Sale: $ MSRP: $

For the runner looking to go low and light, the Inov-8 Road-X-Treme 178 features minimal cushioning and a firm ride.



Lace up the Inov-8 Road-X-Treme 178 for a low profile and nimble running experience. Featuring a 3mm heel-to-toe offset to encourage an uninhibited stride, this lightweight shoe provides resilient and responsive cushioning, while an accommodating, anatomical fit offers plenty of room for your toes to splay naturally.

Model Number:

Weight: 7.1 oz (size 9)

Stack Height: Heel (14mm), Forefoot (11mm)

Available Widths: D=Medium

How It Fits (based on width D)

    •    Sizing: Standard running shoe length
    •    Heel: Medium
    •    Midfoot: Medium volume
    •    Forefoot: Medium to wide
    •    Toebox Height: Medium
    •    Arch Structure: Low
    •    Shoe Shape: Semi-Curved


The Road-Xtreme 178 is a minimum feature, minimum neutral shoe intended for training and racing.


  • 1 Arrow Shoc-Zone provides minimal underfoot cushioning and a 3mm heel-to-toe drop. This is Inov8's 2nd lowest level of cushioning on their 0-4 arrow scale.


  • Injected EVA Foam for resilient cushioning with maximum memory retention.


  • Synthetic Mesh covers the upper for lightweight, breathable coverage.
  • TPU Lacing System uses TPU lacing supports for a strong, lightweight and secure fit.
  • Met-Cradle is a synthetic webbing upper that supports the forefoot and provide a secure fit.
  • Anatomic Last follows the natural shape of the human foot for a close and comfortable fit.


  • Road-X-Treme is a lightweight outsole intended for road racing, speedwork, and everyday training.
  • Sticky Fusion Compound is a mix of synthetic rubber and EVA foam for a smooth ride and grip on the road.
  • Meta-Flex groove is located at the forefoot to encourage natural forefoot flex during toe-off.

Footwear Performance Characteristics

Pronation Control: What's This?

  • Neutral
    • Min
    • Mod
  • Support
    • Min
    • Mod
    • Max
  • Motion Control
    • Mod
    • Max

Heel-Toe Offset (mm): What's This?

  • 0
  • 1-2
  • 3-4
  • 5-6
  • 7-8
  • 9-10
  • 11+

Stack Height:

  • Barefoot
  • Minimal
  • Low
  • Medium
  • High
  • Maximal


  • Road
  • Road-Trail
  • Hard Trail
  • Varied Trail
  • Soft Trail

Shoe Type:

  • Premium
  • Standard
  • Performance
  • Racing

Customer Reviews

Comments: I had moved up from the Road -X 233 to the above (~2 month ago), as I was looking to improve upon my sprint abilities and time and move to a lower drop shoe, before attempting to run barefoot or trying on Vibram Five Fingers. And while the shoes is light on my feet and flexible, and, I love it's tongue free design, I am disappointed with it's overall fit; namely - it's length which I can somewhat overcome by using different sock, but not it's width. A complain that's in large part has to do with the advise I was given by runningwarehouse advisers, who assured me that size 11 is fits the same as the X-233 size 10.5 I had purchased from runningwarehouse. Unless the shoes is to be discontinued, isn't it time to add it to "shoefitr? If not for the fact that I am overseas, I would have returned it on the spot. My advise - stick with your normal size.
From: Danny, Tel Aviv, Israel. 1/31/14

Comments: Could not be happier with this shoe. This has become my go-to shoe for the majority of my runs. This shoe feels fast. Prior to this I spent most of my road miles in the Kinvaras and trail miles in the MT110. Feels like a more spacious alternative to flats like the A5. Great sockless feel. Ride is firmer than the Kinvara (more similar to the A5 flats).
From: Luke, NC