Euro 5+ for motorcycles - Everything you need to know at a glance

The Euro 5+ standard will be mandatory for motorcycles from 2025. This further development builds on the Euro 5 specifications introduced in 2020 and introduces stricter rules for exhaust gas monitoring and the durability of systems such as catalytic converters. The objective: lower emissions in the long term and more sustainable use of technology. But how exactly do these changes affect us drivers? What is behind the regulations and what should you be prepared for? Here are the most important facts and background information.

Euro 5+ - Why an extension of the existing standard?

The development from Euro 4 to Euro 5 and now to Euro 5+

Since 1999, the EU has been pursuing the goal of reducing pollutant emissions from vehicles with the so-called Euro standards. For motorcycles, Euro 4 (from 2016) was a major step forward with significantly stricter limits for nitrogen oxides (NOx) and carbon monoxide (CO). Euro 5, which was introduced in 2020, continued these requirements, with even stricter limits for all types of emissions.

Euro 5+ goes one step further: instead of just limiting emissions, the technology is being scrutinized. Do exhaust gas purification systems really last the entire service life of a motorcycle? How can we ensure that the limit values are also complied with in real driving conditions?

This is where Euro 5+ comes in - with stricter test procedures and extended monitoring of emission-related systems.

The three central innovations of Euro 5+

1. Onboard diagnostics II (OBD II)

Motorcycles must be equipped with a more advanced onboard diagnostics system that continuously monitors the function of exhaust-related components. This allows problems such as a defective catalytic converter to be detected at an early stage. The driver is informed of malfunctions before higher emissions occur.

2. Long-term durability of exhaust gas purification systems

Manufacturers must prove that catalytic converters and other exhaust-relevant components function over the entire service life of a motorcycle - not only on the test bench, but also in real driving conditions.

3. More realistic noise tests

The limit values for riding noise remain at 77 dB(A), but the test methods are adapted to better reflect real riding situations. The aim is to ensure that motorcycles remain quiet in everyday use - without losing the character of a bike.

What does Euro 5+ actually mean for motorcyclists?

Purchasing decisions - what's in store for you?

- New acquisitions: Motorcycles that are newly registered from 2025 must meet the Euro 5+ standard. For us riders, this means more modern technology, but also potentially higher acquisition costs.

- Existing vehicles: Models registered before 2025 are not affected by the new regulations. You can therefore continue to ride your current motorcycle without any restrictions.

Technology and maintenance - what's changing

The more advanced exhaust systems and the new OBD II could ensure that maintenance becomes more precise, but also more expensive. Repair costs could rise, especially in the event of catalytic converter or sensor defects. On the positive side, such problems are detected early by the diagnostic system, which can prevent consequential damage.

Dr. Jekill & Mr. Hyde - Innovation meets new standards

A good example of how manufacturers are responding to emissions regulations is Dr. Jekill & Mr. Hyde. They are known for their electronically adjustable exhaust systems, which both meet the legal requirements and keep driving fun.

For Euro 5, for example, they have developed an O₂ sensor extender that sits between the body and the end cap of the system and continuously monitors the exhaust gas values. This ensures that the regulations are complied with without losing the typical sound.

It is to be expected that they will again develop solutions for Euro 5+, or have already done so. At the European Bike Week, Dr. Jekill & Mr. Hyde presented initial insights into their new approaches to how modern exhaust systems can meet the stricter requirements without compromising on quality or ride feel. Technologies were presented that not only meet the strict requirements of the Euro 5+ standard, but also simulate real-world driving to ensure maximum reliability and efficiency.

Particularly impressive was the use of their Sabina test robot, which simulates riding under realistic conditions to test the systems for durability and efficiency. At the same time, the company emphasized that they do not lose sight of the requirements of their customers - especially those who continue to expect the characteristic sound and special riding experience of a Harley-Davidson.

This balance between legal requirements and driver expectations impressively demonstrates how technological innovation and the preservation of tradition can go hand in hand.

What the future holds - the outlook for Euro 6

Euro 5+ is not the end of the road. There are already discussions about the introduction of Euro 6, which may come in 2028. This could bring further tightening of emissions and driving noise. There are also issues such as the electrification of motorcycles and safety requirements (e.g. mandatory ABS for light motorcycles).

For us drivers, the question remains: how can we maintain the balance between driving pleasure and regulation? It is clear that the coming years will be exciting - both in technical terms and for the market.

Summary: What you need to know now

- Euro 5+ will apply to all new registrations from 2025.

The standard extends the existing Euro 5 specifications with stricter tests and monitoring.

- Existing vehicles are not affected.

You can continue to ride your current bike as usual.

New vehicles without Euro 5+

New vehicles without Euro 5+ should still be registered in 2024, if at all, it will be very difficult to get your vehicle registered. Dealers will have to work with one-day registrations. There are limited exceptions for manufacturers if they carry over stock into the new year. If the manufacturer itself carries out a one-day registration, the vehicle is still considered a new vehicle for the current year, according to my information. This means that it will still be possible to buy a Sport Glide in 2025, for example. Contrary to previous information, there will still be Sport Glide and Fat Bob models in 2025.

- The new systems offer advantages, but also bring challenges.

Advanced exhaust technology ensures cleaner values and lower emissions, but could make maintenance more complex.

- The future remains in motion.

Euro 6 and electrification could further change the market. Anyone planning a new motorcycle should keep an eye on developments.

Harleysite. Compiled to the best of our knowledge. This is a very complex subject and despite careful research, errors cannot be ruled out.