Which ANT+ to BLE bridge to buy?

Is this the bridge people are buying or is there something else out there in the market?

That one is a very popular choice. Another option is the Viiiiva HRM

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Thanks Paul…so does the Viiive actually bridge ANT+ signals from multiple other sources like indoor trainer, cadence sensor, etc. in addition to performing HRM?

Yep, it does: https://4iiii.com/viiiiva-heart-rate-monitor/

Cable works a treat for me on ATV. Easy to set up/amend/link

Loyal Viiiiva HRM user here for a few years now. It’s simple, works, and has been problem free.

I actually have the cable and the 4iiii heart rate monitor - I prefer the heart rate strap.
Once HR and cadence are set on it just pairs with Apple TV. The cable is just more clunky and it needs the companion app.
This then causes me issue with my Bluetooth headphones… blah blah blah

Cable doesn’t need the companion app. I have Kickr 17 and ATV. Controllable trainer is Kickr. Cadence, HR and power all through Cable. No issues. no companion app needed.

I use the 4iiii to bridge a cadence sensor with the ATV. It pairs and performs flawlessly. My only complaint is with how fast it goes through batteries. The battery has to be changed about every 6 weeks.

Can’t seem to get this to work on my Saris/Cyleops trainers (esp Powerbeam Pro) with either AppleTV or iPhone11. It pairs and then as soon as you enter the Zwift world, there is no connection and Zwift no longer sees it when I go to re-pair the CABLE.

Worth noting that I’ve been using Zwift for many years (made level 40 this week!) and am in the electronics/networking industry, so I have debugged this thing pretty extensively. There seems to be something between the trainer/Cable/AppleBT-API/Zwift connection that isn’t playing right. The only thing I can think to do is update my trainer firmware, but given that the CABLE should translate ANT+ (which works fine) to BT, I suspect the CABLE/AppleBT connection is the issue. Maybe I’m missing something easy?

Apple TV OS and Zwift app both updated?

Updating trainer firmware is usually a good thing. Any reason you have not or are hesitant to do so?

How far apart are all of these pieces (i.e., Cable, AppleTV, Trainer)?


AppleTV-CABLE… <1m. CABLE-Trainer…<2m

FW update requires me to lug the trainer to where my computer is located since you need an ANT+ physical dongle to update FW. Or maybe the CABLE can do that? I honestly had not thought about it. I have a MacBook Pro circa 2017 (USB-C ports only).

I’ll try to get my Hammer2 working with Cable, as I can update the FW much more easily via the Saris iPhone App (Bluetooth). That will at least isolate things down to the trainer (or not).

I am using the CABLE and BKOOL Smart Pro 2 trainer.

Everything is bridged ok between ANT+ and BLEE by the little device bit cannot get resistance control work properly. It does control resistance in ERG mode (in workouts), but does not control it properly when simulating the gradient.

Yes, yes, … I tried trainer difficulty slider, and makes no difference. Resistance control in normal simulation is quite random, and does not follow the gradient changes…

Anyone experiencing same problem?
Any suggestion?


Latest update on this issue.

With the recent software and firmware update from North Pole Engineering … it now works perfectly. Resistance control matches the track gradient/incline perfect.