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Bilstein B12 (Sportline) 46-278708 product image 1
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Bilstein

Bilstein B12 (Sportline) Suspension Kit 46-278708

SKU: 46-278708
Barcode: 651860814261

$999.00

Bilstein B12 (Sportline) Suspension Kit 46-278708

Matched dampers and springs sharpen fixed-height control
Bilstein B12 (Sportline) Suspension Kit 46-278708

Sportline springs create a lower, more aggressive stance
Bilstein B12 (Sportline) Suspension Kit 46-278708

Progressive spring characteristics improve response and ride balance
Bilstein B12 (Sportline) Suspension Kit 46-278708

Monotube dampers maintain consistent suspension behavior

Verified U.S. Supplier

Fitment Data Included

30-Day Returns
In stock

Warranty

Products sold by Modridge may be covered by the original manufacturer’s warranty, when applicable. Warranty terms, coverage, exclusions, and claim requirements vary by brand and product line.

If you believe your item has a manufacturer defect, contact us with your order number, product photos, and a description of the issue. We’ll help review the case and guide you through the next steps based on the manufacturer’s policy.

This warranty does not cover normal wear, improper installation, misuse, modification, racing damage, accident damage, or installation-related issues unless the manufacturer’s policy states otherwise.

Shipping & Returns

Shipping

This item ships from an authorized U.S. distributor. Processing and transit times may vary depending on stock availability and destination. Most orders ship within 1–3 business days.

Returns

Returns are accepted within 30 days of delivery. Items must be uninstalled, unused, and in original packaging. Programmers and calibration devices that have been paired to a vehicle are not eligible for return. See our Returns & Refunds page for full details.

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WARNING: Cancer & Reproductive Harm - www.P65Warnings.ca.gov

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Emissions Compliance Exempt
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Bilstein B12 (Sportline) Suspension Kit 46-278708

$999.00

$999.00

30-40 mm

Lowering

Yellow

Dampers

Red

Springs

Product Description

Bilstein B12 (Sportline) is a complete fixed-height suspension kit for drivers who want a lower stance with sharper road feel and matched damping. It pairs Bilstein Performance dampers with Eibach Sportline springs, creating a coordinated package instead of mixing springs and dampers from separate setups.

The kit focuses on direct response, dynamic driving, and a sportier look, with progressive Sportline spring characteristics matched to Bilstein monotube dampers. This makes it a cleaner option for an aggressive street stance where ride control, visual drop, and component compatibility all need to work together in one suspension package.

Lowering is application-specific rather than one fixed value across every vehicle. For this SKU, the fitment data lists 30-40 mm front lowering and 30 mm rear lowering.

Specifications

Brand
Bilstein
Part Number
46-278708
Series
B12 (Sportline)
Product Type
Suspension Kit
Position
Front and Rear
Lowering Range
30-40 mm
Internal Design
Monotube
Damper Finish
Yellow
Spring Finish
Red
Warranty
Limited Lifetime
Country of Origin
DE
Quantity per Application
1 Each
GTIN
651860814261
Package Length
30.3 in
Package Width
11 in
Package Height
11.8 in
Package Weight
35.6 lbs

Fitment / Application

2017 | Mazda | MX-5 Miata | Sport | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2017 | Mazda | MX-5 Miata | Grand Touring | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2017 | Mazda | MX-5 Miata | Club | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2017 | Fiat | 124 Spider | Lusso | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2017 | Fiat | 124 Spider | Classica | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2017 | Fiat | 124 Spider | Abarth | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2018 | Fiat | 124 Spider | Lusso | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2018 | Fiat | 124 Spider | Classica | Front and Rear | Rear Lowered Height: 30mm up to 665kg Axle Load; Front Lowered Height: 30-40mm up to 695kg Axle Load
2018 | Fiat | 124 Spider | Abarth | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2018 | Mazda | MX-5 Miata | Sport | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2018 | Mazda | MX-5 Miata | Grand Touring | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2018 | Mazda | MX-5 Miata | Club | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2019 | Fiat | 124 Spider | Urbana | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2019 | Fiat | 124 Spider | Lusso | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2019 | Fiat | 124 Spider | Classica | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2019 | Fiat | 124 Spider | Abarth | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2019 | Mazda | MX-5 Miata | Sport | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2019 | Mazda | MX-5 Miata | Grand Touring | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2019 | Mazda | MX-5 Miata | Club | Front and Rear | Rear Lowered Height: 30mm up to 665kg Axle Load; Front Lowered Height: 30-40mm up to 695kg Axle Load
2020 | Mazda | MX-5 Miata | Sport | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2020 | Mazda | MX-5 Miata | RF Grand Touring | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2020 | Mazda | MX-5 Miata | RF Club | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2020 | Mazda | MX-5 Miata | RF 100th Anniversary Special Edition | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2020 | Mazda | MX-5 Miata | Grand Touring | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2020 | Mazda | MX-5 Miata | Club | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2020 | Mazda | MX-5 Miata | 100th Anniversary Special Edition | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2020 | Fiat | 124 Spider | Urbana | Front and Rear | Rear Lowered Height: 30mm up to 665kg Axle Load; Front Lowered Height: 30-40mm up to 695kg Axle Load
2020 | Fiat | 124 Spider | Lusso | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2020 | Fiat | 124 Spider | Classica | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2020 | Fiat | 124 Spider | Abarth | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2021 | Mazda | MX-5 Miata | Sport | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2021 | Mazda | MX-5 Miata | RF Grand Touring | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2021 | Mazda | MX-5 Miata | RF Club | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2021 | Mazda | MX-5 Miata | Grand Touring | Front and Rear | Rear Lowered Height: 30mm up to 665kg Axle Load; Front Lowered Height: 30-40mm up to 695kg Axle Load
2021 | Mazda | MX-5 Miata | Club | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2022 | Mazda | MX-5 Miata | Sport | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2022 | Mazda | MX-5 Miata | RF Grand Touring | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2022 | Mazda | MX-5 Miata | RF Club | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2022 | Mazda | MX-5 Miata | Grand Touring | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2022 | Mazda | MX-5 Miata | Club | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2023 | Mazda | MX-5 Miata | Sport | Front and Rear | Rear Lowered Height: 30mm up to 665kg Axle Load; Front Lowered Height: 30-40mm up to 695kg Axle Load
2023 | Mazda | MX-5 Miata | RF Grand Touring | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2023 | Mazda | MX-5 Miata | RF Club | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2023 | Mazda | MX-5 Miata | Grand Touring | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2023 | Mazda | MX-5 Miata | Club | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2024 | Mazda | MX-5 Miata | Sport | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2024 | Mazda | MX-5 Miata | RF Grand Touring | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2024 | Mazda | MX-5 Miata | RF Club | Front and Rear | Rear Lowered Height: 30mm up to 665kg Axle Load; Front Lowered Height: 30-40mm up to 695kg Axle Load
2016 | Mazda | MX-5 Miata | Sport | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2016 | Mazda | MX-5 Miata | Grand Touring | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2016 | Mazda | MX-5 Miata | Club | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2024 | Mazda | MX-5 Miata | Grand Touring | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2024 | Mazda | MX-5 Miata | Club | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2025 | Mazda | MX-5 Miata | Sport | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2025 | Mazda | MX-5 Miata | RF Grand Touring | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2025 | Mazda | MX-5 Miata | RF Club | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2025 | Mazda | MX-5 Miata | Grand Touring | Front and Rear | Rear Lowered Height: 30mm up to 665kg Axle Load; Front Lowered Height: 30-40mm up to 695kg Axle Load
2025 | Mazda | MX-5 Miata | Club | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load
2025 | Mazda | MX-5 Miata | 35th Anniversary | Front and Rear | Front Lowered Height: 30-40mm up to 695kg Axle Load; Rear Lowered Height: 30mm up to 665kg Axle Load

What's in the Box

• Bilstein Performance dampers × 1 set
• Eibach Sportline springs × 1 set

Installation & Documents

Review the installation guide before starting. Perform a professional alignment after installation. Confirm suspension clearance and hardware torque through the full range of travel.

Installation Guide
SDS / Safety Document
Warranty Document