XYZ Racing Circuit Master Coilovers — Mercedes-Benz A CLASS W177 A35 4WD φ55.5 (Modified Rear Integrated) 2019-2026

The W177 A35’s 4WD system shifts torque rearward under load, which means the rear axle is doing real work the moment you’re back on the throttle out of a slow corner. XYZ Racing’s Circuit Master coilover is built around that reality, giving the rear end a damper and spring package that stays composed while the front end is still settling from trail-braking.

This is the Circuit Master line, so the brief is sustained lap-time work rather than a single quick blast – repeated heat cycles, repeated compression events, and a chassis that needs to keep behaving the same way on lap fifteen as it did on lap one. For an A35 owner running track days, that’s the difference between a car that gets vague as the session wears on and one that doesn’t.

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

The φ55.5 monotube-diameter piston gives the damper more surface area to control oil flow, which on a car carrying 4WD hardware and its associated unsprung mass matters more than it would on a lighter, simpler chassis. With 9720 combinations across the 3 adjustment knobs, you can set compression and rebound independently front and rear – useful on the A35 specifically because the front and rear axles are managing very different loads (steering plus drive up front, pure drive plus damping duty at the rear). The modified, rear-integrated design keeps the rear geometry working with the standard multi-link mounting points rather than fighting them, so ride height and camber changes stay predictable as you adjust. Dial more compression into the rear and you’ll feel the squat under power tighten up; back off rebound and the front will settle faster after a kerb strike or bump on entry.

About the Circuit Master coilover

Circuit Master sits at the top of XYZ Racing’s range, built for cars doing repeated laps on circuits rather than the odd sprint or drag pass. The 3-knob adjustment layout routes oil through a deliberately narrow passage so the damper can offer that many discrete settings without the valve stack becoming unpredictable at the extremes – XYZ’s own racing teams have run this design internationally to validate it holds its damping curve under sustained heat. One side effect of that narrow-passage design: over sharp bumps you may hear a faint noise as oil moves through the small orifice. That’s the valve doing its job, not a fault, and it’s specifically tuned out for smooth circuit tarmac rather than broken B-roads. The kit is built and sold as a rear-integrated modification for the A35’s specific rear subframe layout, so the hardware bolts to the factory mounting points without requiring you to fabricate brackets.

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

This kit is built for the W177-generation A CLASS A35 4WD, chassis code ME51-1, covering model years 2019 through 2026. It’s specified for the φ55.5 modified, rear-integrated configuration, so confirm your car matches that rear-end spec before ordering – this is not the generic W177 A-Class fitment.

What buyers also search for

• Mercedes Benz A35 4WD coilover upgrade for track day and fast road use
• W177 A35 Circuit Master damping that holds its setting across repeat lap sessions
• Mercedes A Class ME51-1 rear-integrated suspension for the A35 4WD chassis
• A35 adjustable coilover kit with independent front/rear compression and rebound

Spec your φ55.5 Circuit Master for the A35’s ME51-1 chassis and configure yours below.