Topo vs Altra: Same Toe Box, Different Drop (2026)
Topo and Altra both sell the foot-shaped toe box, and in RunRepeat’s lab their toe boxes measure the same. What separates them is the heel: most Topos lift it by 5 to 7 mm, most Altras not at all.
On this page
Both brands give your toes the same room. Choose Topo if your calf, Achilles or heel wants a little lift; choose Altra if you want the foot flat and have built up to it.
This compares lab figures, not two brands we have worn. Every measurement below is RunRepeat’s, from one pair of each shoe. We have tested none of them, and our own catalogue holds three Altras and no Topo.
The short answer
In RunRepeat’s lab, the toe boxes are the same. Across the latest version of each model it has measured, the median width at the big toe is 81.0 mm for Topo and 81.1 mm for Altra, far above the lab’s averages of 73.2 mm for a road shoe and 74.3 mm for a trail shoe. What separates the brands is the drop: a median of 6.6 mm for Topo and 1.1 mm for Altra. For how both compare with the ten biggest running brands, see our ranking of 202 running shoes by room at the big toe.
| If your problem is | Lean toward | Why |
|---|---|---|
| A tight calf, Achilles pain, or heel pain on the first steps of the day | Topo, or Altra’s 4 mm lines | A little heel lift eases the pull of the calf and the Achilles and, through them, the load on the plantar fascia. |
| Coming from a traditional 10 to 12 mm shoe | Topo first | A smaller step down. Going straight to zero drop at full mileage is a common way to strain the calf or the Achilles. |
| A bunion, a tailor’s bunion or a Morton’s neuroma | Either | These sit at the widest part of the forefoot, where the medians are 97.6 mm for Topo and 98.5 for Altra, both above the lab’s averages of 95.2 for road shoes and 95.7 for trail. Compare the model, then choose by drop. |
| Ball-of-foot pain | Either | Drop is not the fix. Look for forefoot cushioning and a rocker sole; under the forefoot the two brands’ medians are level, at 26.6 and 26.2 mm. |
| Nothing hurts, and you already run in zero drop | Altra | It is the flat platform you are used to, with the same toe room. |
The toe boxes, measured
Both brands build on a foot-shaped last, and the lab bears that out: every Topo and Altra in the table is between 78 and 86 mm wide at the big toe, where the lab’s average road shoe is 73.2 and its average trail shoe 74.3. The roomiest in each brand are the Altra Lone Peak 9 at 85.3 mm and the Topo Terraventure 5 at 84.5; the narrowest are the Altra Superior 7 at 78.1 and the Topo ST-5, since replaced by the ST-6, at 79.0. Even those are roomier at the toes than almost every mainstream trainer on our toe box width chart. Every current Altra the lab has measured is ranked on our Altra toe box page.
The lead is smaller at the widest point of the forefoot, across the joints, where a bunion or a neuroma sits. There the medians are 97.6 mm for Topo and 98.5 for Altra, against the lab’s averages of 95.2 for road shoes and 95.7 for trail: about 2 to 3 mm more room, against 7 to 8 at the toes.
| Shoe | Toe box at the big toe | Widest point | Drop, lab (stated) | Stack, heel / forefoot | Weight |
|---|---|---|---|---|---|
| Altra Lone Peak 9 (trail) | 85.3 mm | 98.5 mm | 0 mm (0) | 23.3 / 23.3 mm | 309 g |
| Topo Terraventure 5 (trail) | 84.5 mm | 98.4 mm | 4.6 mm (3) | 25.8 / 21.2 mm | 301 g |
| Altra Escalante Racer 2 (road) | 83.3 mm | 102.4 mm | 1.1 mm (0) | 22.5 / 21.4 mm | 224 g |
| Altra Experience Wild 2 (trail; the Experience Wild 3 is not yet lab-tested) | 83.3 mm | 100.4 mm | 6.1 mm (4) | 32.3 / 26.2 mm | 266 g |
| Topo Ultraventure 4 (trail; the Ultraventure 5 is now on sale) | 83 mm | 99 mm | 6.6 mm (5) | 35.1 / 28.5 mm | 286 g |
| Topo Vista (trail) | 82.8 mm | 100.3 mm | 6.6 mm (5) | 38 / 31.4 mm | 315 g |
| Altra FWD VIA 2 (road) | 82.4 mm | 101.4 mm | 7.9 mm (4) | 36.7 / 28.8 mm | 272 g |
| Altra Paradigm 8 (road) | 82.3 mm | 95.8 mm | 2.1 mm (0) | 29.4 / 27.3 mm | 278 g |
| Topo MTN Racer 3 (trail; the MTN Racer 4 is not yet lab-tested) | 82.2 mm | 98.3 mm | 6.9 mm (5) | 33.5 / 26.6 mm | 286 g |
| Altra Torin 9 (road) | 82.2 mm | 97.7 mm | 0.3 mm (0) | 25.8 / 25.5 mm | 264 g |
| Topo Atmos 2 (road) | 82 mm | 97.5 mm | 6.9 mm (5) | 39.6 / 32.7 mm | 286 g |
| Altra Timp 6 (trail) | 81.9 mm | 99.2 mm | 0.8 mm (0) | 30 / 29.2 mm | 289 g |
| Altra VIA Olympus 2 (road) | 81.7 mm | 100.3 mm | -0.2 mm (0) | 34.8 / 35 mm | 295 g |
| Altra Olympus 6 (trail; the Olympus 7 is not yet lab-tested) | 81.1 mm | 97.5 mm | 0.7 mm (0) | 32.2 / 31.5 mm | 357 g |
| Topo Cyclone 3 (road) | 81 mm | 95.2 mm | 5.4 mm (5) | 27.2 / 21.8 mm | 193 g |
| Altra Olympus 275 (trail) | 81 mm | 100.1 mm | 0.3 mm (0) | 30.8 / 30.5 mm | 303 g |
| Altra Experience Form (road) | 80.9 mm | 97.3 mm | 4 mm (4) | 29.9 / 25.9 mm | 261 g |
| Altra Vanish Carbon 2 (road; the Vanish Carbon 3 is now on sale) | 80.9 mm | 94.4 mm | 3.7 mm (0) | 33.1 / 29.4 mm | 210 g |
| Altra Escalante 5 (road) | 80.8 mm | 99.1 mm | 2.2 mm (0) | 25.9 / 23.7 mm | 269 g |
| Topo Traverse (trail) | 80.7 mm | 98.2 mm | 4.8 mm (5) | 30.8 / 26 mm | 308 g |
| Altra Experience Flow ST (road) | 80.7 mm | 98.3 mm | 5.1 mm (4) | 30.2 / 25.1 mm | 244 g |
| Topo Phantom 4 (road) | 80.4 mm | 96.7 mm | 7 mm (5) | 34.6 / 27.6 mm | 258 g |
| Topo Ultrafly 6 (road) | 80.3 mm | 96.7 mm | 6.6 mm (5) | 33 / 26.4 mm | 272 g |
| Topo Specter 2 (road; the Specter 3 is now on sale) | 80.2 mm | 97.6 mm | 6.8 mm (5) | 36 / 29.2 mm | 238 g |
| Altra Mont Blanc Carbon (trail) | 79.9 mm | 96.6 mm | 0.3 mm (0) | 27.2 / 26.9 mm | 251 g |
| Altra Experience Flow 3 (road) | 79.3 mm | 99.3 mm | 5.2 mm (4) | 31 / 25.8 mm | 241 g |
| Topo ST-5 (road; the ST-6 is not yet lab-tested) | 79 mm | 97.1 mm | -0.2 mm (0) | 13.7 / 13.9 mm | 193 g |
| Altra Superior 7 (trail) | 78.1 mm | 96.6 mm | 0.6 mm (0) | 20.6 / 20 mm | 235 g |
RunRepeat lab figures, one pair of each, read September 2026; the latest version of each model the lab has measured. Seven have since been updated; they are marked, and the figures are for the version named in the table. Toe box is the internal width 28.3 mm from the tip, where the big toe ends. Drop in brackets is the brand’s stated figure. Three Altras, the Rivera 4, the Provision 8 and the Outroad 3, are left out because the lab measured their toe boxes under an older method whose figures are not comparable.
The real difference is the drop
Topo states 5 mm for most of its road and trail shoes, 3 for the Terraventure 5 and zero for a few minimal shoes, such as the ST-6; the ST-5 is the only zero-drop Topo the lab has measured. The lab measured more than the box says on most of them: 6.6 to 7.0 mm on the Phantom 4, Specter 2, Atmos 2, Ultrafly 6, Ultraventure 4, Vista and MTN Racer 3. Altra states zero for most of its line, and most of those measured within about 1 mm of it, but the Paradigm 8 came out at 2.1, the Escalante 5 at 2.2 and the carbon-plated Vanish Carbon 2 at 3.7. Its 4 mm shoes, the Experience range and the FWD VIA 2, measured 4.0 to 7.9 mm.
That matches our heel-to-toe drop chart, where every shoe drawn with a stated drop above zero measured higher than its box. It matters here because drop is the one thing that separates these two brands. More drop lifts the heel and eases the pull on the calf and the Achilles. Zero drop asks more of both, which is why a switch to it has to be gradual.
From the clinic. The foot-shaped shoe is rarely what gets people into trouble. The drop is. The calf and Achilles strains I see after a switch almost always follow the same story: a runner who had spent years in a 10 or 12 mm trainer went straight to zero and kept their usual mileage. Build up over weeks, and treat calf soreness that lasts into the next morning as the signal to slow down.
Stack and weight
Topo sits a little taller at the heel, and on weight the brands are a wash. The median heel stack in the table is 33.5 mm for Topo against 30.0 for Altra, while under the forefoot they are level, at 26.6 and 26.2. The median Topo weighs 286 g and the median Altra 266, but the averages are 267 and 269 g. The ranges are wide within each brand, from the minimal Topo ST-5 at 13.7 mm under the heel to the cushioned Topo Atmos 2 at 39.6, so compare the model, not the logo.
Questions people ask
Is Topo wider than Altra?
Not at the toes. In RunRepeat’s lab, the latest models of both brands have a median toe-box width of about 81 mm at the big toe, far roomier than the lab’s average road shoe at 73.2 mm. At the widest point of the forefoot, Altra’s median is about 1 mm roomier. Individual models vary by more than that, so compare the shoe, not the brand.
Is Topo zero drop?
Mostly not. Topo states 5 mm for most of its line, and RunRepeat’s lab measured most of those at 6 to 7 mm. Topo does make a few zero-drop shoes, such as the minimal ST-6. Most Altras are zero drop; its Experience range and the FWD VIA 2 are sold as 4 mm.
Is Topo or Altra better for plantar fasciitis?
For most people with heel pain, Topo. A little heel lift eases the pull of the calf on the heel, and most heel-pain patients have a tight calf. Altra suits someone who is already comfortable in zero drop, or its 4 mm models. Our guide to shoes for plantar fasciitis covers the rest of what to look for.
Is Topo or Altra better for bunions?
Either, but compare the model. A bunion sits at the widest part of the forefoot, where RunRepeat’s medians are 97.6 mm for Topo and 98.5 for Altra, a little above the average shoe; at the big toe both leave far more room than a typical trainer. If you also have a tight calf, choose Topo; if not, choose on fit.
Why does an Altra feel so different from a Topo if the toe box is the same?
Because of the drop and the stack. Most Altras put your heel as low as your forefoot, while most Topos lift it by 5 to 7 mm on RunRepeat’s figures, and the median Topo sits about 3.5 mm higher at the heel. Your calf and Achilles notice that long before your toes do.
- RunRepeat, Topo Athletic running shoes and Altra running shoes: lab reviews of each model listed (toe-box width, width at the widest point, stack heights, drop, weight, the brand’s stated drop, and the lab’s road and trail averages); read September 2026.
- RunRepeat, testing methodology: where the toe box is measured.
- Our toe box width chart and heel-to-toe drop chart.
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