Running shoe drop: what it is and how to choose it based on your running

If you’ve walked into a running store in recent years, you’ve probably seen a strange number on the box: “drop: 8 mm”, “drop: 4 mm”, “drop: 0 mm”. It’s not a marketing gimmick. It’s probably the technical parameter that will most influence how you land and where the load goes in your leg.

This guide is for beginner to intermediate runners who want to understand drop before buying a shoe, and for intermediate-to-advanced runners considering lowering their drop or switching models depending on distance. If you’ve never run more than 5 km, don’t obsess: stick with the general ideas and the common mistakes section.

What shoe drop is

The drop (or “heel-to-toe offset”) is the difference in millimeters between the height of the heel and the height of the forefoot of the shoe, measured from the ground up to your foot.

Example: if the heel sits 30 mm off the ground and the forefoot 22 mm, the drop is 8 mm. Don’t confuse drop with “stack” (total midsole height). A shoe can have a high stack and a low drop, or the reverse.

Common ranges on the market:

High drop: 8–12 mm.
Medium drop: 4–8 mm.
Low drop: 0–4 mm.
Zero drop: exactly 0 mm.

Why drop matters (and why it’s not magic)

Drop changes the angle at which your foot contacts the ground and shifts load between structures. Simplifying:

High drop tends to facilitate heel-first landing and unloads the Achilles tendon and soleus.
Low or zero drop favors a more midfoot strike, loads the Achilles and the posterior leg muscles more, and usually demands more from the foot.

That said, the evidence on whether a specific drop prevents injuries is limited. A study by Malisoux et al. (2016, British Journal of Sports Medicine) with over 500 runners found no clear difference in overall injury rate between 0, 6 and 10 mm drops, although it did observe that occasional runners tolerated low drops worse. Translation: drop matters, but there is no universal “correct” value.

High drop vs low drop: how they behave

High drop (8–12 mm): the ASICS Gel-Kayano case

The ASICS Gel-Kayano is the classic example of high drop (historically 10 mm, recent versions hover around 8 mm). Approximate price: €170–190.

Who it works for:

Runners with a history of Achilles or soleus tendon problems.
Pronounced heel striking.
Long runs at a comfortable pace (RPE 5–6, HR in zone 2).
Runners with higher body weight or who are just starting out.

But watch out: if you’ve been using high drop for years, your Achilles and calf will be little used to stretching. It’s not “better” by default, it’s different.

Zero drop (0 mm): the Altra case

Altra popularized zero drop in running. Models such as the Altra Escalante (road, ~€140) or the Altra Lone Peak (trail, ~€150) maintain 0 mm of drop and a wide toe box.

Who it works for:

Runners with good ankle mobility and strong feet.
Those who want a more natural, midfoot-oriented stride.
Short intervals or outings where you prioritize ground feel.

But watch out: the transition from high drop has to be gradual. Going from 10 mm to 0 mm overnight is a fast track to plantar fasciitis or Achilles tendinopathy.

How to choose drop for your running

Marathon and long runs (>25 km)

For most people, medium-high drop (6–10 mm) is the safest option. The cumulative fatigue in the back of the leg when running more than two hours is real, and a higher drop helps the Achilles not be the only one doing the work.

Intervals and fast paces

Here medium drops (4–8 mm) work best. They facilitate a midfoot strike without punishing too much. Many carbon-plate racing shoes sit in this range.

Trail

It depends on the terrain. On technical trail and long descents, a medium drop (4–8 mm) gives stability. On more “runner-like” trail or ultra distances, some defend low drops for ground feel. The clear example here is the Altra Lone Peak versus 8 mm drop options such as Salomon or Hoka.

Daily and easy runs

Whatever you already use and feel good in. Don’t change for the sake of changing.

Drop and footstrike type

It’s often said that overpronators need high drop and supinators low drop. The evidence doesn’t clearly support this. Pronation is a natural cushioning movement; drop doesn’t correct it, while the shoe’s stability systems (partially) do. Choose for comfort, injury history and distance, not for a footstrike label.

Common mistakes when changing drop

Lowering drop all at once. Going from 10 mm to 4 mm in a week loads the Achilles abruptly. Step down in 2–4 mm increments and allow 4–6 weeks of adaptation per step.
Ignoring weekly mileage. The more volume you do, the more you’ll notice the change. If you run 60 km/week, the transition is more delicate than if you run 20.
Copying a friend’s or a professional’s drop. Kipchoge is not you. His biomechanics and history aren’t yours either.
Confusing drop with cushioning. A shoe can have 0 mm of drop and be very cushioned (Altra Torin), or have 10 mm and be firm.
Changing drop in the middle of race preparation. Test outside of your race build, not four weeks before a marathon.

Warning: if you have a history of Achilles tendinopathy, plantar fasciitis, stress fracture or persistent pain, consult your doctor or physiotherapist before changing drop. And if you are pregnant, prioritize stability and comfort over any technical consideration.

What to do tomorrow

Check the box or the manufacturer’s website for your current shoes and note the drop. If you don’t know it, you can’t decide the next step.
Cross that data with your discomfort. Anterior knee pain? A higher drop may not help. Achilles discomfort? Don’t lower your drop right now.
If you want to try a different drop, reserve the new shoe for short runs (30–40 minutes) for 3–4 weeks before using it on long runs or intervals.

Frequently asked questions

What drop is best for starting to run?

For most beginners, a drop between 6 and 10 mm is the safest option. It reduces load on the Achilles and soleus, which tend to be weak points when the foot isn’t yet adapted to repeated impact.

Is zero drop more natural?

It’s closer to walking barefoot, yes, but “natural” doesn’t equal “better for everyone”. It requires prepared feet and ankles. If you come from years of heeled footwear (even dress shoes), your posterior chain isn’t ready at the start.

Can I alternate shoes with different drops?

Yes, and in fact it can be a good idea. Alternating two models with different drops (for example, 8 mm for easy runs and 4 mm for intervals) spreads the load across structures. Introduce the second model gradually.

Does drop affect speed?

Directly, very little. It influences the feel and which muscles work harder. Speed depends on training, fitness and, partly, on the whole shoe (plate, foam, weight), not just the drop.

How long does the body take to adapt to a lower drop?

It depends on the jump and your weekly volume, but allow 4 to 8 weeks per 4 mm of reduction for the Achilles and fascia to adapt without setbacks. If persistent pain appears, stop and reassess.