Dinan Adjustable Front and Rear Sway Bar Set - BMW G8x M2 / M3 / M4 2021-2026

Dinan sizes and valves each anti-roll bar to a specific chassis rather than selling one bar across a range, and this set pairs a 28 mm front bar against the 23.5 mm factory item with a 26 mm rear against the stock 21.9 mm. That works out to 18% more front stiffness and 35% to 48% more at the rear, which keeps the body far closer to level while still allowing enough roll for the tyres to load progressively. Both bars are tubular high tensile alloy steel, hollow for strength without the weight of a solid bar, and the rear is two hole adjustable so the balance can be tuned for road or track. Polyurethane bushings and grease are in the box.

Specifications

Documents: Installation Instructions (PDF)

This part fits:

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy