“Trainer Difficulty” is absolutely the most misunderstood Zwift setting (Menu>Settings). Zwift’s help video says:
This adjustment won’t change how far or fast you ride, but it will change how climbs feel…
This setting is really a “gradient scale.” Zwift is constantly sending current gradient numbers to your smart trainer, and the trainer adjusts its resistance to match the gradient you are riding. The Trainer Difficulty setting scales the gradients sent to your trainer.
Trainer Difficulty is set to 50% by default, which is why Zwift says it “treats the gradient as half of the true grade.” So when you hit a 10% climb in Zwift, your trainer is only giving you the resistance of a 5% climb.
Bump your Trainer Difficulty up to 100% and you’ll feel the full gradient. Set it to 0% and you won’t feel gradient changes at all!
How Trainer Difficulty Affects Your Ride
Lowering your Trainer Difficulty decreases resistance changes on hills. You still have to put in the same amount of power to get up (and down) the hill, but you will “feel” the hill less.
Another way to look at it: Trainer Difficulty determines how much shifting you will need to do. Where you might typically use ~7 of your gears when riding at the default 50% setting, lowering it to 25% would let you ride and only use ~4 gears, since the incline changes are less dramatic.
Increasing your trainer difficulty, on the other hand, will force you to use more gears. So instead of 7, you may use 10 or 12, since the hills will feel steeper and you will need to shift more to maintain a healthy cadence.
What It Does Not Do
Changing Trainer Difficulty does not change the power needed to get up the hill. You still have to put out the same watts to move the same distance as before… you’ll just be doing it in a different gear.
“Trainer Difficulty” really is a misleading name for the setting. Perhaps “Gradient Feel” or “Trainer Realism” would be better.
Frequently Asked Questions
Doesn’t a higher Trainer Difficulty make racing harder? Am I “difficulty doping” by running it lower?
A higher Trainer Difficulty will typically result in a higher VI due to more resistance fluctuation. For many riders this may result in an overall effort which feels more difficult since maintaining steady power is easier than doing intervals.
But this isn’t true for everyone, and skilled shifting can reduce or eliminate the effect of resistance fluctuations.
In the end, watts are watts, and your Trainer Difficulty setting doesn’t change the power needed to cover any particular stretch of Zwift tarmac. So set it wherever you’d like!
I’m spinning out on descents. Can Trainer Difficulty help me here?
One common complaint from smart trainer owners is that they get dropped by other riders on downhills. Especially if you’re running Trainer Difficulty at 75% or more, steep gradients simply won’t offer the resistance needed to put power into the pedals. It’s the same outside!
The problem comes when you’re racing against others who have their Trainer Difficulty set low, or perhaps are riding dumb trainers with a constant resistance. These riders will have the resistance needed to go hard on the descents, while you’re spinning out.
Trainer Difficulty can help here. Try lowering it to 25-40% when racing. This will make hills seem less steep, and allow you to put more power into the downhills. Give it a try and tweak the setting until it feels good to you.
For more on this topic, read Hanging with the Group Over Gradient Changes. Also–don’t forget the Supertuck!
I have a KICKR Climb, but it doesn’t respond to gradients because I’ve lowered my Trainer Difficulty. Is there a workaround?
There’s a pretty simple hack for this–see KICKR Climb Wheelsbase Hack for details.
Why don’t I see “Trainer Difficulty” in my settings?
The slider is only visible once you’ve paired a smart trainer as a “controllable trainer” in the pairing screen.
Should I Change My Trainer Difficulty Setting?
No need to change the setting if you are happy with the “feel” of your rides and aren’t struggling with yo-yoing in and out of the pack on group rides. If you think you’d like to adjust it, though, go ahead and give it a try–you can always set it back to 50%.
Thanks Eric for this article.
It helped clarify what this setting does. I was training at 50% (the default I think) and last spring, when I went outside to real hills, some of them kicked me pretty good. So I want to up the trainer feel of the hills for climbing so that when I go outside, there isn’t as big a difference.
Thanks – I am bumping up the setting to see if it helps with this.
Ride on!
I have the Kickr Core. Why don’t I feel the cobblestones, dirt, or wooden planks when I ride Zwift? Is there a setting I’m missing somewhere? I have already paired with bluetooth and the Controllable trainer.
The KICKR Core doesn’t have a road feel feature. That’s just the Tacx NEO trainer.
I don’t like the TD-setting at all, to me there shouldn’t be any other option than 100 %. What’s the point and sensation in going up the Alpe du Zwift without feeling its true gradient?
When I started Zwifting about two years ago I didn’t have a clue about TD and it took me a while before I became aware of it. Now I always use 100 % because it’s so much more real, and fun, and anything else feels rubbish to me. Everybody is of course free to use which setting they like but I think there are a large number of Zwifters out there who are not aware of the TD-setting and don’t know what they’re missing, spinning along on the default 50 %. A friend of mine had been training hard in the hills and mountains on Zwift to prepare for a mountainous MTB bike stage race in Europe. At the race he was shocked about how much harder the gradients felt compared to Zwift. He had of course been on the default TD all the time, not aware of this setting…
However, there is a downside to riding on a high TD (apart from that you obviously need low gears not to blow your knees…). Despite that you’ll need to produce the same amount of watts to go from A to B, on a rolling/hilly course it is definitely a disadvantage to ride on high TD. A disadvantage in how well you will perform compared to those on lower TD, that is. Feeling the true gradients is not a disadvantage at all, just pure joy and happiness…