Collection: Oversized Pulley Wheel System & Pulley Wheels

An Oversized Pulley Wheel system, also known as OSPW, is an upgrade to your rear derailleur that's all about one thing: reducing friction and maximizing efficiency. While traditional pulley wheels (derailleurs) are a standard size and often made of high-friction materials, OSPW systems offer larger wheels and low-friction bearings that provide a much more efficient line. This means you can save watts – and it's noticeable, especially over longer distances and at high intensity.

An Oversized Pulley Wheel system is not just for professionals. It's for anyone who wants to optimize their bike and get the most out of every single thread. At Transition Zone we stock market leading brands like CeramicSpeed and Split Second, both known for their technological precision and proven watt savings.

CeramicSpeed is arguably the most recognized name when it comes to OSPW systems. Every detail of their pulley wheels is designed with one purpose in mind: to minimize energy loss and maximize performance. Their systems use the absolute highest quality ceramic bearings and feature large wheels (typically 13/19 or 15/19 teeth) that reduce the angle of the chain and thus friction.

The result? Up to 2.4 watts of proven savings – a difference worth noting, whether you’re racing triathlons, time trials or long road trips. CeramicSpeed’s OSPW systems are hand-built in Denmark and are known for both durability and top-notch performance. It’s not just about the winch – it’s measurably better performance.

You'll find CeramicSpeed systems for both Shimano and SRAM groupsets at our Transition Zone. And we're of course happy to help you find the system that's right for your setup.

If you're looking for an OSPW solution that combines high quality with a sharper price, Split Second is a great choice. Their Oversized Pulley Wheel systems offer many of the same benefits as their more expensive competitors: larger wheels, efficient bearings, and significantly lower friction – but at a more accessible price.

Split Second is known for delivering great value for money, enabling more cyclists and triathletes to upgrade their drivetrain without breaking the bank. This makes them an obvious choice for serious exercisers and competitors who want to gain a technical edge – without compromising on quality.

Split Second systems are compatible with both electronic and mechanical groupsets and are available for the most popular configurations. Whether you ride Shimano or SRAM, you can find a Split Second OSPW system to suit your bike.

An Oversized Pulley wheel system is an obvious choice for anyone who focuses on efficiency, watt savings and technology. It is especially relevant for:

Triathletes, where every watt saved can be crucial over long distances.

Cyclists who want to optimize their equipment for both competition and training.

Tempo and time trial riders, where aerodynamics and friction play a big role.

Performance-oriented exercisers who just want the best out of their gear.

By switching to an OSPW system, you get a smoother gear shifting experience, less wear on the chain, and more watts directly into the pedals. It may sound like small margins, but it's these details that make the difference – especially when fatigue sets in and you need to put your technique to work for you.

At Transition Zone, we are ready to guide you in choosing OSPW – whether you are looking for top-tier solutions like CeramicSpeed or affordable alternatives like Split Second. We are specialists in triathlon and road cycling equipment, and we are happy to help you find the right upgrade to match your setup and ambition level.