Pro Circuit: motocross exhausts and parts with racing DNA

The Pro Circuit story begins with the workshop Mitch Payton opened in California in 1978. His first customers were desert and motocross riders looking for engine preparation suited to their bikes. That work led to the development of expansion pipes, silencers and components for different brands, building an identity rooted in race tracks and off-road motorcycling.

Racing is also part of that story. In 1991, Payton’s team competed in AMA Supercross with Honda and riders such as Jeremy McGrath; that year, it won both coastal titles in the 125 cc class. Today, the Pro Circuit catalogue at Motarea lets you explore that specialisation, from exhausts to controls, engine parts and branded clothing, always distinguishing the application of each part number.

Pro Circuit full exhaust systems, silencers and expansion pipes

The Pro Circuit full exhaust systems include T-4, T-6, Ti-6 and Ti-6 Pro references, as well as BC variants. The designation identifies the range; materials, configuration and supplied parts should be checked on the specific product page. To replace the final section, Pro Circuit silencers offer options such as 304 Factory Sound, R-304 Shorty, Ti-2 and T-6. Check the connections and the header or expansion pipe with which the selected silencer must be fitted.

For two-stroke engines, Pro Circuit 2T expansion pipes bring together the Works, Platinum and Platinum 2 families. Each expansion chamber is intended for a specific application: engine capacity, model and years are essential when comparing part numbers. To maintain the system, you will also find silencer end caps and exhaust inserts and spark arrestors. Their diameters, mounting points and intended range must match; approval and conditions of use relate to the individual product.

Controls, engine parts and components for your bike build

The selection of Pro Circuit levers and throttles combines brake and clutch levers with aluminium throttle tubes. It is complemented by gear shift levers in their own category. For engine work, the Pro Circuit engine and cooling section brings together ignition and clutch covers, oil filter covers, water pump kits, bolts and a cooling-system gasket. Check the contents and application before choosing a replacement part.

The Pro Circuit clutch spring kits have a dedicated link for comparing part numbers and checking the assembly they are intended for. The range also includes chain adjusters and suspension linkages. These components have different functions and fitting requirements; dimensions, mounting points and compatibility should be checked individually.

Pro Circuit clothing, caps and details for the paddock

The brand’s identity continues in Pro Circuit clothing and caps: T-shirts, sweatshirts and different styles of cap or beanie. Here, your choice depends on the size, design and features of each garment. Pro Circuit decals include replacements for silencers, fenders and forks, as well as sticker sheets and logos; check the shape, dimensions and intended surface.

You will also find Pro Circuit off-road bike stands and small workshop and fitting accessories. Explore the product families at Motarea to find anything from a full exhaust system to the replacement part your setup needs, using the part number and installation requirements as your buying guide.