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Zwift computes an estimate of a rider’s frontal area and uses this to compute the wind resistance they encounter, as well as the draft “wake” they produce. Interesting side-note: Zwift’s draft effect actually takes rider height and weight into account – similar to outdoors! So a taller rider will create a stronger draft than a shorter rider, and a heavier rider a stronger draft than a light one.

If it’s more efficient to ride single-file, what sort of power savings occurs in each successive rider in a typical TTT formation?Īll of the test riders were set to 183cm height, 75kg weight, and rode Zwift Carbon bikes with 32mm Zwift wheels.

Is it more efficient to ride in a standard TTT format (single-file line), or for riders to simply hold high power and “churn” continually on the front like we see in most Zwift races?.

This initial group test set out to answer just two questions: Perfect! Let’s test the group draft! Test Goals Now we can arrange a Meetup on any Zwift course, and only have those we invite visible.

That last bit was the sticky part for us – there was no way to hold a “private” group ride, until Zwift released “ Meetup-Only View” this week. Zwift certainly has ways to do this internally, but for the rest of us mortals it means cobbling together a lot of Zwift accounts, computers, and ANT sticks… then figuring out a way for just those accounts to ride by themselves! It’s much harder to test the group draft, because you have to have multiple Zwift accounts set up, each on separate machines, and be able to control each rider individually on a flat course without interference from outdoor riders. It shows a special secret “draft viewing mode” – fascinating! But just how powerful is that draft? Here’s a screenshot I grabbed from a recent GCN race broadcast. But what everyone really wants to know is how the draft behaves in larger groups! How much power am I saving if I’m riding 5th wheel, instead of 2nd? What’s the most efficient power plan for a team time trial? We also looked at draft savings up climbs and down descents. Our initial draft tests showed a wattage savings of approximately 25% when drafting behind a single rider. We had already done some testing of the draft effect, but only with two riders. (It’s still used in some events to help groups stay together, but racers have found that it makes races less exciting since it raises overall pack speeds, making it more difficult for attacks to stick.) And Zwift themselves implemented “ double draft mode” back in 2018 – an optional event mode which increases the draft effect substantially so it’s more in line with outdoor levels. In the past I’ve advocated for Zwift to let us “feel” the draft by changing resistance based on our draft status.

There are, perhaps, some improvements which could be made to the draft.