Dinan Supplemental Ride Quality & Handling Kit, Set of 4 - BMW G20 330i / M340i / G22 M440i xDrive (2019-2026)
SaleYou lowered your BMW on Dinan springs because you wanted it to sit right and turn in harder. Then you hit the first expansion joint and felt the suspension slam into the stops. That is not the springs. That is the factory bump stops, sized for stock ride height, engaging far too early on a lowered car.
The Dinan Supplemental Ride Quality & Handling Kit fixes it with four progressive-rate bump stops tuned specifically for Dinan Performance Spring Sets on the BMW G20 330i and M340i, G22 M440i xDrive, G42 M240i xDrive, G01 X3 M40i, G02 X4 M40i and F95 X5M / F96 X6M. They give back the suspension travel you lost when you dropped the car, so it stops bottoming out and rides the way it should.
Why the Ride Quality and Handling Kit Matters on a Lowered BMW
Lowering a car shortens the distance between the bump stop and its contact point. Stock stops then hit sooner and harder. Dinan's stops are made from OE quality material with progressive characteristics, so they maximize usable travel at the lower ride height and come in smoothly instead of abruptly.
There is a handling payoff too. Dinan tunes the bump stops to work with the spring rate, so they add progressive support as the car loads up in a corner for more mechanical grip. That is why Dinan says its Performance Spring Sets should be bought and installed together with this kit, and why skipping it voids Dinan warranty claims related to handling and ride quality.
Install the Handling Kit with Your Dinan Springs
If you install this kit at the same time as your Dinan springs, the added labor is negligible because the struts are already apart. Installed on its own later, Dinan rates it at 7.8 to 11 hours depending on the car. It is a suspension part with no effect on emissions and no tune or coding. Dinan part number D193-0121. Sold by AutoTecknic, an authorized Dinan dealer.
What's Included
- 4 Dinan progressive-rate bump stops
Key Features
- Progressive-rate bump stops tuned for Dinan Performance Spring Sets
- Maximizes suspension travel at lowered ride height
- Stops the harsh bottoming out common on lowered cars with stock stops
- Adds progressive support in corners for more mechanical grip
- OE quality material for consistent, predictable behavior
- Required by Dinan for full spring warranty coverage on handling and ride quality
Vehicle Fitment
Fits the following BMW models when paired with the matching Dinan Performance Spring Set:
- BMW 3 Series / G20 Sedan (2019-2026): 330i, 330i xDrive
- BMW 3 Series / G20 Sedan (2020-2026): M340i, M340i xDrive
- BMW 4 Series / G22 Coupe (2021-2026): M440i xDrive
- BMW 2 Series / G42 Coupe (2022-2026): M240i xDrive
- BMW X3 / G01 (2018-2024): X3 M40i
- BMW X4 / G02 (2019-2025): X4 M40i
- BMW X5M / F95 and X6M / F96 (2020-2026): X5M, X6M
Not for the M440i RWD or the M240i RWD.
Installation Notes
Best done at the same time as your Dinan springs, while the strut assemblies are already off the car. Follow the Dinan instructions included with your spring set and this kit.
- Raise and safely support the car and remove the strut and spring assemblies following BMW procedure.
- Disassemble each strut with a proper spring compressor and remove the factory bump stop.
- Install the Dinan bump stop and reassemble the strut with the Dinan spring.
- Reinstall the assemblies and torque all fasteners to BMW specification.
- Have a wheel alignment performed after lowering.
