Asics Piranha SP Review

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The Piranha is an ultralight shoe that provides a reasonable level of cushioning for its weight. This is less cushioning than most runners will be looking for, and it's cushioning to weight ratio is not as good as the best. In the same weight range, the New Balance RC5000 is ~25% lighter with similar cushioning, the Saucony Endorphin is similar weight and cushioning but zero drop, and the New Balance RC5000v2 is a similar weight but a lot better cushioned. So the Piranha is a good shoe, and gets my "recommended" rating, but there are shoes that are better. (I use The Science of Running Shoes as the basis of how I test running shoes and what you should look for in a running shoe.)

Asics Piranha SP 5 top
Asics Piranha SP 5 bottom
Asics Piranha SP 5 inside
Asics Piranha SP 5 outside

1 Characteristics

  • Why you’d buy it. If you're after an ultralight, fast shoe with low levels of cushioning, but not quite minimalist, this is worth considering.
  • Cushioning . The Piranha is reasonably well cushioned given its weight of only 4.2oz. There is a lot less cushioning than you'd find even in shoes that most people think of as light weight like the Asics Gel Hyper Speed, but even the Hyper Speed weighs half as much again. The Piranha has just enough cushioning for me to consider it an optimal rather than a minimalist shoe. The lack of cushioning in a minimalist shoe reduces Running Economy, but the Piranha allows me to run with just the same biomechanics as I would in a far more cushioned shoe.
  • Drop. The Piranha has 4mm of drop, and I didn't have any biomechanical issues. The drop is only 3mm when worn, which is close to zero drop for most people.
  • Structure. The Piranha uses a single density of foam and has no "arch support" to cause foot problems. The hole in the underside is a bit of a stone trap, but it didn't cause me issues.
  • Flexibility. The Piranha is very flexible due to its thin midsole combined with several gaps in the outsole.
  • Outsole. The Piranha uses the small, hard plastic lugs over the forefoot that are common in this type of lightweight shoe. These are not trail lugs, but provide great grip on asphalt.
  • Shape. Sadly the Piranha is like most running shoes and has a toe box that is not designed for humans. I recommend you cut open the toe box open to prevent toe problems. (I recommend cutting open the toe box of virtually all running shoes, with the exception of a few shoes like some Altra shoes. When you have some worn out shoes, you should try cutting open the toe box. I've found that it's a big improvement, allowing my toes to move naturally and engage for toe off, as well as reducing the possibility of blisters.)
  • Upper. The upper is thin, inflexible and almost completely seamless with no padding, but I found it quite comfortable. There upper is not quite as breathable as I'd like, but it's better than most heavier shoes. I upper is tougher than you might expect from a shoe this light.
  • Tongue. The Piranha has a traditional tongue with a tab to attach it to the laces. The tongue is so thin that I had problems keeping it flat when I put the shoe on, but it fine once it was on.
  • Lacing. The Piranha has traditional flat laces that stayed tied without a problem.
  • Heel Counter. There is no real Heel Counter, just a tiny tab that reinforces the back of the heel.

2 How Far Can I Run in the Piranha?

Different runners want different levels of cushioning, so this shoe may not suit everyone. Some runners want a Maximalist shoe when they run a 5K, while others will run a 100 mile race barefoot. Most people find that as the distance increases, they want a little more cushioning to protect their feet from the pounding and to offset a little of the fatigue that sets in over time. You can see from the charts below how the cushioning compares with other shoes I've tested for some comparisons. Remember that a thicker, firmer shoe would have the same cushioning rating as a thinner, softer shoe, but would feel rather different. For me, the Piranha is a little under-cushioned for the marathon distance, but if you want something that spans the minimalist/optimal border this could work for you.

3 Cushioning and Shoes

It's intuitively obvious that the cushioning in a shoe will reduce the impact on your body when running. However, The Science of Running Shoes indicates that the reality is rather more complex. While slight cushioning may reduce the effort needed to run by improving your Running Economy, most scientific research indicates that more cushioning does further improve Running Economy. In addition, cushioning does not generally reduce impact and may actually increase it. This is counterintuitive, but is likely to be due to the way a runners mind and body adapts to softer cushioning. Unfortunately, the scientific evidence is far from complete and it's hard to give clear recommendations. I believe that some runners will prefer more cushioning, while others prefer less, and typically those running further have a fondness for greater cushioning. I also believe that a shoe should be as light as possible, and a shoe should justify its weight with the cushioning it provides. My advice is to decide what level of cushioning you're looking for, and then find the lightest shoes that also fit well and are comfortable.

4 Visualizing the Attributes of the Asics Piranha SP

How Asics Piranha SP compares showing rearfoot cushioning against the performance penalty of its weight. Upper right is better.
How Asics Piranha SP compares showing forefoot cushioning against the performance penalty of its weight. Upper right is better.
How Asics Piranha SP compares showing the price against the benefit (cushioning/performance penalty). Upper left is better.
How Asics Piranha SP compares showing the loaded drop against the benefit (cushioning/performance penalty). Upper left is better.

5 A Comparison with other Recommended Shoes

For a more detailed comparison of these shoes see the Recommendations for Best Running Shoes. This table lists the key attributes of What to Look for in Running Shoes. For more detailed information, on the shoes see detailed shoe comparison.

Full Review

Brand Name Rating Recommended
price
Benefit Weight
(oz)
Penalty
(sec/mile)
Forefoot
Thickness
Heel
Thickness
Loaded Drop
mm
Cushioning Flexibility
Asics 33-DFA Review Asics 33-DFA Worth considering $90 5.7 10.6 16.5 27 27 0 6.1 6
Saucony Type A6 Review Saucony A6 Highly Recommended $100 8.2 6.1 9.5 17 21 4 5.0 8
Adidas Adios Boost 2 Review Adidas Adios Worth considering $140 4.7 8.6 13.4 17 27 11 4.0 7
Hoka Bondi 5 Review Hoka Bondi Recommended $150 6.1 11.6 18.1 38 42 5 7.1 4
Hoka Clayton Review Hoka Clayton Best of the Best $150 8.8 8.3 12.9 26 30 3 7.3 5
Hoka Clayton 2 Review Hoka Clayton 2 Review Pending $150 9.1 8.3 12.9 23 28 1 7.5 6
Hoka Clifton 3 Review Hoka Clifton3 Best of the Best $130 9.1 9.8 15.3 34 38 3 8.9 6
On Cloudracer Review On Cloud Cloudracer Worth considering $130 5.7 8.2 12.8 19 27 5 4.7 8
Hoka Conquest Review Hoka Conquest Worth considering $170 5.0 11.9 18.5 28 34 5 6.0 3
Saucony Cortana 4 Review Saucony Cortana Worth considering $150 4.4 9.9 18.7 22 28 5 4.3 5
Mizuno Wave Cruise Review Mizuno Cruise Worth considering $120 6.6 5.9 12.5 17 20 7 3.9 7
Newton Distance IV Review Newton Distance Worth considering $155 7.5 9.1 14.2 26 31 3 6.8 6
Asics Gel DS Racer 10 Review Asics DS Racer Worth considering $110 8.2 7.0 10.9 21 26 6 5.8 6
Mizuno Wave Ekiden 8 Review Mizuno Ekiden Worth considering $115 5.7 5.7 14.6 13 18 6 3.2 8
Saucony Endorphin 2 Review Saucony Endorphin 2 Worth considering $115 8.0 5.1 9.6 15 13 -1 4.1 8
Adidas Energy Boost Review Adidas Energy Worth considering $160 7.2 10.0 15.6 20 30 7 7.2 6
Altra Escalante Review Altra Escalante Best of the Best $130 9.1 8.7 13.5 28 25 -1 7.9 7
Puma Faas 100 R Review Puma Faas 100 Highly Recommended $90 8.4 6.1 9.4 15 20 1 5.1 9
Saucony Fastwitch Review Saucony Fastwitch Highly Recommended $90 9.5 7.1 11.1 20 22 4 6.8 8
Topo Fli-Lyte Review Topo Fli-Lyte Highly Recommended $100 6.0 9.4 14.6 23 24 4 5.6 6
Nike Free 4.0 Review Nike Free Recommended $120 5.3 8.2 13.6 24 30 6 4.4 6
Saucony Freedom Review Saucony Freedom Recommended $160 5.4 10.7 16.6 25 29 3 5.8 7
Asics Gel Lyte 33 3 Review Asics Gel Lyte Not recommended $90 8.0 7.3 11.4 17 24 4 5.8 9
Skechers GOmeb Speed 3 Review Skechers GOmeb 3 Worth considering $120 6.9 8.1 12.6 20 24 4 5.5 8
Skechers GORun 4 Review Skechers GORun Not recommended $100 6.1 7.5 11.7 15 23 3 4.5 7
Skechers GOrun Ultra 2 Review Skechers GRU Worth considering $90 7.5 10.0 15.6 28 34 8 7.5 5
Skechers GOrun Ultra Road Review Skechers GRU-R Worth considering $105 6.5 11.3 17.6 30 40 6 7.4 7
Asics GT 2000 Review Asics GT 2000 Not recommended $120 4.8 11.2 17.4 28 35 5 5.4 4
New Balance Hanzo S New Balance Hanzo Worth considering $110 7.6 6.9 10.7 21 19 2 5.2 6
Hoka Hupana Review Hoka Hupana Recommended $115 6.1 8.9 13.9 31 36 7 5.4 5
Asics Gel Hyper Speed 7 Review Asics Hyper Speed Highly Recommended $75 10.9 6.3 9.8 22 26 5 6.8 7
Altra Instinct 3.5 3.5 Review Altra Instinct 3.5 Recommended $115 4.9 9.3 15.2 24 23 0 4.5 6
Altra Instinct 4.0 Review Altra Instinct 4.0 Worth considering $120 6.0 9.8 15.3 29 25 -1 5.9 6
Asics Tarther Kainos 3 Review Asics Kainos Worth considering $130 10.0 6.9 10.7 17 27 9 6.8 7
Saucony Kinvara 8 Review Saucony Kinvara 8 Best of the Best $110 9.3 8.6 13.4 26 31 3 8.0 6
Nike LunaRacer 4 Review Nike LunaRacer Recommended $90 9.9 7.0 10.9 22 30 7 6.9 6
Nike LunarSpider R5 Review Nike LunarSpider Recommended $125 6.9 6.7 10.4 17 21 3 4.6 7
Hoka Mafate Speed Review Hoka Mafate Best of the Best $170 7.6 11.9 18.5 39 40 4 9.0 3
Pearl Izumi EM Road N0 v2 Review Pearl N0 Highly Recommended $100 7.9 6.5 10.1 14 20 4 5.2 8
Saucony Nomad Review Saucony Nomad Worth considering $110 4.3 10.5 17.2 25 27 2 4.5 5
Hoka Odyssey Review Hoka Odyssey Highly Recommended $130 8.5 9.4 14.6 37 45 5 8.0 4
Altra Olympus Review Altra Olympus Highly Recommended $130 5.4 11.8 18.4 27 27 3 6.4 4
Altra One 2.5 Review Altra One Highly Recommended $100 8.5 7.1 11.1 22 25 2 6.0 8
Altra One 3.0 Review Altra One Review Pending $100 6.1 8.8 13.7 23 23 0 5.4 7
Altra Paradigm Review Altra Paradigm Highly Recommended $130 6.4 9.9 15.4 25 25 1 6.4 4
Asics Piranha SP 5 Review Asics Piranha Recommended $100 10.1 4.2 6.5 11 15 3 4.2 9
Brooks PureFlow 5 Review Brooks PureFlow Worth considering $110 6.0 9.7 15.1 26 29 5 5.8 8
Salming Race Review Salming Race Worth considering $130 6.9 6.5 10.1 16 19 4 4.5 7
New Balance RC1600 v2 Review New Balance RC1600 Highly Recommended $110 8.8 5.6 8.7 15 21 5 4.9 8
New Balance RC5000 Review New Balance RC5000 Best of the Best $125 12.2 3.4 5.3 13 17 3 4.2 8
New Balance RC5000v2 Review New Balance RC5000v2 Best of the Best $125 14.2 4.0 6.2 13 21 6 5.7 8
Skechers GoRun Ride 3 Review Skechers Ride Worth considering $85 5.9 8.5 13.2 18 28 6 5.0 9
Inov-8 RoadXTreme 220 Review Inov-8 RXT-220 Worth considering $120 5.2 8.0 18.2 14 17 3 4.2 9
Topo ST-2 Review Topo ST-2 Highly Recommended $90 8.2 7.3 11.4 20 18 0 6.0 8
Hoka Stinson Lite Review Hoka Stinson Highly Recommended $160 7.3 11.6 18.1 35 40 6 8.5 2
Nike Zoom Streak LT 3 Review Nike Streak LT Best of the Best $80 8.8 5.4 8.4 16 21 4 4.8 6
Adidas Takumi Sen 3 Review Adidas Takumi Sen 3 Highly Recommended $160 7.7 6.6 10.2 17 21 4 5.1 6
Altra Torin 2.0 Review Altra Torin Worth considering $125 5.8 9.6 14.9 28 25 -1 5.5 5
Hoka Tracer Review Hoka Tracer Recommended $130 7.2 7.4 11.5 21 24 2 5.3 6
Merrell Trail Glove 3 Review Merrell Trail Glove Best of the Best $100 2.9 6.9 24.7 11 11 0 2.0 9
Topo Tribute Review Topo Tribute Recommended $100 5.9 7.3 11.4 20 18 -1 4.3 7
Mizuno Wave Universe 5 Review Mizuno Universe Highly Recommended $125 10.7 3.1 10.6 9 12 1 3.3 9
Merrell Vapor Glove 2 Review Merrell Vapor Glove Highly Recommended $85 2.1 6.1 27.6 6 5 0 1.3 10
New Balance Vazee Pace Review New Balance Vazee Pace Worth considering $110 6.0 8.6 13.4 18 24 6 5.2 6
Asics TartherZeal 3 Review Asics Zeal Worth considering $140 10.9 6.3 9.8 17 27 9 6.8 7

It's not a running shoe, but I love the Hoka Tor Ultra hiking boot and I've tested the Altra Lone Peak Boot.
Older shoe reviews: Saucony Hattori Review, Mizuno Cursoris Review, Skechers GO Bionic 2 Review, Hoka Clifton Review, Saucony Virrata 2 Review, Brooks PureCadence 3 Review, Brooks PureConnect 3 Review, Brooks PureFlow 3 Review, Skechers GO Bionic 2 Review, New Balance 980 Review, Brooks Transcend 2 Review.
Reviews of shoes that are not worth including on the table: Hoka Huaka Review, Patagonia EVERlong Review.