BMW E30 / E36 / E46 - Roll-center / bump steer / angle -kit

  • €352,00
    Unit price per 
(Excl. VAT)
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RODOBAL rod end / spherical bearing upgrade (service) available for this kit, click here

Roll-center / bump steer / angle -kit for BMW E30 / E36 / E36 M3 / Z3 / Z3M / E46 / E46 M3 / Z4 / Z4M models (excluding E30 M3 / E30 iX / E46 xi/xd models)

Latest Gen 3.5 kit main features:

  • 30mm roll-center correction

  • 30mm bump steer correction

  • 30% quicker steering ratio (around 1 less turn on the steering wheel)

  • All new one-piece fasteners and billet castle nuts with PVD coating

  • More steering angle

  • Original Ackerman angle for multi-purpose use (proven to work in Street, Circuit, Rally, AutoX, drifting -applications)

  • Compatible with original tie rods (cutting of the threads might be required for spindle/knuckle clearance * and sufficient toe-in adjustment)

  • Please refer to wheel fitment chart and check compatibility with your wheel/knuckle combination

  • Control arm bore needs to be tapped for bearing retainer insert on E30 M3 "Dorman" and E46 M3 control arms, thread tool included **

  • Steering rack stops recommended

  • Control arms and/or tie rods shown in the pictures not included

  • Comes with mounting hardware and of course MRT Engineering decals

Why do you need one?

When lowering your car (BMW E30 / E36 / E46) the front end geometry goes wrong. The main purpose of the kit is to correct these geometry issues.
The steering adapter changes control arm pivot point vertical distance by 30mm correcting the roll-center and camber curve.
Tie rod end pivot point is also changed by 30mm in vertical direction which corrects the bump steer curve, the pivot point is additionally moved closer to the control arm pivot point changing the lever ratio which gives you quick steering ratio and allows more steering angle.

Does it fit my car?

The kit can be combined with most of the E30 / E36 / E46 control arms, knuckles/spindles and tie rods. See available variations:

Outer joint size:

  • 32mm (E30 M3 "Dorman") thread tool included **
  • 41mm (E30 non-M, E36 M3, Z3M)
  • 48.5mm (E36 / Z3 non-M, E46 / Z4 non-M aftermarket, E46 M-Sport / Z4M)
  • 33mm (E46 M3) thread tool included **
  • E30 non-M *
  • E36 / Z3 non-M
  • E36 M3 3.0 *
  • E36 M3 3.2 / Z3M *
  • E46 / Z4 non-M / Z4M
  • E46 M3

Is it easy to install?

Instructions, PDF

Assembly drawing, PDF

The kit comes with instructions, if you know how to change a control arm or an outer joint, installing this kit is basically not any harder. You'll need a press for removing the old outer joint and installing the new outer joint, no other special tools needed.

If you need any further info please contact us!

How about the lifetime and service of the kit?

The kits have been proven on street and track applications by hundreds of our customers. We're constantly doing R&D to make the kits even better, all improvements are based on customer feedback which is very important to us.
We have proven the very same bearings with no maintenance for 20,000 kilometers, through the year, in daily use without signs of excessive wear. When the bearing life comes to an end, they're easily replaceable! Bearings are available around the world from automotive and industrial dealers and any of the spare parts can be also bought separately from us.

We want to keep our customers 100% happy thus we're only using the best materials and manufacturing processes available. All parts are CNC machined: aluminum parts are aerospace grade AW-7075 with hard anodized finish (silver and black), mounting studs are made of highest quality CrMo tool steel and small spacers/adapters used on the kits are 316L stainless steel.

We use DHL Express shipping for all items. Please find your order tracking information from DHL website.