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November 6, 2020

Pro Circuit Polo Shirt

Another Option has Been Added to the Arsenal of Casual Wear


CORONA, CA - November 6, 2020 - A newly released apparel item from Pro Circuit, the popular polo shirt has recently undergone a change in its color and a new graphic has been embroidered onto the front left chest and right sleeve. Simple and stylish, our comfortable polyester polo is just right for breathing new life into your office look or your race track attire. Grab a polo shirt and show your support for one of the legendary brands in the motocross world.

Pro Circuit. We Race.

November 5, 2020

2021 KX250/450 Linkage System

Better Handling and Performance for the Newer KX Four-Stroke Models 


CORONA, CA - November 5, 2020 - Pro Circuit is excited to release a new linkage system for the 2021 KX250 and 2019-2021 KX450 that brings the bike's handling performance to an entirely new level. The stock OEM linkage system for these newer models tends to be harsh and stiff at the beginning of the stroke and gets softer as the rear wheel goes deeper into the stroke. With our new linkage system, it's the complete opposite. The Pro Circuit KX250/KX450 linkage system is plusher at the beginning and stiffens up as the rear wheel goes deeper into the stroke. This adjustment lessens the need for stiffer high-speed valving, which can cause the rear to feel harsh and deflective. A considerable amount of research and testing for this new linkage system has resulted in a more true-to-weight spring rate to reach the ultimate sweet spot in handling for your new KX250/KX450. Ultimately, the new linkage creates a plush feel while increasing traction.

Note: An increase in spring rate is required. Usually a 0.2 kg/mm rate increase is recommended (Rate example: 5.4 goes to 5.6).


Pro Circuit. We Race.



All products manufactured and/or distributed by Pro Circuit Products, Inc. are offered and designed for use with standard machines. Pro Circuit Products, Inc. makes no claims as to the products effectiveness on modified machines. Pro Circuit Products, Inc. is the sole determiner of abuse, misuse, installation errors and modifications. We assume no liability for any errors in listings, specifications, part numbers, prices or model applications. Pro Circuit Products, Inc. reserves the right to change specifications, product descriptions, product quality, pricing and model applications at any time without prior oral or written notice and without further obligation.

Adding new components to your motorcycle (especially to the engine, suspension or braking system) may radically alter the acceleration, deceleration, handling and braking characteristics of your motorcycle. Ensure that all parts are installed and properly torqued per the instructions supplied with the part or to the motorcycle manufacturer's original specifications. Test the motorcycle with the new part(s) on level ground, at low speed, without any other vehicles or obstacles nearby, to ensure that it is working properly. Periodically recheck, adjust or replace the parts as may be necessary depending upon the terrain, use, mileage and rider input. Consult the instructions supplied with the part, or the motorcycle manufacturer's original specifications for further details. The failure to properly install, maintain, or familiarize yourself with the new part's use, and proper operation, may result in damage to the motorcycle, and/or a loss of control, resulting in serious injury or death. Buyers assume all risk for any and all damage caused to themselves, a third party and/or property by virtue of failure of these products. By installing and/or using a Pro Circuit Products, Inc. product, you hereby accept and understand these stated terms and conditions.


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