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Road Cycling It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle. -- Ernest Hemingway

Kickr ?

Old 12-17-16, 09:01 AM
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RShantz
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Kickr ?

For those of you with Kickr's (preferably this year's version), how does it work when going from 125W to 400W in ERG mode? Then how well does it go back down (400 to 125).


I've heard some complaints that there's a definite lag while doing intervals. Enough so that it makes short duration (30 -90 seconds) intervals hard to do correctly - that you just reach the prescribed power when the interval is just about over then a gradual decrease. They say the interval start/stop is more of a mountain than cliff.
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Old 12-17-16, 09:45 AM
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Da Reef
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There is a lag but it's hard to tell if it is the Kickr or the software. I recall a Trainer Road podcast where they talk about the lag. I recall that they've built in a lag or else some of the intervals would be impossible. Your legs can't adjust as fast as the software/trainer.

Some of the perception of a lag also has to do with the flywheel momentum. They talk about this also on the podcasts. The faster the flywheel spins the more momentum it will carry into the ramp up.
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Old 12-17-16, 09:50 AM
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Originally Posted by Da Reef View Post
There is a lag but it's hard to tell if it is the Kickr or the software. I recall a Trainer Road podcast where they talk about the lag. I recall that they've built in a lag or else some of the intervals would be impossible. Your legs can't adjust as fast as the software/trainer.

Some of the perception of a lag also has to do with the flywheel momentum. They talk about this also on the podcasts. The faster the flywheel spins the more momentum it will carry into the ramp up.


Thanks a bunch. That's what an acquaintance said - was just looking for outside confirmation. He said things worked much better doing workouts Zwift as compared to TrainerRoad. You just have to program the custom workouts on Zwift since they are not already there.
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Old 12-17-16, 10:02 AM
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Trainer road software works, it's just a bit more complicated and you may want to understand what they are trying to achieve. Their podcasts do a great job explaining the thought that went into the design.

If you pick an easier gear you will spin the flywheel slower and you will feel the ramp up more. I don't know how enjoyable intervals of 125 to 400 would be with no flywheel inertia and no ramp up...
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Old 12-17-16, 11:03 AM
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I know what you mean about 125 to 400 w/ no ramp up, but he was saying 30 seconds to ramp up on Trainer Road. That would be pretty long while doing short duration intervals.
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Old 12-17-16, 11:27 AM
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I have a gen 1 Kickr, but the ramp to 125 to 400w takes about 3-4 seconds. The drop also would be around that or worse, since depending on the speed of the flywheel, it takes some time to stabilize so there would be very little resistance due to the flywheel spinning. This ramp down could be alleviated slightly if you rode at a very low speed so the flywheel has little inertia.

I would not recommend doing very short intervals on erg mode. I don't think it is the fault of the trainer or the software, it just isn't really practical to increase watts that fast. A very fast increase in resistance would feel like you hit a wall (which on occasion you feel on the Kickr when the software bugs out and the brake locks up for a second).
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Old 12-17-16, 11:44 AM
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Originally Posted by RShantz View Post
I know what you mean about 125 to 400 w/ no ramp up, but he was saying 30 seconds to ramp up on Trainer Road. That would be pretty long while doing short duration intervals.
I think he's saying the ramp up makes a 30 sec interval almost pointless. You can easily ramp up the cadence ahead of a short interval and carry enough inertia to noticeably take the edge off a high power effort. But this isn't necessarily pointless and has value depending on what you are trying to achieve.
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Old 12-17-16, 11:49 AM
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I find the ramp-up too quick, and the ramp-down not quick enough

In all seriousness, on my Kickr gen-2, it seems almost instantaneous...I've not perceived a significant lag at all.
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Old 12-17-16, 12:38 PM
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Would be nice to see these discounted around Christmas. Any hope for that?
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Old 12-17-16, 12:42 PM
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You've already missed the window. Pretty much all trainers were on sale around Thanksgiving. Most good online sales are over now.
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