Quick answer
Skate sharpening grinds a hollow into the bottom of the blade, and the radius of that hollow decides how much your edges bite versus how easily you glide. A deeper hollow (a smaller number, like 3/8") gives more grip but more drag; a shallower hollow (a larger number, like 5/8"–1") gives more speed and less bite. A skate profile is the separate curve along the length of the blade: a flatter profile puts more steel on the ice for stability and top speed, while a more rounded profile trims contact for quicker agility and turns. Sharpen roughly every 15–20 hours of ice time, sooner if your stops slide or your edges feel dull. This is general guidance — a qualified sharpener or fitter should set your final hollow and profile.
Key takeaways
- Hollow (radius of hollow) controls bite versus glide; smaller number = deeper = grippier, larger number = shallower = faster.
- Profile (radius of contour) controls agility versus speed by changing how much blade touches the ice.
- A common baseline is a 1/2" hollow, with most players living between 3/8" and 5/8".
- Heavier players usually go shallower and lighter players deeper, because body weight changes how hard the same hollow bites.
- Sharpen on a schedule of ice hours, not games, and re-test with a simple thumbnail check before you commit to a session.
- Dry your blades after every skate — rust dulls edges faster than skating does.
What does "hollow" mean, and how does it change bite vs glide?
The bottom of a hockey blade is not flat. A sharpening wheel grinds a concave groove down the middle, which leaves two edges — an inside edge and an outside edge — that actually cut the ice. The radius of hollow (ROH) is the radius of the imaginary circle that groove matches. A smaller radius carves a deeper, tighter groove and taller, sharper edges. A larger radius leaves a shallow groove and lower edges.
Here is the trade-off, and it is the single most useful thing to understand about your skates. Deeper hollow means more bite: the edges dig in, so stops, starts, and hard turns feel locked-in, but you glide less and tire sooner. A shallower hollow means more glide: less steel cuts into the ice, so you carry speed, at the cost of grip on sharp cuts. Treat hollow as a dial you tune, not a setting you forget.
| Hollow (ROH) | Depth | Bite | Glide / speed | Feels best for |
|---|---|---|---|---|
| 3/8" | Deep | Very high | Low | Light, quick, agility-first skaters |
| 1/2" | Medium-deep | High | Medium | The common all-round baseline |
| 5/8" | Medium-shallow | Medium | High | Bigger players, glide and speed |
| 3/4"–1" | Shallow | Low | Very high | Heavy or speed-focused skaters |
Cue: think "small number, big bite." A 3/8" hollow is deeper and grabbier than a 5/8", even though 5/8 is the larger fraction. That reversal trips up a lot of players at the sharpening counter.
Coach Toms's tip: Change one variable at a time. If you want to test a shallower hollow, keep your profile, skates, and the rink the same, then skate two or three sessions and score how your stops and glide feel out of 10 each time. When players change the hollow, the profile, and the ice all at once, they can feel a difference but have no idea what caused it — so they can never repeat it.
What is a skate profile, and how does it affect agility vs speed?
Hollow is the groove across the blade. Profile — also called the radius of contour or the rocker — is the curve along the length of the blade, from toe to heel. If you look at a blade from the side, it is not straight; it arcs gently, and only a portion of the steel touches the ice at any moment. The profile sets how big that contact patch is and where it sits under your foot.
A flatter profile (a larger radius, for example 11 feet) lays more blade on the ice. More contact means more stability, longer glide, and higher top speed in a straight line — but it turns a little slower. A more rounded profile (a smaller radius, for example 7–9 feet) puts less blade down and pulls the contact point toward the middle of your foot. That makes the skate quicker to pivot, turn, and change direction, at the cost of some straight-line speed and stability. Many players run a combined or dual radius that blends both.
Profiling is more specialized than a routine sharpening and it changes far less often. The first thing I check with a skater who says their edges "feel off" is whether it is really the hollow or actually the profile — a fresh sharpening will not fix a profile that does not match how you move. That is a job for a trained fitter with the right equipment.
| Profile radius | Blade on ice | Strength | Trade-off |
|---|---|---|---|
| Flatter (e.g. 11 ft+) | More | Top speed, glide, stability | Slower to turn |
| Rounder (e.g. 7–9 ft) | Less | Agility, pivots, quick turns | Less glide and stability |
| Combined / dual | Balanced | Blend of both | Needs a skilled fitter |
How often should you sharpen, and what are the signs?
The honest answer is that it depends on your weight, your ice time, how hard the rink freezes, and how aggressively you skate. A workable baseline for most players is every 15–20 hours of ice time. Track hours, not games or weeks — a player doing three practices and a game a week hits that mark far faster than a once-a-week skater. I have players keep a simple note on their phone of the date they last sharpened; it removes the guesswork.
You do not have to rely only on the clock. Your edges will tell you when they are gone. Watch for these signs:
- Stops slide out. You go to stop and the blade skids instead of shaving snow.
- Edges wash out on tight turns. You lose your grip mid-crossover or on a hard cut.
- The thumbnail test fails. Lightly drag a thumbnail across the edge — a sharp edge catches and shaves a sliver, a dull one slides off.
- Visible nicks or burrs. Run a finger along the side of the blade (never across the edge) and feel for rough spots from pucks, sticks, or concrete.
- You feel tentative. When you stop trusting your feet on cuts, your edges are usually the reason.
Watch for the opposite problem too: fresh, deep edges can feel "grabby" for a session as you adjust. That is normal, not a bad sharpening.
How to choose a hollow by weight and playing style
Body weight matters because a heavier skater pushes the same edge harder into the ice, so a given hollow bites more under a big player. That is why lighter players often go deeper to find grip, and heavier players go shallower to avoid fighting drag. Use the table as a starting point, then adjust for style: an agility-first forward can lean one step deeper for bite, a speed skater or a defenseman who covers ground one step shallower for glide.
| Player weight | Starting hollow | Then adjust for style |
|---|---|---|
| Under 120 lb (youth) | 1/2" – 3/8" | Deeper if they slide on stops |
| 120–170 lb | 1/2" | The safe all-round default |
| 170–210 lb | 1/2" – 5/8" | Shallower if edges feel draggy |
| Over 210 lb | 5/8" – 3/4" | Shallower for glide, deeper only if slipping |
None of these are rules — they are hypotheses to test. The number that lets you stop, turn, and glide the way your game demands is the right one for you, and it is worth telling your sharpener the exact hollow you want rather than accepting "house standard."
How to care for your skates between sharpenings
Good edges last longer when you protect them. Off the ice, edge and balance work also helps you get more out of whatever hollow you run — training your inside and outside edges on a slide board builds the push-and-glide mechanics that make a sharp skate actually pay off. Here is the routine I give every player:
- Wipe blades dry after every single skate. Moisture plus steel equals rust, and rust dulls an edge faster than any amount of skating. Use a dry cloth on the blade and holder.
- Use hard guards to walk, soft soakers to store. Hard guards protect edges from concrete and rubber floors; absorbent soakers wick away hidden moisture in your bag between sessions.
- Never store skates in soakers wet. Let steel air-dry first, then bag it. Store at room temperature, not in a freezing car trunk.
- Check for nicks before you skate. Feel along the sides for burrs; a small nick can be knocked down with a honing stone, a big one needs a sharpen.
- Get profiling done by a professional. Sharpening you can schedule around; a profile change is a precise job for a trained fitter, not a driveway experiment.
Coach Toms's tip: Keep a two-line skate log — the date you sharpened and the ice hours since. After three or four cycles you will see your own real number instead of a generic "every two weeks." I have players who need a fresh edge at 12 hours and others who are fine at 22; the data tells you which one you are, and it turns sharpening from a guess into a plan.
Common mistakes
- Confusing the numbers. Assuming a bigger fraction means a sharper skate. Fix: remember small number = deeper = more bite.
- Sharpening by the calendar. "Every two weeks" ignores how much you actually skate. Fix: track ice hours and re-test with the thumbnail check.
- Copying a pro's hollow. Their weight, style, and ice are not yours. Fix: start from your weight and adjust by feel.
- Over-sharpening. Fresh edges every skate removes steel fast and can leave you fighting too much bite. Fix: sharpen when the edge is actually gone, not out of habit.
- Ignoring the profile. Blaming the hollow when the real issue is contact length. Fix: if a fresh sharpen never feels right, have your profile checked.
- Storing blades wet. Rust ruins an edge between sessions. Fix: wipe dry every time and never bag steel damp.
FAQ
What does the radius of hollow number mean?
It is the radius of the groove ground into the bottom of your blade. A smaller number, like 3/8", is a deeper hollow with sharper, grippier edges. A larger number, like 5/8" or 1", is a shallower hollow that glides faster with less bite. Most players sit between 3/8" and 5/8".
Does a deeper hollow make me faster?
No — usually the opposite. A deeper hollow gives more bite for stops and turns, but it also creates more drag, so you glide less and tire sooner. If straight-line speed is your priority, a shallower hollow keeps more speed with less grip.
How often should I sharpen my skates?
A common baseline is every 15–20 hours of ice time, but it varies with your weight, how hard you skate, and ice conditions. The best method is to track hours and re-test your edges with a thumbnail check. Sharpen when stops start sliding or the edge no longer catches your nail.
What is skate profiling and do I need it?
Profiling shapes the curve along the length of your blade, which sets how much steel touches the ice. A flatter profile favors speed and stability; a rounder one favors agility and quick turns. It changes rarely and should be done by a trained fitter, not adjusted every sharpening.
What hollow should a heavier player use?
Heavier players usually go shallower — often around 5/8" to 3/4" — because their weight makes any hollow bite harder, so a deep one just adds drag. A shallower hollow keeps grip manageable while preserving glide. It is still a starting point to adjust by feel.
How do I keep my edges sharp longer?
Dry your blades with a cloth after every skate, since rust dulls steel faster than skating does. Use hard guards to walk on hard surfaces and absorbent soakers to store, and never bag your skates wet. Check for nicks before each session and knock down small burrs with a honing stone.
Summary
Two settings decide how your skates feel: the hollow, which trades bite for glide across the blade, and the profile, which trades agility for speed along its length. Start from a 1/2" hollow, adjust up or down for your weight and style, and track ice hours so you sharpen on data instead of habit. Protect your edges by drying them every skate, and leave profile changes to a professional fitter — this article is general guidance, not a substitute for a good sharpener who can feel your steel. To turn those edges into real on-ice skating, work your inside and outside edges with our edge work drills, sharpen your stopping with the hockey stop guide, and build stride power in the stride power guide. For more, browse the Hockey Training hub.
