Do you have any idea what the over or under pronation setting does? I’ve emailed to ask if it can be adjusted and what impact it has. I also queried if they were going to send a sample to trainer road for power matching 
Yesterday Shai from Avio told me to try and use this ‘rider dynamics’ to match my power to my Tacx Neo. Use a positive number to increase the watts and a negative to decrease. Obviously this will only help if your error is consistent. I got my crank back from re-calibration today (with the battery missing) I will test this out tonight and also see what their re-calibration efforts have done.
1 Like
Well this thing is a random number generator. Out of the box after a zero offset it was under reading by about the 30%. The calibration figures are out of the normal range as shown by Avio, but I assume they know what they are doing. I used the rider dynamics to try and tune the power to match my Neo, but even up at 142% at 260W it was still bouncing around and not consistent. The problem is, that when I went much higher it then started to read and then will less power (150W) it was under reading by a significant margin. To cap it all the rider dynamics value reset itself after I reopened the Avio app. I have sent a couple of .fit files to avio, but I am seriously planning on getting my money back if they cannot come up with some decent suggestions pretty soon. I wonder if they have no idea how to work with carbon cranks and a BB3O bottom bracket
1 Like
That’s a big worry. Mine is still over reading compared to the tacx but it’s a constant number (around 10%) and they tested it against a SRM before returning to me. I’m trusting that it’s a reasonable variation for a single sided crank PM compared to a smart trainer measured at the hub when I also don’t know my L/R imbalance.
I see they are being exclusively distributed by Raleigh now as well, so the product really needs to be consistent and reliable.
I just wanted to thank you for this thread and all the reviews/comments. You saved me, and surely others, money and time. This goes for the IQ2 thread as well.
I’ll get another 4iiii single sided. My current one has been consistent, accurate, perfect with both ANT+ and Bluetooth, smooth cadence reporting, and doesn’t seem to drift with temperature either.
1 Like
Check out probikekit. They are selling the 4iii single sided for £199 (silver only)
1 Like
Afraid I haven’t a clue. I’m curious myself; guessing that the crank must deform differently depending on how far away from the arm the force is applied and over/under pronation maybe moves that centre in/outboard (but then why not just call it q-factor as that would effect it too?)
Even more curiously I don’t think I’ve heard of other crank arm based systems have a similar setting.
Glad to hear it I’m a weirdo who’s happy to experiment for (hopefully) the benefit of the company and the wider community but I definitely get the impression that cheap power meters right now are a gamble, especially as WatTeam seem to have sunk and left their customers without support.
1 Like
The same seems to go for new and expensive trainers. Hence my choice of 4iiii and a dumb Tacx trainer. For training I need all the mental energy and focus I can get, without the hassle of troubleshooting stuff every other workout. But from a hobby perspective, new gadgets and beta testing is fun.
1 Like
For real pronation and under pronation you can solve that by calibrating with the weight hanging from the part of the pedal where you put most pressure (i.e. towards the carnk or away from the crank). Rider Dynamics as set by Avio is is just a good way of applying a correction to the power, I assume to counteract left and right leg inbalances. If you play with the values you will find that a number over 100 will be saying that your left leg is weaker than your right and therefore, when the power is doubled to account for two legs that it should be a little bit more than doubled. I have used this to try and correct an under read, but whilst it changes the values, I have an under read at low watts and an over read at high.
Hah! Yeah Wahoo seem to have dropped the ball with the 2018 kickr. I still have an axe to grind about their ‘support’ for my Gen 1 kickr, which was rendered useless in my previous home by suspected wifi interference. To cut a long story short they basically just shrugged. Granted, there wasn’t a lot they could do about it but they just refused to acknowledge the problem and kept telling me to clean the optical sensor.
Maybe they sent your review model to someone in Amsterdam instead.
2 Likes
Hi lads. New to the forum but I want to chime in my 2 cents on the Powersense. I received mine after xmas and all was well. On the initial ride I did think the reading was low compared to my stages on my road bike. I was going to run a comparison session to see how much they differed until last weekend when the unit died on a long MTB ride. When I got home the battery compartment had some water in it. Dried it out and re-calibrated it (10kg weight on pedal was only reading 90nm not 98nm). Reported the water issue. Felt like I was being told this wasn’t possible. Continued on using it for the following session. It was initially reading fine until I went from 3 degrees C to -2 degrees. As i gained altitude and the temperature dropped so did my watts when eventually they equated to zero. I scrapped using the meter for this session and went off HR alone. I got home and had enough of messing around with this unit. I asked and received a refund.
I thought they were on to something special here but it appears it may need a little more real word testing to iron out all the creases. They have got back to me every time I contacted them though but I just don’t have the time to give to stick through it getting it to work. Unfortunate really.
1 Like
Well to be fair to Avio, they are trying to sort my problem. I had a call from an engineer and we ran through a few things and had a good general discussion. After work I created a few more fit files for them as my problem still exists. Let’s see if I get any luck over the next day or so.
Yeah, to be honest I’m a bit relaxed about the whole thing myself as long as the customer service is there. I like supporting new start ups, especially when they are UK or Irish firms.
Yeah look, I’m not slating them at all. I’m just saying it doesn’t work for me is all. I love to see startups get off the ground and what they are doing is great. As I said it’s only a matter of time before they iron out the creases. I’m racing and training flat out at the moment so can’t be interrupted by equipment not doing what it should.
1 Like
That’s a perfectly reasonable position to take. If I didn’t have my smart trainer I probably would have returned mine, but as it’s secondary for outdoor rides I’m happy to hang in there
My unit does not match or track my kickr power output, sometimes it is spot on, other times it is out by 30W (both devices are stored at the same constant temperature)
Should they be more in line? I wasn’t expecting them to be, both use different methods of measuring and calculating power, so there will be some difference?
But what I am after, is consistency from all the devices.
I’m hoping a lot of the issues can be quickly fixed (via software), otherwise it might be a 4iiii for me too.
Do you calibrate both of them after you’ve warmed up on every test? If both are working correctly and calibrated the difference between them should be reasonably, but not exactly, consistent from workout to workout.
I’m curious as to whether you see a constant difference from the start of the workout until the end or if there’s drift.
There will almost certainly be a difference in the reports if both devices are reporting to the best of their ability. Your kickr will experience drive train losses. The Avio will be subject to 2x your left/right imbalance (which commonly changes with duration and intensity of workout).
I’m hoping that the accuracy issues are something they can fix with firmware updates. If what I’m seeing is just wonky temperature compensation it might be as simple as that
I also notice on the avio facebook page that they are now talking about allowing the Power meter 10 seconds to calibrate itself after you’ve hit the zero offset/calibrate button on whatever app or head unit you are using.
I think this is a change as most people normally hit zero offset and then clip in straight away