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Puma Fast-RB Nitro Elite 2: dual carbon plates, outside the racing rules

Gear4 min read
On this page
  1. In short
  2. What the Fast-RB Nitro Elite 2 is
  3. Why it does not meet the racing rules
  4. What changes from the first Fast-RB
  5. What is only declared
  6. Who it makes sense for
  7. Limits
  8. Sources

What the Fast-RB Nitro Elite 2 is

According to Puma's announcement, the shoe combines NITROFOAM Elite foam with two carbon-fibre PWRPLATEs fused together into a "springboard" structure, with an ULTRAWEAVE upper and PUMAGRIP outsole.1 It is the second chapter of the "Rule Breaker" project: a road shoe developed without the constraint of racing regulations.18

Figures declared by Puma, read on 1 November 2026:12

FeatureDeclared value
PlatesTwo fused carbon PWRPLATEs
FoamNITROFOAM Elite
Weight250 g (UK 8) / 206 g (UK 4.5)
Drop8 mm
Stack47/55 mm (49/57 mm as measured by Running Warehouse)
LifespanAbout 300 km on product pages, 320 km in the press release
Price€350
Release28 October 2026, limited quantities

Why it does not meet the racing rules

The World Athletics regulations in force since 20 April 2026 allow non-spiked shoes at most one rigid structure (rule 8.5.1), which must not overlap or be stacked on more than one plane (rule 8.5.4); for road events the maximum sole thickness is 40 mm.3 The Fast-RB 2 has two plates fused into a "springboard" and a declared stack of 47/55 mm, so it sits outside both limits.12

World Athletics' approved shoe list does include other Puma racing models, such as the Fast-R and Fast-FWD, but as of 1 November 2026 the Fast-RB Nitro Elite 2 is not listed.4 Consistent with this: according to Marathon Handbook, Puma's launch material states explicitly that the shoe is not meant for official racing.5 The Running Channel lists the three points of divergence from the rules: thickness over 40 mm, more than one plate, and plates overlapping rather than lying in a single plane.7

What changes from the first Fast-RB

The first Fast-RB Nitro Elite came out in August 2024, limited to 1,000 pairs: 58 mm heel stack, 12 mm drop, three plates, a laceless upper and 355 g (UK 8), according to SideRun.6 Version 2 drops to 250 g (-105 g), brings laces back, moves to an 8 mm drop and replaces the three plates with two fused ones.6

What is only declared

The efficiency and performance estimates quoted at launch come from Puma's internal testing, SideRun reports; we found no independent lab measurements of this shoe.6 Durability is also a declared figure, not a guarantee: about 300 km on the product pages, 320 km in the press release.12 Runner's World Italia sums up the project's intent: pushing super-shoe technology beyond racing regulations.8

Who it makes sense for

Not for official road races, where World Athletics rules apply: there you need a compliant shoe (we cover this in Carbon plate running shoes). It remains usable in training, where regulations do not apply, and it has a collector profile: Puma declares limited quantities.1 We have no basis to say whether it really "works": the evidence cited is the manufacturer's.

Limits

  • All technical figures come from Puma or retailers: at the time of publication there are no independent tests of this shoe.
  • Stack figures do not match across sources: 47/55 mm on Puma's product pages, 49/57 mm in Running Warehouse's measurement.29 Either way they exceed the 40 mm regulation limit.
  • Puma does not say how many pairs are available: "limited quantities" with no number, unlike the 1,000 pairs declared for the first version.
  • The approved-list check is dated 1 November 2026: the list is updated and a model's status can change.

Sources

  1. Puma Media Hub, "Puma unveils Fast-RB Nitro Elite 2, marking a new frontier in speed", October 2026. mediahub.puma.com. Read on 1 November 2026.
  2. Puma UK, Fast-RB Nitro Elite 2 product page (314984). uk.puma.com. Read on 1 November 2026.
  3. World Athletics, C2.1A Athletic Shoe Regulations, effective from 20 April 2026: rules 8.5.1 and 8.5.4 (rigid structures) and the sole thickness table (40 mm for road events). worldathletics.org (PDF). Read on 1 November 2026.
  4. World Athletics, Approved Shoe List (Full List). certcheck.worldathletics.org. Read on 1 November 2026.
  5. Marathon Handbook, "Puma Fast-RB Nitro Elite 2 Launches at €350", October 2026. marathonhandbook.com. Read on 1 November 2026.
  6. SideRun, "Puma Fast-RB Nitro Elite 2: Price, Weight, Release and Rules". siderun.com. Read on 1 November 2026.
  7. The Running Channel, "Puma Fast-RB NITRO Elite 2: The Illegal Super Shoe". therunningchannel.com. Read on 1 November 2026.
  8. Runner's World Italia, "Puma infrange le regole e lancia Fast-RB Nitro Elite 2, super scarpe con doppia piastra", 29 October 2026. runnersworld.com. Read on 1 November 2026.
  9. Running Warehouse, Puma Fast-RB Nitro Elite 2 specs (stack measurements). runningwarehouse.com.au. Read on 1 November 2026.

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