Losi JRX2 Rear Upright (5-Link) (2)

JRX2 Rear Upright (5-Link)
Part No: JCS-0171

Overview
A unique and hard-to-find rear shock upright specifically for the 5-link trailing arm suspension used on the Losi JRX2 platform. Ideal for restorations or period-correct builds.

Key Features

• High-quality injection-moulded nylon construction
• Made in the U.K.
• Utilising original geometry
• Direct-fit solution for JRX2 5-link rear suspension setups

What’s Included

• (2) Rear uprights

Ideal For

• Vintage JRX restorations
• Maintaining correct rear suspension geometry with modern spring options

Losi Release History

JRX2

Release Date: 1988

Key Features

• Graphite chassis
• 5-link rear suspension
• Real rubber tyres
• Low rotating mass transmission

Notes

The buggy that started it all for Team Losi. The JRX2 introduced an innovative 5-link rear suspension, setting it apart from competitors at the time.

Unlike the Associated RC10, which featured a stamped aluminium chassis, the JRX2 was supplied with a graphite plate chassis, highlighting Losi’s early focus on performance and lightweight design.

This original platform went on to form the basis for three additional buggy variants and three trucks, establishing the foundation of the Losi racing lineup.

JRX2-Pro

Release Date: 1990

Key Features

• Longer graphite chassis
• H-arm rear suspension
• Long front and rear shocks

Notes

The JRX2-Pro was the direct evolution of the JRX2. It introduced longer front shocks, a design direction that was later reversed in subsequent models.

The original 5-link rear suspension was replaced with a solid H-arm, improving durability and consistency. Additional updates included a revised two-piece battery holder, stronger steering bellcranks, and a move from spoked wheels to solid wheels featuring the Team Losi logo.

JRX2-Pro SE

Release Date: 1992

Key Features

• Molded composite chassis
• Revised shock towers
• Slipper transmission
• Swept front suspension arms

Notes

The JRX2-Pro SE built upon the Pro platform with significant updates. Most notably, it introduced new swept composite front arms, improved shock towers, and a slipper transmission.

Later versions were also supplied with the retrofit XX transmission. The molded composite chassis offered two wheelbase options and should not be confused with the Junior 2 chassis—it is a different composite design with additional rear mounting holes to accommodate the extended wheelbase.

This model also featured revised shock cartridges, further improving suspension performance.

Junior 2

Release Date: 1990

Key Features

• Molded composite chassis
• Plastic shock towers
• Bushings in place of bearings

Notes

The Junior 2 was Team Losi’s first lower-cost buggy kit, designed to make competitive RC racing more accessible.

It introduced Losi’s first molded plastic chassis, replacing the flat graphite plates used in earlier models. Cost savings were achieved through the use of plastic shock towers, bushings instead of full bearings, and simple threaded-rod linkages.