We use cookies to make your experience better. To comply with the new e-Privacy directive, we need to ask for your consent to set the cookies. Learn more.
ProX Racing Parts OEM-passform, testad i tävling
Kamkedjor och vevpartidelar i OEM-kvalitet för cross och enduro
01Founded 1975
02Based near Amsterdam
03Manufactured largely in Japan
04OEM-spec engine parts
05Motocross and enduro four-strokes
ProX Racing Parts Motocross · Enduro
ProX Racing Parts has done one thing since 1975: build replacement engine parts in the same factories that supply the major motorcycle brands, then sell them at prices that leave room in the race budget. The company sits just outside Amsterdam, the manufacturing happens largely in Japan, and the thinking is pure rider logic - more hours on track and trail, fewer on the workbench.
In the Knobby range, ProX focuses on the heart of the four-stroke engine, with the cam chain leading the way. A worn cam chain is the quiet killer of a four-stroke: it stretches, it rattles, and it lets valve timing drift exactly when you are pinned in fifth. The ProX cam chain is built in Japan by BorgWarner, a genuine OEM supplier, with heat-treated pins that hold their length long after cheaper chains have given up.
Around that core sits the rest of the crank zone - the internal engine hardware you reach for at rebuild time. When the rebuild comes for your motocross or enduro engine, you fit the part the factory would have chosen, set the tension, button it up and get back out there.
Frequently asked questions about ProX Racing Parts
Does ProX suit both motocross and enduro?
Yes. ProX makes OEM-spec engine internals for four-stroke motocross and enduro machines alike, since both share the same core mechanical needs. The cam chain and crank-zone parts are matched to the original factory specification for your specific model, so the right part depends on your engine rather than on the discipline you ride.
Why does a worn cam chain matter so much?
A four-stroke cam chain controls valve timing, and as it stretches that timing drifts, which costs power and can eventually cause real engine damage. Replacing it during a rebuild is cheap insurance. The ProX cam chain is made in Japan by BorgWarner, an OEM supplier, with heat-treated pins that resist stretch far longer than budget alternatives.
How do I buy ProX via Knobby?
Knobby sells through dealers, not directly to consumers. Your local dealer can order from the full ProX range and will confirm the exact part for your engine, along with sizes, current stock and prices. Bring your bike's model and year, and the dealer matches the correct cam chain or engine component to your specific machine.
