Dinan 15.8mm Rear Anti-Roll Bar for BMW 128i / 135i / 325i / 328i / 335i 2006-2013

Dinan's 15.8 mm rear anti-roll bar (D120-0507) replaces the soft factory rear bar on E82 1 Series and E90/E92/E93 3 Series cars so the chassis stays flatter in a corner. Factory bars on these cars are tuned for comfort and a dose of understeer. The stiffer Dinan bar cuts body roll and that built-in understeer, which Dinan describes as more mechanical grip and a more planted feel at the limit. It can be added on its own or as a later piece of a staged Dinan suspension build.

How much stiffer the bar feels depends on what came on the car. Against the common 13 mm factory rear bar, Dinan rates the 15.8 mm bar 118% stiffer; that is the figure for E90 325i, 328i, 330i, and 335i cars and for E92 328i, 335i, and 335is cars. E93 328i cars left the factory with either a 13 mm bar or a 15 mm sport bar, so the gain is either 118% or 23%. E93 335is and E90/E92 335xi cars use a 15 mm factory bar (+23%). E82 135i cars use an 11 mm or 12 mm factory bar (+326% or +201%), and the E82 128i uses a 12 mm bar (+201%).

Dinan titles the bar for 2006-2013 BMW 128i, 135i, 325i, 328i, and 335i cars on the E82, E90, E92, and E93 chassis. The US table below follows that list, including the 2006 330i, 335is, and 335xi rows Dinan names in the stiffness notes, then cuts each body to its US years. The bar is not compatible with 328xi / 328i xDrive cars. On rear-wheel-drive cars, Dinan says the matching 28 mm front bar (D120-0530) should be installed as well for proper balance when the car has a limited-slip differential or rear tires that are 20 mm or more wider than the fronts. Later F30 3 Series and F80 M3 cars use different bars.

Labor is listed at 4.2 hours. Emission code 6 applies. Published shipping size is 51.5 x 15.7 x 3.3 inches at 11.1 pounds. Coverage follows Dinan's standard limited warranty: the remainder of the vehicle factory limited warranty (up to 4 years / 50,000 miles) or 2 years / unlimited miles, whichever is greater. The later DNN-prefixed listing shares this part number and redirects here.

Features

• 15.8 mm rear anti-roll bar for E82 1 Series and E90/E92/E93 3 Series cars
• Up to 118% stiffer than a 13 mm factory rear bar; gain varies by the stock bar size listed above
• Reduces body roll and understeer for more mechanical grip
• Not compatible with 328xi / 328i xDrive; pair with D120-0530 on RWD cars that need the matching front bar

What's Included

• Dinan 15.8mm Rear Anti-Roll Bar (D120-0507)

Specifications

Questions about fitment? Call (310) 231-0292 or text (310) 886-3111.

Fitment Notes

• Rear anti-roll bar for the E82/E90/E92/E93 models listed below. Years are the US ranges.
• Not compatible with 328xi / 328i xDrive vehicles.
• On RWD cars, Dinan specifies the matching D120-0530 28 mm front bar for proper balance when the car has a limited-slip differential or rear tires 20 mm or more wider than the fronts.
• Not for later F30 3 Series or F80 M3.