Bilstein B12, B14 Or B16: Which Suspension Adjustment Do You Need?
Bilstein, series by series
Three Bilstein kits can go on the same car and do three quite different jobs. The badge on the box is not the thing to start from. What you can still change after it is bolted on is.
Cameron puts it as one question on the phone: once this is fitted, what do you want to be able to alter. Nothing, and a B12 is the honest answer. The ride height, and that is a B14. The damping as well, and you are into B16. Garreth adds the part nobody enjoys hearing, which is that the part number decides the rest, not the series.
Below is what each family actually gives you, the checks that stop the wrong kit arriving, and the listings we hold for each one.
- B12 Pro-Kit and Sportline are fixed lowering: Bilstein dampers matched to Eibach springs
- B14 adds threaded ride height adjustment within the range approved for your car
- B16 PSS9 and PSS10 add nine or ten manual damping settings on top of that
- On a B16 the adjuster moves rebound and compression together, not separately
- DampTronic is for specified original electronic damping cars only, not every B16
- A figure such as 30 to 40mm is the approximate lowering, not an adjustment range
- Axle ratings and original suspension type are part of the application, not small print
Start with the adjustment, not the badge
Every one of these is a Bilstein damper and every one of them lowers the car. The difference is what you can still change afterwards, and that is worth settling before you look at a single part number.
| Series | What you can set | What is fixed | Suits |
|---|---|---|---|
| B12 Pro-Kit and Sportline | Nothing after fitting | Ride height and damping, both set by the kit | A suspension refresh where the specified drop is the drop you want |
| B14 | Ride height, within the approved range | Damping | Getting the stance right without a damping dial to think about |
| B16 PSS9 and PSS10 | Ride height, plus nine or ten damping settings | Rebound and compression move together, not separately | A car that gets set up, not just lowered |
| B16 DampTronic | Ride height, with the factory damping control retained | Restricted to specified original electronic damping applications | Cars that left the factory with electronic damping |
Four columns, and the second one is the question. Answer that and the shortlist looks after itself.
B12 Pro-Kit and Sportline: a matched package
B12 combines Bilstein dampers with matched Eibach springs in one box. It suits a suspension refresh where you want the specified lowering and have no interest in threaded spring seats. Both halves are chosen to work together, which is most of the appeal.
Choosing between Pro-Kit and Sportline is done on the figures for your exact car, not on the family name. A headline that covers a whole range cannot tell you the front and rear drop, the axle limits or the original suspension restrictions of one particular kit. Two kits for the same shell can differ on all three.
Four out of the forty one B12 listings we hold, to show the spread. The full range is on the Bilstein B12 category page.
B14: choose where the car sits
B14 puts threaded ride height adjustment on a fixed damping kit. The adjustment range is specific to the vehicle, so the front and rear limits are worth comparing before you commit. It is the sensible pick when the stance matters to you and a damping dial does not.
The Clio IV is the example Cameron reaches for, because it shows that the original chassis changes the answer. B14 kit 47-286832 lists roughly 20 to 40mm front and rear on the RS chassis, and 5 to 25mm on the specified RS Cup sports chassis applications. Same kit, same car on the V5, different numbers. Read the entry that matches the car rather than taking the largest figure on the page.
B16: check the system, not just the name
B16 PSS9 and PSS10 give nine and ten manual damping settings respectively, alongside the ride height adjustment. Rebound and compression change together through one control, which keeps the setup honest and also means the setting you leave it on matters.
Garreth is blunt about this one. If nobody is going to touch the dial after the first week, the money is better spent elsewhere. If the car gets used in more than one way, being able to firm it up and soften it off is exactly what you are paying for.
The whole shelf is on the B14 and B16 category pages, and the wider suspension section covers the rest of what we hold.
Four checks before you order
- Application. Chassis, body style, engine, drivetrain and any gearbox restriction, all together and not one at a time
- Axle ratings. Compare the stated limits against the vehicle identification plate, front and rear separately
- Original suspension. Sports suspension, self levelling and electronic damping are all distinguished in the listings, and they are not interchangeable
- Lowering. Read the front and rear figures separately, including any axle the kit leaves at its original height
The plate, not the brochure
Axle ratings are stamped on the vehicle identification plate. A kit that suits the model and exceeds the plate is still the wrong kit.
Ask about lead time first
Suspension kits move on supplier lead times, not shelf stock in a warehouse. Ask before you book the car in, not after.
Line up the alignment
Lowering a car changes its geometry. Book the alignment as part of the job so the tyres are not paying for it three months later.
Common questions
Can I adjust the ride height on a B12 kit?
No. B12 Pro-Kit and Sportline are fixed lowering packages. The drop is whatever the kit gives on your application. If you want to choose the height, that is a B14 or a B16.
What is the difference between Pro-Kit and Sportline?
They are two different B12 specifications, and the figures that matter are the ones for your exact car: front and rear drop, axle limits and any original suspension restriction. Compare the two listings for your application, not the family names.
Does PSS10 mean ten times more adjustment than PSS9?
No. It means ten damping settings instead of nine. On both, the control moves rebound and compression together, so you are choosing a position on one scale, not tuning two things independently.
My car has electronic damping from the factory. Which kit do I need?
That is the DampTronic question, and it is answered per part number, never per series at all. Send us the registration or VIN and we will check for a specified application for your car.
Why do two kits for the same car list different axle ratings?
Because the application is narrower than the model. Engine, body style, gearbox and original suspension all change the permitted axle loads, which is exactly why two listings that look alike are not interchangeable.
Will lowering the car need an alignment afterwards?
Yes. Any change in ride height changes the geometry, so have the alignment checked once the kit is fitted and settled. Follow the installation and approval documents supplied with the exact part number as well.
Where we would start
Most people who ring up asking for coilovers want a B12 and have not been told that. They want the car to sit better and drive better, and they are never going to wind a spring seat. A matched package does that job properly and costs less.
If the height genuinely matters, whether that is wheel fitment or corner weights or simply getting it exactly where you want it, go to B14. Go to B16 when the car has more than one job and somebody is actually going to use the adjustment.
Whichever one it is, the part number carries the fitment. Send us the registration or VIN, the original suspension details and the number you are looking at, and we will check it against the application before you order.
Manufacturer references: Bilstein B12, Bilstein B14 and Bilstein B16.
Give us the number and the registration and we will confirm the application, the axle limits and the original suspension restriction before anything is ordered.
Send the registration or VIN, what the car is on now and what you want to be able to alter once it is fitted. We will check the application and the current supplier lead time with you before anything is ordered, which is a much cheaper conversation than the one after a kit turns up that does not fit.
