Performance M
Maxton Design RD Line 10mm Side Skirts/Side Splitters for BMW 1 Series F21 3-Door M135i M140i M Sport (2011-2019) - ABS Rocker Extensions/Sill Blades, M Performance Style Body Kit - Matte Black or Red Core
Maxton Design RD Line 10mm Side Skirts/Side Splitters for BMW 1 Series F21 3-Door M135i M140i M Sport (2011-2019) - ABS Rocker Extensions/Sill Blades, M Performance Style Body Kit - Matte Black or Red Core
Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.
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Maxton Design RD 10 mm ABS Rocker Extensions for BMW F21 1 Series 3 door M135i and M140i
Give your F21 hatchback a lower, wider stance with these premium sill extensions from Maxton Design. Built from chunky 10 mm ABS and finished in stealth matte or matte with a bold red core accent, these side blades add authentic track-inspired styling with everyday toughness. Perfect for 2011 to 2019 BMW 1 Series three door models with the M Sport package, including M135i and M140i.
Why you will love them
- Heavy duty 10 mm ABS construction for a solid, high quality feel
- Scratch and impact resistant surface designed for daily driving
- UV-stabilised finish to help resist fading in sunlight
- Weather and temperature resistant for year-round use in the UK
- Arrives vacuum sealed and film wrapped for protection in transit
- No paint required out of the box, simple bolt-on styling upgrade
- Genuine Maxton Design product with authenticity labels
- Material carries TÜV MATERIALGUTACHTEN certification
Included in the box
- Pair of Maxton Design side skirt extensions for the left and right
- Fitting hardware
Compatibility
Only suits:
- BMW 1 Series F21 3-door with M Sport styling, M135i and M140i, model years 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019
Finish options
- 10 mm matte black
- 10 mm matte black with red core accent
Our experience
We have fitted these in-house and the fitment is spot on with a sturdy, premium feel. Customers consistently praise the clean lines, the way they tie in with the factory M Sport skirts, and how well they match other Maxton aero like front splitters and rear diffusers.
Installation and care
Professional fitting recommended. For hassle-free installation, book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.
If you choose to paint the product, always apply a suitable primer first.
Search-friendly terms
BMW F21 side splitters, 1 Series rocker extensions, sill blades, side skirt add ons, ground effects kit, aero side skirts, BMW 1er 3 door styling, M Performance style side skirts, M Pack body kit parts, exterior tuning, UK BMW aero upgrades, Maxton RD line, thick ABS side skirts, matte black side blades, red accent core skirts, BMW hatchback side extensions, direct fit rocker panels, bolt-on side skirts, BMW 1 Series 2011 to 2019 body styling, genuine Maxton Design UK.
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