XYZ Racing Racing Spec Coilovers — Mercedes-Benz A CLASS W177 A25 4WD φ53 (Modified Rear Integrated) 2019-2026

The W177 A45 S’s 4MATIC+ system sends drive rearward under power, and AMG’s rear-biased torque vectoring only earns its keep if the rear axle stays composed while that torque shifts. The factory spring and damper on the A25 4WD ship as one integrated assembly, which is why this Racing Spec coilover is built as a Modified Rr Integrated fitment – a genuine two-piece spring-over-damper setup that replaces the factory unit rather than bolting around it.

Racing Spec sits at the top of XYZ’s range, built off direct participation in touring car racing rather than a fast-road remap of a lower-spec kit. For an A45 S doing serious track and time-attack days, that means damping calibrated for repeated hard stops and direction changes across a full session, not one clean lap.

What this coilover does for your 2019-2026 Mercedes Benz A CLASS W177

The M139 2.0-litre turbo four sits ahead of the front axle, so trail-braking into a corner loads the outside front damper hard before the AWD system has torque to redistribute. Racing Spec’s damping keeps that front corner settled through the transition instead of letting it dive and upset the rear’s torque-vectoring input. At the rear, the two-piece Modified Rr Integrated design gives you a spring rate and damping curve set independently of the front – important on a car where AMG’s Race and Drift modes deliberately shift bias rearward, since the rear axle needs to hold its geometry under that load rather than compress into the factory unit’s softer stock rates. Ride height adjusts through the coilover body, so you can drop the centre of gravity for track days and correct corner-weighting without touching spring rate.

About the Racing Spec coilover

Racing Spec is XYZ Racing’s circuit-focused damper line, with valving pulled from the team’s own race entries, including WTCC. Instead of a fixed curve borrowed from a fast-road kit, the settings come from actual competition use – repeated heavy braking, sustained lateral load, and the heat cycling a race weekend puts a damper through that a road kit never sees. For cars carrying aggressive factory upgrades or built to a full race specification, XYZ also runs a custom shock absorber service: supply details of the modified parts on the car and the circuit it will run, and the dampers get built around that specific setup rather than pulled from a standard catalogue. That is the level this line is aimed at – not a stiffened road coilover, but a damper specified the way a race team would spec one.

Fitment for the Mercedes Benz A CLASS W177 (2019-2026)

This kit is built for the W177-generation A-Class in A25 4WD guise – chassis code ME51-3 – across the 2019 to 2026 model years. It is specified as a Modified Rr Integrated fitment, meaning the rear coilover replaces the factory’s integrated multi-link spring/damper assembly rather than mounting alongside it, so confirm your car carries the 4MATIC+ multi-link rear before ordering.

What buyers also search for

• Mercedes A45 S W177 coilover setup for road and track use
• A-Class A25 4WD suspension upgrade with independently tunable rear damping
• Racing Spec coilover damping built to hold up across repeat track sessions
• W177 4MATIC+ ride height adjustment for circuit and time-attack days

This is a fitment-specific build for the ME51-3’s 4MATIC+ rear – configure your Racing Spec setup below.