Wow, been far too long since I dipped in here... But I figured I'd do a bit of a catch up and help explain some of the confuision from a few weeks ago I meant to do then didn't get around to it... But FIRST, my recent Zwift exploits!
A couple of weeks back got involved in 'Ladder' racing with some EVO riders I'd ridden other stuff with getting drafted into EVO 'Odyssey'. a mixture of B+C riders, with only a couple of us climby/punchy and most of them heavier guys for flatter routes... They've been racing Friday and Tuesday but I've only done Tuesdays so far! Good fun. Small teams 5v5 is quite different racing than what I'm used to!
Loch Loop - 4th -
https://www.strava.com/activities/11355194030 https://zwiftpower.com/events.php?zid=4371234 (brutal finish, chasing wheels as other team got 3 riders away we had to chase)
Glasgow Crit - 4th -
https://www.strava.com/activities/11410908406 https://zwiftpower.com/events.php?zid=4378879 (planned to go long, 2 teammates got away, sprinted away from chase group)
Rising Empire - 3rd -
https://www.strava.com/activities/11465664206 https://zwiftpower.com/events.php?zid=4386813 (brutal all the way, very selective, solo effort last part to get a result)
Last weekend was a FRR Charity Event day '24 Hours Atop VenTop' when riders all focused on ascending (+decending) Ventop as many times as they could within 24 hours for charity/fundraising/vEveresting/vCingles/biCingles.
Join Haydn 'Roady' and get inspired for your next workout
www.strava.com
I'd planned 3 ascents myself, with possibly an aim at doing them in 6 hours. I hadn't got the time for any real training (apart from a 4-7 hour ride outdoors the weekend before), nor any real aim to do 24 hours as anything over 6 hours on Zwift would also be my longest ride on the platform. 3 ascents of Ventoux outdoors (as there are 3 different ascents) is a challenge called '
Club des Cingles du Ventoux' (translates to the 'Mount Ventoux Crazy Club' or similar!) where you descend to each of the climb starts and almost have a Brevet card to get stamped in each village, then you climb back up the mountain from that side. With only 1 ascent of VenTop on Zwift, although it has a 'loop around' at the top, crossing the finish banner is enough to then do a U turn - as is descending - although no loop there, you have to make sure you've passed the segment start point and then U-turn. It's a very nondescript part of the course with very few markers. Thankfully if you freewheel the whole descent (for anyone over 65kg) you'll 'naturally' roll over this line. So with it being a 15+ minute descent I took the opportunity to 'step away' from the bike. Eating, stretching, toilet break, kit changing etc. This was massive for me - the kit changes and getting off the bike stopped me suffering (too much) from saddle pain & sores. I was still utterly spent the 3rd time up - having to settle into 'just rolling' a recovery pace to keep going several times. I'm certainly capable of a sub 7h for 3 ascents maybe even a sub 6h with some real training... But also knowing I've done a 'half vEverest' (or basecamp...) that will be more the plan/challenge to aim for the next time I do anything like it (which I will need to train and plan a lot more for - as probably at least 10-12 hours on the bike).
For those of you with a power meters and a smart trainer. Which do you use? I feel like in ERG mode my set up is still really erratic but I'm starting to feel like a lot of this mess was my own doing.
My set up was Wahoo Kickr as the controllable, Assioma duos as Power/Cadence but the result would often look like this.
The watts would be all over the place. It was really difficult to stay steady. What would also happen is that for some reason I'd be spinning around 100-110rpm so I'd have to stop for a few seconds to give it a chance to get back down to 80-90rpm which is my comfort zone. Didn't matter which gear I was in, it would still slowly climb the RPM up to unsustainable numbers and before I knew it I would be back in 52x11.
<snip>
Am I right in thinking that using both the trainer and pedals together were complicating things and for the sake of ease, I should just leave everything to the trainer?
You got to your own conculsion here are you are right in assuming the trainer in ERG and using a different power source is the cause. Basically when using your trainer as ERG it 'knows' what resistance to apply for any given cadence from you. It's accurate as it is controlling everything (which is why the power curves are so smooth), it doesn't have to fluxuate much. When you're using an 'outside' power meter, it's adjusting the trainer resistance to 'meet' the output from that powermeter, so is constantly adjusting (as the power meter is constantly measuring - even with smoothing set). Factor into that some trainer-delays to response (due to ramping/power curve), some delays of the internet latency, then the other way - the power changes for an interval from your platform back the other way... There's 'too much to go wrong' so is very hard for it to be smooth - even for a rider with perfectly smooth cadence and power delivery through a large part of their pedal stroke.
I'm a bit confused by this. For me, ERG ensures a consistent power. Watts = Cadence x force. I decide the cadence, the ERG sets the force needed to produce the Watts necessary. There's no point in changing gears. Also, cadence is then down to you, no? If it wants 250W and I pedal slow, the pedalling is just harder to keep the 250W.
Correct, if anything a rider changing cadence 'throws' the ERG out further, as the trainer is having to do more adjustment. But if anything, due to the power ramp/curve of a trainer, if you drop a couple of gears when finishing a hard interval the trainer is having to change 'less' so the difference is quicker to 'apply' (it doesn't have to change so much resitance). You can do the opposite at the start of an interval by changing up a few gears - you're basically shortcutting the resistance it needs to apply at the given cadence, so less change = quicker it's applying the right resistance for the interval. It 'catches up' faster.
Some trainers have a quicker/faster power curve so are 'better on Trainer Road' (like many of the Saris and Cyclops ones) as they're better ERG trainers. Most of the others are better ERG at certain 'speeds' - that's flywheel speed - which is semi-linked to the gearing you're in. Usually faster is easier for it to apply resistance to the flywheel and meet the power 'target'.
I don't know why you wouldn't just leave all the ERG/power stuff to the kickr when you are on it. The only issue I ever have with it is when I pause for a second or it disengages the ERG mode it sometimes takes longer than I would like to pick it back up.
Yup, 'ERG Spiral of death'. Some trainers (older Tacx) the power curve was so steep it would feel like 'hitting a wall' if you dropped some cadence - it basically applying more and more resitance to meet the power target. Most units (and even the controlling softwares) these days have an 'ERG pause' or more smoothing built in so the riders stands a chance when they drop cadence to not hit a 'wall'. The KICKR has always semi had this through the bigger flywheel, you drop that momentum you 'feel' it - which is why many racers like it and the 'road feel' has always been good compared to others.
My original line of through would be that I would have reliable power numbers both indoors and outside and the pedals are +/- 1% rather than the +/- 2% of the Kickr. Though it very much looks like I've overcomplicated things. Shock
Yup. But thinking into it too much too... Don't stress about a 1% accuracy difference between 2 power measurements which are either side of a drivechain. They'll never be that close when you factor other things in... Chainline (gear choice) can be a few %, a dirty chain or not enough lubrication another few %, a worn drivechain another few %. A good gear combo and efficient selection for the given resistance a few % the other way. A flexy shoe/slipping cleat another % loss. Maybe temperature changes since the last spindown/calibration another few %.
So your trainer being 2% under and your powermeter 1% higher - although that doesn't only translate to a 3% difference in their readings (my maths is failing me at this point), so them reading 5% difference is actually probably still within tolerances and all the other stuff thrown in. Even as much as 5-10% (or more) when doing a short interval with all that factored in, doesn't really have to mean either of them has to have a problem...