BMW 1 Series Coilover Suspension Kit - Front + Rear - AST - 5100 Street Series, 1-Way Adjustable, Monotube, Inverted - 2015–2019. A vehicle-specific coilover kit designed to give the BMW 1 Series a more controlled, tunable ride for street use while retaining a familiar rear setup.

This AST 5100 Street Series kit pairs inverted monotube front coilovers with a divorced, OEM-style rear damper arrangement and fixed-rate rear springs. The monotube design uses a larger piston to improve rebound control and reduce aeration for more consistent damping response. Ride height is adjustable and rebound is user-tunable via a 12-position knob, allowing drivers to dial in handling balance and ride quality without complex setup. Dampers are rebuildable at authorized AST service centers, and the kit is supplied to run with OEM top mounts for a straightforward fitment.

Features

• Monotube inverted front dampers with coilovers
• Divorced rear setup with vehicle-specific fixed rear spring rates
• 1-way (rebound) adjustable with 12-position knob
• Adjustable ride height; springs included to use OEM top mounts
• Rebuildable at certified AST service centers
• Fits BMW 1 Series (F20/F21) 2015–2019

If you have questions or want advice on fitment and setup, call us directly — we’re happy to help. We have two installation and customization locations: Austin, Texas and the Los Angeles, California area where we offer on-site installation and tuning. Call Austin: 512-982-9393 (TX) or Los Angeles area: 562-981-6800 (CA). If you’re considering purchasing multiple items, contact us for shipping discounts. We install on premises at both locations.

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