What is a Structure (Rilling) Tool and Why does Cross Country Ski Base Structure Matter?
A rilling tool is a manual tool that sets patterns into your ski base. The pattern and depth you choose can optimize — or hurt — your base structure on race day.
Most tools roll across the base, but some are fixed. Others use a gear to cut the structure directly into the ski. Patterns vary widely. You’ll find linear, broken, angled, and cross patterns, each at different depths.
When Should You Use a Structure Tool?
Manual structure tools perform best in normal winter conditions — and they shine all the way through the warmest, wettest days. For example, at IMD JNQ #2, conditions reached the upper 40s with full sun on the course. A hand structure tool was the right call.
Do Skate and Classic Skis Get the Same Treatment?
Not necessarily. Each ski type has different needs, so treat them differently.
Classic skis can be rilled both in front of and behind the kick zone. Rilling in front of the kick zone improves glide feel. Rilling behind it helps with speed by ejecting water more quickly off the back of the ski. Classic skis also travel a linear path down the trail, often in a set track, where water melt is greater — so structure matters throughout.
Skate skis are different. They traverse the trail in vectors, often on new or untracked snow. Too much hand structure in front of the binding can make the ski feel heavy — especially when gliding or climbing in V1. Instead, start with light pressure on the tool in front of the binding, then gradually increase pressure as you move behind it.
How Do You Know What Tool or Pattern to Use on Race Day?
Test. There’s no substitute for it.
You need to test your tools regularly so you understand when they work and why. Check the prior blog post for the parallel glide test protocol. If you don’t have matched test skis — or testing just isn’t practical — then you must know your tools well. Understanding each tool’s strengths puts you in control when time is short.
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