Do carbon-plate shoes actually make you faster?
On average yes — around 4% better running economy against a racing flat — but the individual response ranges from under 2% to over 7%, so the mean is not a promise.
The best-known measurement comes from Hoogkamer and colleagues, who found roughly 4% improvement in running economy for a carbon-plated racing shoe against mass-matched conventional racing shoes, in 18 of 18 runners tested. The consistency of the direction is as notable as the size.
The mechanism is a combination of high-compliance, high-resilience foam returning more of the energy stored on landing, and a stiff plate that alters ankle mechanics and reduces the energetic cost at the metatarsophalangeal joint. It is not, as sometimes described, a spring that propels you — the plate mostly changes where and how the foam and the foot do their work.
The individual spread is the part that matters when deciding whether to buy a pair. Follow-up work reported responses ranging from about 1.7% to 7.2% between runners. Some runners get very little. There is currently no reliable way to predict who, short of trying them.
Two practical consequences. A 4% economy gain does not mean a 4% faster race — at marathon pace it translates to something closer to 2–3% in speed. And the shoes are less durable and mechanically demanding in a different way from trainers, so they belong in races and key sessions rather than in daily volume.
Key numbers
| Mean economy gain | ~4% | vs mass-matched racing flat |
|---|---|---|
| Individual range | 1.7–7.2% | between runners |
| Everyday trainer | ~1% worse | than a racing flat |
Work it out for yourself
Running economy calculator — Model shoe, surface and gradient effects on your cost of running.
Frequently asked questions
How much time do carbon shoes save in a marathon?
A 4% economy improvement translates to roughly 2–3% in speed at marathon pace, which is about 4–6 minutes on a 3:30 finish. That is the population mean; your own response could be considerably smaller or larger.
Should I train in carbon-plated shoes?
Mostly no. They are expensive, wear out quickly, and load the foot and calf differently from trainers — runners who switch all their volume into them sometimes develop new problems. A few key sessions to get used to them, plus races, is the common approach.
Sources
- Hoogkamer et al. (2018). A comparison of the energetic cost of running in marathon racing shoes. Sports Medicine.
- Barnes & Kilding (2019). A randomized crossover study investigating the running economy of highly-trained runners in shoes. Sports Medicine.
Related explainers
Glossary: Cr (Cost of Running)