Drawer Runners as Replacement for IKEA Stuva: Installing Full Extension and Soft-Close

A full extension runner opens 100%, whereas a single extension runner exposes only around 75% of the drawer contents due to its design. Anyone upgrading the well-known IKEA Stuva furniture system (or similar ranges) faces precisely this technical switch. The originally installed fittings are usually simple roller runners with partial extension. Upgrading to ball bearing runners with an integrated self-closing mechanism and soft-close significantly enhances everyday usability.

Upgrading drawer runners is like replacing the suspension on a car: the external look of the cabinet remains entirely intact, but the internal mechanics run noticeably smoother, safer, and more precisely after the conversion. This guide explains the technical prerequisites, the exact dimensions, and the procedure for retrofitting standard drawers with a modern runner system.

Key Buying Criteria for Replacement Runners

When replacing hardware in flat-pack furniture, tolerances must be adhered to precisely. Choosing the correct runner determines whether the drawer will jam later or run smoothly.

1. Nominal Length and Carcass Depth

The nominal length of the runner must match the depth of the drawer box. It must not be longer than the internal cabinet depth of the unit. For standard children's bedroom or hallway furniture with an external depth of 50 cm, drawer runners 450 mm or drawer runners 500 mm are typically used. Measure the outer edge of the wooden drawer side from the back panel to the inside edge of the front panel.

2. Installation Clearance (Side Clearance)

This is the most critical dimension when retrofitting. The installation clearance describes the gap between the internal cabinet wall and the outside of the drawer.

• A classic roller runner often requires 12.5 mm of space per side.
• A standard ball bearing runner requires exactly 12.7 mm (equivalent to 1/2 inch) installation clearance.

If the gap on the existing furniture piece is smaller, a ball bearing runner cannot be mounted without routing the drawer sides. If the gap is between 12.5 mm and 13.0 mm, the replacement usually works smoothly, as the runners can compensate for minor tolerances.

3. Load Capacity

The dynamic load capacity indicates the weight the runners can hold permanently when fully extended. For light clothing, standard runners with 25 kg to 30 kg are sufficient. If heavy books, tools, or solid wooden toys are stored in the boxes, heavy-duty drawer runners with a capacity of 45 kg or more should be selected.

Overview of Types and Options

The furniture fittings market offers various mechanical concepts. For retrofitting existing units, two main designs are relevant.

Roller Runners

The roller runner is the basic model that is often installed as standard from the factory. A plastic roller runs along an epoxy-coated steel rail. It usually provides only a partial extension. The advantage lies in its straightforward installation, as the runner is simply screwed beneath the drawer base. If you only want a direct 1:1 replacement for a defective original fitting, choose roller drawer runners.

Ball Bearing Runners

The ball bearing runner is a telescopic system. Multiple steel balls housed in ball cages ensure play-free and quiet movement. This design allows for a full extension and is screwed to the side of the drawer box. It is the top choice for functional upgrades. If you want a complete view of the drawer contents, opt for full extension drawer runners.

Undermount Runners

An undermount runner is concealed beneath the drawer box. It offers excellent running performance. However, retrofitting existing IKEA drawers is often complex. The drawer box requires specific cut-outs and a precisely defined base thickness (usually a maximum of 16 mm) for the locking clips to engage. For brand new custom builds, undermount drawer runners represent the most elegant technical solution.

Which System for Which Application? (Decision Guide)

In addition to the design type, additional mechanisms define the convenience of the drawer. Fitters must choose one system, as these mechanisms are mutually exclusive.

• If the drawer needs to close quietly: Choose a model with soft-close damping. A spring mechanism catches the momentum over the final centimetres and pulls the drawer shut gently and silently. This protects the material and prevents pinched fingers. Suitable models can be found under soft-close drawer runners.
• If handleless fronts are planned: Choose push-to-open (tip-on). Pressing the front panel triggers a spring that ejects the drawer box slightly. Important: Soft-close and push-to-open are mechanical opposites. A runner that actively pulls the drawer shut cannot simultaneously eject it when pressed. For handleless designs, use push to open drawer runners.

Installation Guide: Converting Stuva to Full Extension

Switching from a side roller runner to a telescopic ball bearing runner requires clean workmanship and precise marking.

Required Tools:

• Pozi screwdriver or cordless drill (drive PZ2)
• Tape measure or folding rule
• Pencil
• Bradawl
• Matching chipboard screws (typically 3.5 x 16 mm or 4 x 16 mm countersunk)

Step-by-Step Instructions:

1. Dismantling: Remove the drawer and unscrew the old runners from both the cabinet and the drawer box.
2. Separating the Runners: A ball bearing runner consists of a cabinet profile and a drawer profile. Extend the runner fully. Inside, there is a small plastic release lever. Press this to pull out the inner profile completely.
3. Mounting the Drawer Profile: Screw the slim inner profile centrally or along the lower third of the drawer side. Ensure that the runner sits flush with the front edge of the drawer box (behind the front panel).
4. Aligning the Cabinet Profile: Transfer the height of the mounted runner to the inside of the cabinet carcass. Many industrially manufactured units utilise System 32 (rows of holes spaced 32 mm apart). Check whether the system drillings on the new runner match the existing holes in the carcass. If not, mark a horizontal line and use the bradawl to pilot the new fixing points.
5. Fixing the Cabinet Profile: Secure the outer runner inside the cabinet. Ensure the correct setback depth so that the front panel sits flush with the carcass when closed.
6. Insertion: Guide the drawer with the mounted inner profiles carefully into the ball cages of the cabinet profiles. Push the drawer in with gentle, even pressure until the release levers audibly click into place.

FAQ – Frequently Asked Questions About the Conversion

Can I convert every IKEA drawer to full extension? A conversion is possible if the installation clearance (the gap between the drawer and the cabinet wall) is exactly 12.7 mm per side. If the gap is narrower, a standard ball bearing runner will not fit.

What is the difference between full extension and partial extension? A partial extension leaves part of the drawer inside the carcass, typically around a quarter of its depth. A full extension bridges the entire installation depth via a three-part telescopic system. The drawer box can be pulled out 100% clear of the cabinet.

Why is my new soft-close runner stiff to close the first time? After initial installation, the soft-close damper pin must first engage with the mechanism. Push the drawer firmly once until it stops completely. After that, the soft-close mechanism is synchronised and operates smoothly.

Which screws do I need for the runners? Use chipboard screws with a diameter of 3.5 mm or 4 mm and a length of 15 mm to 16 mm. The countersunk head must sit completely flush inside the runner mounting holes, otherwise the ball cage will rub against the screw heads during operation.

Can I combine soft-close and push-to-open? No, these are opposing mechanical principles. A self-closing mechanism actively pulls the drawer shut and holds it closed. A push-to-open system requires a spring to push the drawer outwards upon pressure. You must choose one of these two features.