How to properly sharpen ski edges

Before beginning the actual processing, one should understand the basic terms related to ski edges.

When talking about ski edges, we refer to:

Side Edge

The side edge largely determines edge grip.

The more aggressive the chosen angle, the more directly the ski grips on hard snow.

and the:

Base Edge (Bevel Edge)

The base edge primarily influences:

• Turn initiation
• Forgiveness
• Handling characteristics

For most racing applications, a base edge angle of 0.5° has proven effective.

and the:

Sidewall

The sidewall is located directly above the steel edge.

Before material can be removed from the edge, the sidewall often needs to be reset, and the Titanal and plastic removed.

For most racing applications, we recommend:

Base edge: 0.5°

Side edge: 87°

This combination offers:

• excellent edge grip
• precise turn initiation
• high running smoothness
• versatile applications

It is used by many racers in slalom, giant slalom, and technical racing.

Precise grinding starts with a stable workstation.

The ski must be:

• securely clamped
• vibration-free
• easily accessible

Good lighting significantly facilitates edge inspection.

Edge Angle and Sidewall Cutters

Edge tools ensure exact angles and reproducible processing.

They form the basis of every professional edge preparation.

Files

The file is responsible for the actual material removal. Only with a high-quality file can precise angles and clean edges be created.

Diamond Files

Diamond files are used for fine finishing. They remove burrs and polish edges.

The base edge significantly influences the skiing experience.

For race skis, a base edge of:

0.5°

has proven effective.

This setting ensures:

• fast turn initiation
• direct edge grip
• precise control

The base edge should be changed as rarely as possible, as corrections are time-consuming and costly in terms of material. It is important that the base edge has no damage. The base edge should be measured regularly, as the angle can change for various reasons, for example, due to the flexing and twisting of the skis while skiing, or due to damage, or due to ski preparation.

All race skis have thick sidewalls made of Titanal, plastic or composite material.

These often lie flush with the edge, preventing the file from working cleanly.

Before starting the actual edge tuning, it must therefore be checked whether the sidewall offers sufficient clearance.

Why is this important?

If the sidewall is not set back:

• the file will jam on the plastic and get clogged.
• the edge will not be fully processed
• the angle will change unintentionally

The result is uneven edges and poor edge grip.

Check the Sidewall

Check along the entire edge:

• Is plastic overlapping the steel edge?
• Does the file touch the sidewall?
• Are there grinding marks visible?

If so, the sidewall should be set back.

See below for how the sidewall should be prepared.

Carefully remove material

When resetting, the following applies:

• remove only as much as necessary
• work evenly
• do not create nicks

The goal is to make the steel edge fully accessible.

After the sidewall has been prepared, the actual edge tuning begins.

For most racing applications, a side edge angle of 87° is used.

This angle offers:

• high edge grip
• direct power transmission
• precise handling

Correct Use of the File

The file is inserted into the edge tool.

Important:

• clean contact surface
• correct direction
• clamp at a slight angle, both ends of the file should run over the edge
• secure guidance

A dirty or damaged file should not be used.

The file is guided with steady, even strokes.

The following applies:

• even, light pressure
• not too fast
• no jerky movements
• process the entire edge length

Many small, clean strokes lead to significantly better results than a few aggressive movements.

After a few strokes, the edge should be checked.

Pay attention to:

• uniform surface
• continuous grind
• no more damage
• burr formation

The less material removed, the longer the edge will last.

Why 87°?

Many racers wonder why 87° is often used as the standard.

The advantage lies in the balance between:

• maximum edge grip
• sufficient durability
• controllable handling

While a more aggressive angle can generate even more grip, it often leads to higher wear and more challenging handling.

For most racing applications, 87° therefore represents an excellent compromise.

After filing, the edge is sharp but not yet fully prepared. Material removal creates fine metal burrs and microscopic imperfections that can impair edge grip.

This is precisely where diamond files come in.

In professional race service, polishing the edge is one of the most important steps.

Why polish?

Polishing provides:

• smoother edge surfaces
• less friction
• better edge grip
• longer durability
• easier turn transitions

A cleanly polished edge feels significantly smoother and more precise than a purely filed edge.

How to polish correctly

Guide the diamond file with light pressure.

Important:

• even movements
• light pressure
• work the entire edge length

Diamond files should not cut, but polish.

Too much pressure worsens the result.

Use the diamond file one to two passes per edge to polish the surface and remove burrs.

After filing and polishing, remaining burrs must be removed.

Burrs are caused by:

• Material removal
• Stone contact
• Ice
• Artificial snow

Even the smallest burrs can cause the ski to:

• run erratically
• grip unevenly
• turn poorly

Deburring the Shovel and Ski Tail

In race service, the shovel and ski tail are often lightly deburred.

This results in:

• smoother turn initiation
• calmer handling
• improved forgiveness

The actual race edge, of course, remains completely sharp.

The requirements for the edge differ depending on the discipline.

Slalom

Typically:

• 0.2 to 0.5° base edge
• 87° to 85° side edge

Maximum grip for quick changes of direction.

Giant Slalom

Typically:

• 0.5° base edge
• 87° side edge

Optimal combination of precision and smooth running.

Super-G

Typically:

• 0.5° to 0.7° base edge
• 87° side edge

Slightly higher stability at high speeds.

Downhill

Typically:

• 0.7° to 1.4° base edge
• 87° side edge

High running smoothness and controllable handling.

Too Much Pressure

Many skiers believe that more pressure automatically leads to sharper edges.

The opposite is true.

Too much pressure:

• creates uneven edges
• stresses the file
• reduces precision

If the file no longer cuts easily, it is worn out!

Diamond file used too frequently

Often, one or two passes with a normal fine file are enough.

Repeated polishing with the diamond file makes the edge surface finer and finer, and the edge can no longer grip optimally on hard surfaces.

Incorrect Angles

Different angles on the left and right skis lead to:

• asymmetrical ski behavior
• imprecise edge grip
• poor control

Therefore, angles should always be precisely maintained.

Professional tools are particularly important. If the file cannot be optimally clamped and has play in the angle, or if the angle's support surface is not exact and stable, good results cannot be achieved.

Sometimes, regular resharpening is no longer sufficient.

Typical reasons:

• the base edge angle is no longer correct or is uneven
• stone damage
• hard spots in the edge
• rust damage
• uneven angles

In these cases, a professional service or machine sharpening can be useful.

Afterward, regular maintenance can be done by hand again.

Many skiers treat edge service and ski wax as separate issues.

In fact, both areas influence each other.

Perfect performance is only achieved through the combination of:

• sharp edges
• suitable ski wax
• clean base structure
• correct application

A perfect edge is of little use if the base is dry or poorly waxed.

Likewise, even the best race wax cannot compensate for dull edges.

Professional race preparation includes:

1. Check the base

Check structure and condition.

2. Check the base edge

Maintain 0.5°.

3. Prepare the sidewall

Create free access to the edge.

4. File the side edge

Create an 87° race angle.

5. Polish

Work with several diamond files.

6. Deburr

Adjust shovel and tail of the ski.

7. Wax the skis

Prepare and protect the base.

8. Brush out

Expose the structure.

Only the interaction of all these steps ensures maximum performance on snow.

Angle and Sidewall Cutters

For precise angles and reproducible results.

Files

For controlled material removal.

Diamond Files

For finishing and polishing.