JetBlack VOLT Smart Trainer In-Depth Review

1 Like

have yet to have an issue with their rollers,…but what can really go wrong with rollers…

1 Like

I have this trainer. I bought it recently on sale for under £500 and it is incredible value especially considering it comes fitted with an 11 speed cassette.

I have nothing but good things to say about it so far. The power changes are pretty much instant, and it reacts so well to changes in cadence when in Erg mode. For example, if I get out of the saddle and my cadence suddenly drops 15 rpm, the power stays consistent which is really impressive. It’s virtually silent (only noise is coming from my drivetrain). The calibration within TR is seamless too. Happy days!


I also bought one for the same reduced price, £500, but can’t recommend it unfortunately.

First two weeks were ok, other than having to use a pedal washer to make it compatible with my two Cervelo disc bikes, otherwise the frame made contact. I wasn’t aware of this issue before purchase. The supplied cassette isn’t great quality either.

Power accuracy was ok against my favero assioma duo, but a 10w discrepancy at over 200w. Not sure which is correct but I’m inclined to favour the favero.

It then developed a loud creaking sound, like a bad press fit bottom bracket. I returned it to the dealer, who have returned it to the suppliers for assessment. This is nearly a month now, so out of pocket and no trainer. Thankfully I kept my KK road machine and tbh this has nicer road feel.

I intend to get a refund as within first 30 days. Won’t risk another.

Just so you know you aren’t supposed to use TR for calibration. This also isn’t made clear, but apparently calibrating outside the app can damage it.

That’s a shame. I’ve had no issues at all with mine, works brilliantly with my dura ace group set without having to adjust any gearing tension and the power accuracy has been pretty much spot on compared to my vectors. Sounds like you might have been unlucky with a duff product mate!

Also, I checked with JetBlack and TR support when I bought the product, both of whom confirmed it was perfectly fine to calibrate within the TR app.

Good to know re: the calibration. Yep, prob just a duff one, which all brands seem to be affected by. It was certainly quiet when it worked.

My Volt has been making some noises, it seems to go away once it is warm, just wondering if anyone else has experienced the same thing? My garage is pretty cold in the morning/night (Winter in Aus), sub 8c°.

So, I bought a Volt. I was thinking about the Zwift Hub, but I dislike Zwift, and I found the Volt for the same price with free shipping. I know the Hub is a slightly improved Volt, but the improvements didn’t sound like they were going to make a difference to me.

Anyway. Has anyone got issues with the bluetooth connection? It seems fine connecting via ant+, but it needs bluetooth for firmware updates (and maybe spindowns?). On my android phone, the app can’t find it as bluetooth sensor (only ant+). The phone sees the Volt in available bluetooth connections, but an attempt to pair is rejected by the Volt (that might be correct behaviour, pairing would block the BT connection afaik). My old ipad (ios app) sees the Volt via BT, but connecting to it makes the app crash.
Jetblack recommend another utility app to troubleshoot and update the firmware, that one sees the Volt but I’ve hold back trying to update via that. Anyone else have issues like that? How did you solve them?

(Why can’t things never work out of the box?!?)

I have had zero issues with my Volt mk1, Bluetooth connection to either my iPad or iPhone has been rock solid. I dual recorded a workout once using Ant+ on my Elemnt Bolt and that was fine as well.

Have you tried disconnecting/ forgetting the ant+ connection on your Android phone. before trying to connect via BT?

There are 2 versions of the jetblack app “Jetblack” and “Jetblack Volt” make sure you are using the “Jetblack Volt” one.

Why can’t things never work out of the box

User interface error usually

1 Like

That is it. I used the “Jetblack cycling app”, what it says in the manual! No mention of a Volt-specific app, and no mention in the other app that it doesn’t fully support the Volt.

Anyway. Firmware updated. Cheers!

(Lots of issues with the apps. I’m beginning to see why Zwift thought they could improve on that!)

Mine had a creak, which I discovered was due to the rear axle not being able to pivot so there were tiny changes in alignment in the interface between the trainer axle and the bike dropouts caused by me moving the bike with trainer attached when I moved it out of the way after a session. Loosening and retightening the QR before a ride has eliminated the creak.

Just done my first ride after installing firmware 3.0. Oh dear what have they done, trainer maintains Erg but stops reporting power for 1-2 seconds every every 50s.

1 Like

Ooouuuff… BLE or ANT+?

I use SYSTM on my iPad, so Bluetooth. The first time the power reading dropped out I didn’t think anything of it then it happened again and again. I’ve never had a dropped connection in over 200 sessions using the same setup.

Sadly in the year since posting this my Volt has had several issues resulting in it being sent back for manufacturer repair twice… I must have tempted fate with my earlier post! I will be sending it back for good in the new year and replacing it with another trainer, maybe a Kickr Core/Elite Suito/Saris H3.

Are there any reviews of the Volt V2?

Ray Maker (@dcrainmaker )and Shane Miller (@GPLama ) both reviewed the original.

Are there any noticeable changes? Does it require power input the same as the original (all the media pictures show it with no cables).

I like the super accuracy of my Elite. It’s starting to grumble, and while I’m not going to buy a spare right now, I’m definitely starting to look at the options if I need to change in a hurry.

None I know of. iirc the Hub is based on the Volt V2, although there was a fork in the firmware a while back so they’re no longer a 1:1 comparison.

I can’t locate the JB VOLT 2 firmware change logs but iirc they were now doing auto-calibration and 10Hz over BLE on the 2.

Depending where you are in the world the Hub or the VOLT2 are solid options for cost/performance.

1 Like

Thanks Shane.

I’m in New Zealand and there’s currently some Volt 2 on clearance. They may not be available at that price by the time I’m ready but we’ll see :grin:

1 Like

Howdy neighbour! :wave:t3: The VOLT2 is AU$679 at BikeBug here in :kangaroo: making it ~US$438. That’s the kind of value we need to see more of in cycling.

1 Like