How to Set Up a Smart Trainer with Zwift | Pairing Order

Pair the trainer as Power Source on Zwift’s Paired Devices screen, then pair it again as Resistance — that second connection is what controls gradients.

Most riders stop after the first pairing. Zwift shows watts, the avatar rolls, and then the first climb feels like a flat road — because a smart trainer sends power and accepts resistance commands over two separate channels.

Mount the bike, plug the trainer in, open Zwift, and fill three slots on the Paired Devices screen: power, resistance, cadence.

What You Need Before You Pair Anything

A compatible smart trainer, a bike that fits it, and a device that runs Zwift are the full requirement list. Zwift runs on Mac, Windows, iOS, Android, and Apple TV, and it supports both wheel-on and direct-drive trainers. Zwift’s equipment page lists the WAHOO KICKR CORE 2 as a Zwift Ready trainer that takes an outdoor bike, and Zwift also sells the Zwift Ride all-in-one, which has to sit firmly on its trainer with no movement.

Install the trainer maker’s app before anything else and use it to check firmware and run calibration. Zwift can’t do either job for you, and the intervals differ by model. Axle and cassette requirements vary too, so the manufacturer’s instructions outrank anything you read elsewhere. Then close every other training app on your phone and computer — a trainer still bonded to another app frequently refuses to appear in Zwift’s device list.

Connections vary by hardware: Bluetooth, ANT+, Ethernet, Wi-Fi, USB, or the Zwift Companion Bridge. A desktop with no built-in Bluetooth needs a USB ANT+ dongle, and Zwift says any USB2 ANT+ dongle should work. Zwift Companion can also bridge a trainer over your phone’s Bluetooth when a laptop hits its Bluetooth limit.

Still shopping? the tested Zwift smart trainer roundup compares what each unit pairs with and where it stumbles.

What Does Zwift Cost After The Free Trial?

Monthly memberships open with the trial and then renew monthly. Annual memberships start charging right away and renew yearly. Confirm the numbers on Zwift’s pricing page before you commit — rates move.

How Do You Pair A Smart Trainer In Zwift?

Pair the trainer three times on Zwift’s Paired Devices screen: once as Power Source, once as Resistance, once as Cadence. Each slot is its own connection, and power alone gives you speed and watts but no gradient or ERG control.

1. Assemble the trainer, fit the cassette or supplied drivetrain part per the maker’s instructions, and set it on a stable, level floor.
2. Mount the bike with the supplied axle, adapters, or skewer. Confirm the frame is locked and the chain engages.
3. Power the trainer and clear firmware and calibration in the maker’s app.
4. Open Zwift, sign in, and start a ride — the Paired Devices screen appears during cycling setup.
5. Select Power Source, choose the trainer, select Close.
6. Select Resistance, choose the same trainer, select Close. This slot drives virtual gradients, and during workouts it holds your ERG target wattage as cadence drifts.
7. Select Cadence and choose the trainer if it broadcasts cadence; otherwise pair a separate cadence sensor.
8. Add a strap under Heart Rate if you wear one — Bluetooth Low Energy and ANT+ both work.
9. Select OK. When it worked, the trainer’s name sits under each slot and the resistance reading shifts as you pedal.

Pairing Problems Worth Checking

A trainer that’s still connected to another app usually won’t show up; quit that app entirely rather than backgrounding it. A computer at its Bluetooth limit drops the third or fourth sensor — switch to an ANT+ dongle or let Zwift Companion bridge the signals. Virtual shifting, which changes gear feel inside Zwift, needs compatible hardware set up through the same pairing screen, so a missing gear indicator normally means the trainer doesn’t support it.