UMI Performance A225-650R Coilover Adjustable Spring Lowering Kit with 650lb Springs

The UMI Performance A225-650R front coilover kit combines Viking's high-quality hybrid coil springs with 19-position double adjustable shocks for complete suspension control. This kit includes two front coilover shocks with 650lb spring rate, ideal for small block and big block handling applications and autocross use, allowing up to 2 inches of ride height lowering.

Key Features:

• 19-way adjustable compression and rebound damping with 361 possible tuning combinations
• 650lb spring rate optimized for handling and autocross performance
• Bearing mounted bottom for maximum reliability and performance in racing applications
• Hybrid coil springs made in the USA with protective finish
• Upper coil fits factory spring perch while lower coil matches shock bottom
• Each shock built, dyno tested, and serialized in Lakeville, Minnesota
• Adjustable ride height from factory to 3 inches lowered with optional spanner wrench
• No coil spring compressor required for installation

Spring Rate Options Available:

• 250lb: Drag race only with serious weight reduction
• 350lb: Small block cruise or drag race applications
• 450lb: Small block cruise, big block drag race
• 550lb: Small block handling, all big blocks except drag (up to 2" lowering)
• 650lb: Small block and big block handling, autocross (up to 2" lowering)

Optional Accessories:

• Spanner Wrench & Thrust Bearing Kit: Allows height adjustment while shock remains mounted; thrust bearing enables easier spring seat rotation during adjustments
• Bearing vs. Polyurethane Mounts: Mild street applications can use polyurethane for comfort, while corner carving, drag racing, autocross, and road race should choose bearing ends for increased reliability

This coilover system works perfectly with UMI's lower a-arms or factory lower a-arms. Pair with UMI's geometry-corrected upper a-arms loaded with tall ball joints for optimal suspension geometry. Shocks can be rebuilt at Viking or authorized Viking rebuild centers. The independent compression and rebound adjusters allow custom tuning for street, strip, autocross, and road race applications all in one versatile shock package.