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    Speed Tests

    Learn How Zwift’s Gravel Bikes Perform

    Eric Schlange
    By Eric Schlange
    December 10, 2019
    LAST UPDATED November 10, 2023
    60

    Zwift released its first gravel bikes in their December 2019 game update. The Cervelo Aspero, Canyon Grail, Canyon Inflite (actually a cross bike), and Zwift Gravel were built in game similar to how they’re built outdoors: to perform well on dirt while also zipping along nicely on pavement. Later, the Lauf True Grit and others were added to the list.

    But how do they actually perform in game, and how do they compare to Zwift’s mountain bikes and the established crop of road rigs?

    We ran extensive tests to find out. Here are the results.

    Flat Pavement Performance

    Here’s how each of the gravel bikes performed over two laps of our Tempus Fugit test segment (300 watts steady, 75kg rider):

    1. Cervelo Aspero: 53:47
    2. Canyon Grail: 53:49
    3. Specialized Crux: 53:50.5
    4. Giant Revolt Advanced Pro, Liv Devote Advanced Pro: 53:51
    5. Allied Able: 53:51.5
    6. Canyon Inflite: 53:53
    7. Specialized Diverge: 53:53.5
    8. Zwift Gravel: 53:54
    9. Lauf True Grit: 53:57

    The Aspero wins this contest, with the Grail close on its heels.

    The fastest road bikes complete the test route in 50:17, while the slowest road bikes (Zwift Steel with 32mm carbon wheels) complete it in 51:40. Clearly, gravel rigs perform quite poorly on pavement.

    The fastest mountain bikes complete the test route in 55:40, meaning the gravel rigs are turning in times right in between the fast road bikes and the slower MTB.

    Hands-On Experience

    I found the gravel rigs to be quite challenging on pavement. I had to hold ~30 more watts than those around me just to hang with the group on the flats, turning a “2.0-2.5 w/kg spin” into something a bit more tougher.

    Climb Performance

    Here’s how the new gravel bikes performed up the big Alpe du Zwift climb:

    1. Specialized Crux: 51:18
    2. Canyon Grail: 51:25
    3. Allied Able: 51:35
    4. Cervelo Aspero: 51:39
    5. Giant Revolt Advanced Pro, Liv Devote Advanced Pro: 51:42
    6. Specialized Diverge: 51:51
    7. Canyon Inflite: 51:55
    8. Zwift Gravel: 51:56
    9. Lauf True Grit: 51:58

    The super-light Crux wins the climbing contest quite handily, with the Grail 7 seconds behind.

    The fastest road bikes climb the Alpe in 48:50, while the slower (Zwift Steel with 32mm carbon wheels) complete it in 49:55. We already know the gravel bikes are slower on flat pavement, so this is not surprising.

    The fastest mountain bikes climb the Alpe in 55:21. The mountain bikes are quite heavy, so this isn’t surprising, either. Like our flat tests, the gravel bikes sit squarely in between the road bikes and mountain bikes in terms of time up the Alpe.

    Jungle Performance

    Here’s how the gravel bikes perform on one lap of the Jungle Circuit using the basic Zwift gravel wheels:

    1. Specialized Crux: 13:20
    2. Canyon Grail: 13:21
    3. Cervelo Aspero, Allied Able, Giant Revolt Advanced Pro, Liv Devote Advanced Pro: 13:22
    4. Specialized Diverge: 13:23.5
    5. Canyon Inflite, Zwift Gravel: 13:24
    6. Lauf True Grit: 13:25

    The Crux just barely edges out the Grail, which just barely edges out the Aspero. But the Aspero is close behind.

    The faster road bikes complete a jungle lap in around 13:35. Zwift’s gravel bikes drop lap times by around 15 seconds, so if you extrapolate that difference out over 4 laps we’ve got a difference of 1 minute between the road bikes and gravel bikes.

    Gravel Conclusions

    The Specialized Crux is definitely the bike to have when it comes to gravel climbs, while the Cervelo Aspero is a better performer on flats and descents. The Grail is somewhere in between, being a bit more aero than the Crux and a bit lighter than the Aspero. Choose accordingly.

    Your Thoughts

    Have you tried out a gravel rig in Zwift? What did you think? Share below!

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      Eric Schlange
      Eric Schlangehttp://www.zwiftinsider.com
      Eric runs Zwift Insider in his spare time when he isn't on the bike or managing various business interests. He lives in Northern California with his beautiful wife, two kids and dog. Follow on Strava

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