Basic Carbon BMW 1 Series F20/F21 Gloss Black Performance Side Skirt Extensions (2015-2019) Fits M135i & M140i - Part BC99890

High-Gloss Sill Extensions for BMW 1 Series F20 F21 2015 to 2019 by Basic Carbon | Part BC99890

Give your 1 Series a sharper, lower visual stance with these sleek high-gloss black sill extensions from Basic Carbon. Tailored specifically for the BMW F20 and F21 hatchbacks, including the M135i and M140i, these side splitters transform the side profile with a purposeful, motorsport-inspired look that ties in perfectly with other black exterior accents and aero styling.

At MJ Modifications we have installed this setup on customer cars, and feedback has been consistently positive for the clean finish, snug fit and the way they make the body look wider and more aggressive without being over the top. If you are building an OEM-plus street car or a show-ready hatch, these glossy black rocker panel blades deliver instant curb appeal.

• Designed for BMW 1 Series F20 and F21 models, including M135i and M140i
• Deep, mirror-like black finish for a premium, M-inspired appearance
• Enhances the side silhouette with a lower, broader look
• Complements front lips, rear diffusers and roof spoilers in gloss black
• Chosen by MJ Modifications customers for quality, style and value

Vehicle Fitment

• BMW 1 Series F20 2015 to 2019
• BMW 1 Series F21 2015 to 2019
• Suitable for M135i and M140i variants

Part Number

BC99890

Brand

Basic Carbon

Warranty

2 year warranty provided by Basic Carbon

Fitting and Support

Want these installed professionally on your BMW 1 Series, M135i or M140i? Book with MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

Why Buy From Us

We specialise in BMW styling and performance upgrades, have hands-on experience with this exact set, and our customers love the immediate visual upgrade and consistent fit. Get the clean, glossy side profile your F20 or F21 deserves with these Basic Carbon sill extensions.

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