stems from BONOSS’s professional and dedicated attitude, as evidenced by the BONOSS Logo on each product. BONOSS insists on producing professional Mercedes Benz W251 wheel spacers far higher than the industry’s safety and professional standards. For more detail, please click How to Improve Wheel Spacer Safety.
8. Can I customize Mercedes Benz R-Class W251 spacers with special thicknesses and data? Can it be customized within 3 days?
BONOSS has an independent OEM factory, so customized W251 wheel spacers can be completed within 1-3 days at the fastest. Besides, BONOSS provides OEM/ODM too. If you need W251 wheel spacers with special thickness or bolt pattern conversion to install the wheels with different data, the BONOSS custom spacer is your best choice. BONOSS provides customized services of special thickness, the thinnest thickness is 0.1″(3mm), the thickest thickness is 6.4″ (160mm). Our customized PCD conversion wheel adapters have many choices, such as 5×112 to 5×114.3 adapters, 5 lugs to 6 lugs adapters, 5×112 to 5×120 adapters. So that the thread size, thickness, and bolt patterns can be customized according to your exact requirements on all-wheel adapters. For more detail, please click BONOSS Custom Wheel Spacers Service.
9. Why do BONOSS Mercedes Benz R-Class W251 wheel spacers have SGS and TUV test reports?
That’s not only for getting the trust of customers, this is also BONOSS’s confidence in product quality. In fact, BONOSS has completely passed more than 66 ISO standards SGS, TÜV authoritative tests, and achieved excellent results. BONOSS matching wheel studs have passed SGS 2,000,000 times the limited life test, without damage. Taking M14x1.5 wheel studs as an example, tensile strength ≥ 1,220Mpa, ultimate tensile load ≥ 152,000N, hardness (HV) ≥ 395, NSS ≥ 500H… Through these authoritative test reports, BONOSS truly achieves the quality and professionalism expressed, in the form of data, which truly guarantees safety. BONOSS believes that high standards of quality management and authoritative certification reports are the best way to meet customer and regulatory requirements. For more detail, please click BONOSS Wheel Spacers Quality Certificated.
10. What are the benefits of the knurling design of Mercedes Benz R-Class W251 wheel spacers?
The knurling design can expand the side that can heat dissipation contact area to contact more external cold air, enhance the heat dissipation effect, and reduce the internal stress of machining. Besides, upgrading the performance, strength, and durability of the wheel spacers. On the other hand, adding the knurling design on the side enhance the aesthetics of the Mercedes Benz W251 wheel spacers. BONOSS aims to provide more additional functions for the W251 spacers and make the spacers become safer higher performance and have a better installation experience. This is the reason why BONOSS insists on independent manufacturing and continuous optimization of a design. In addition to practical functions, there is a sense of art. For more detail, please click Are Wheel Spacers A Good Idea.
11. What is the difference in vehicle handling experience after installing BONOSS R-Class W251 spacers?
After Installing Mercedes Benz W251 wheel spacers, that can push the wheel rims and tires out slightly, thereby increasing the wheel track and the vehicle handling will become more stable. Most track and field racing cars pursue the highest performance and the best appearance, and the wider track means better traction, thereby increasing the vehicle control experience, providing better turning performance and more stable driving. The gap in the fender’s plate can be filled and get an outstanding appearance with BONOSS R-Class W251 spacers, and the tolerance of the BONOSS spacer is 0.02mm, which is more suitable for the wheel. Not only reducing the vehicle vibration at high speed but also providing a smoother driving experience. For more detail, please click Wheel Spacer Handling Improvement.
12. What kind of Mercedes W251 spacers should I choose to fit other brand wheel rims such as BBS wheel rims, Vossen wheel rims, OZ wheel rims?
Mercedes W251 wheel spacers, wheel studs, and lug nuts are equally important to the wheel. An excessive positive offset will cause friction between the inner side of the rims and the suspension components. In this case, installing wheel spacers can provide the clearance required to avoid friction between the inner side of the rims and the suspension assembly, and correct the deviation by pushing away from the rims. Mercedes Benz W251 Wheel spacers can also be used to adapter the car’s pattern and center bore diameter. In this way, aftermarket rims with different data can be installed. For example, BBS wheel rims, AMG wheel rims, AEZ wheel rims, Antera wheel rims, OZ wheel rims, and Vossen wheel rims. Compared with those cheap cast spacers, BONOSS Mercedes W251 spacers are safer and more professional. For more detail, please click When to Use Wheel Spacers for Aftermarket Wheels.
13. How do I choose Mercedes Benz W251 spacers for avoiding the problem after installing Prior Design brakes, AP Racing brakes, Brembo brakes, or other brands?
High-performance brake kits are usually larger than car parts, and the caliper usually cannot be accommodated in the original rim space. A suitable gap can be obtained by replacing a larger rim and avoiding friction between the rim and the brake caliper. If you have installed a larger brake caliper and want to fix the current wheel on the vehicle without scratching, installing the Mercedes W251 spacers will be the most cost-effective solution. Mercedes W251 wheel spacers can be adapted to Brembo wheel brakes, AP Racing wheel brakes, Prior Design wheel brakes, EBC wheel brakes, Endless wheel brakes, and Alcon wheel brakes. Compared with those cheap cast spacers, BONOSS Mercedes Benz W251 spacers are safer and more professional. For more detail, please click When to Use Wheel Spacers for Big Brake Kit.
14. What kind of Mercedes Benz W251 spacers do I choose to fit the body kit or aero kits?
Usually, wide-body kits including the upgrades of larger-size wheels and bigger brake kits, and the Mercedes Benz W251 spacers allow adding larger wheels and larger brakes. This is a very safe upgrade if you are going to drive a wide-body car on the track. Installing spacers is the simplest and most effective modification to low the chassis, widen the wheel track and make the wheels flush with the fenders. Mercedes Benz W251 wheel spacers can be matched with AMG wide-body kit, Brabus wide-body kit, Carlsson wide-body kit, Liberty Walk wide-body kit, and Hamann wide-body kit. BONOSS Mercedes Benz W251 wheel spacers have 25mm-60mm thick for choosing. For more detail, please click When to Use Wheel Spacers for Wide-body Kit.
15. How to choose Mercedes Benz W251 wheel adapters for installing Audi wheels, BMW wheels, Porsche wheels, or other else?
For the same wheel bolt pattern, we can customize a 3mm to 160mm wheel adapter to fit the wheel, and what you will need to do is check the thickness you need and contact us. In some sense, the Mercedes Benz R-Class W251 wheel adapters also play the role of wheel spacers increasing the wheel track. Because wheel adapter can push the wheel outward too, and make the wheel flush with the fender. At the same time, it can also be used to solve the gap issue of brakes, tie rods, and other suspension parts. Compared with spacers, Mercedes Benz W251 wheel adapters can change the PCD and the center bore diameter so that you can install wheels with different data. In brief, installing wheel adapters make the vehicle obtain better turning performance, a smoother driving experience, and a fuller appearance. For more detail, please click Do you need wheel spacers or wheel adapters.
16. How to measure and determine the thickness of the W251 spacers?
Using a straight edge or metal rule, place the straight edge on the outermost part of the rims where the wheel comes closest to the fender. Then this distance is the thickness that can achieve the look that flushes or nearly flushes with the fender. But if the wheel spacers are too thin, rims or caliper will still have interference. On the opposite, the tires will hit the fenders. So, using suitable size spacers not only ensure safety but also avoid breaking local laws and regulations. At present, BONOSS R-Class W251 spacers have a thickness of 25mm-60mm for choosing. For more detail, please click How to Measure Wheel Spacers for My Vehicle.
17. How to install Mercedes Benz W251 wheel spacers?
Installing Mercedes Benz W251 wheel spacers is very easy, please click How to Put Spacers on Wheels to get the correct installation steps.
18. Where can I buy W251 spacers near me?
You can place an order directly here, or click this link to view the dealer near you to make a purchase. For more detail, please click Wheel Spacers Near Me.
1. Which express will deliver my Mercedes Benz W251 spacers? How much does the shipping cost? Does it include import tax?
After placing the order, BONOSS’s shipping department will give priority to choose FEDEX, DHL, TNT, UPS, EMS, or other express delivery for you, and then deliver your Mercedes Benz W251 spacers as soon as possible. The shipping cost calculation is based on the shipping weight and volume and doesn’t including import tax. Also, the special service fees in remote areas are not included but will be charged in rare cases. If this happens, we will contact you in advance.
2. How soon will my Mercedes Benz W251 wheel spacers ship?
Generally, existing Mercedes Benz W251 spacers are ship within 24-48 hours, and the customized spacers are ship in about 3 days (some special custom orders or models may take longer). Once your Mercedes Benz W251 spacers are shipped, we will provide you the tracking number by email. Please pay attention that if you have not received the tracking number or have other questions, please contact our friendly customer service staff.
3. How soon can my Mercedes Benz W251 spacers arrive?
The general time is 3-7days, but may be affected by aviation, weather, politics, customs clearance, or other factors. But don’t worry, because it usually doesn’t take long, and we will follow up the whole process so that your Mercedes Benz W251 wheel spacers can arrive faster.
4. Where is my Mercedes Benz W251 wheel spacer shipping address?
BONOSS has a lot of multiple distribution centers around the world, and we will give priority to choose the warehouse nearest to your delivery address or the most price-friendly area. But we recommend that purchasing from a local dealer to get your Mercedes Benz W251 spacers faster and save shipping costs. Click here to find Who sells wheel spacers near me.
5. Can I receive my BONOSS Mercedes Benz W251 spacers in my country and location?
In fact, through FedEx / DHL / UPS / TNT / EMS and other shipping channels, BONOSS Mercedes Benz W251 spacers can be shipped to most countries and regions in the world, so you don’t need to worry about it. But a few remote carriers will charge special service fees in rare cases. If this happens, we will contact you in advance. If you have any questions, please contact our friendly customer service staff.
6. What should I do if my Mercedes Benz W251 spacers encountered problems during shipping?
In rare cases, due to the reasons of a third party, the product may be damaged, lost, delayed, etc. during ship. Once this happens, or if you encounter any problems during the delivery of your Mercedes Benz W251 spacers, please contact us and we will help you strive for the best benefits.
Please attention: In some cases, when BONOSS Mercedes Benz W251 wheel spacers arrive at your local delivery place, and you will bear all responsibilities if the product is returned or destroyed due to your failure to clear customs or sign for receipt in time.