My new Kickr works great except sometimes on hard efforts front wheel is moving around since don't use a riser block (wheel just sits on the ground)

Any solutions people have come up with?

One solution I've heard of is called a riser block.

sit-n-spin.

Honestly, what do you weigh? It probably just requires some work on your technique, unless you are just grossly overpowering the bike.

We really like the Cycleops version.. it has 3 heights and a really wide base that holds the wheel nicely. Might be able to find one on CL or Ebay cheaper. We have the Kinetic ring too which is what I was using until we got the other one.

Riser blocks don't work with the Wahoo kickr They bring front off the ground and therefore bike is sitting at the wrong angle while attached to the trainer. Need something that keeps front flat but stops it from moving side to side

The Kinetic ring gets the bike level with my Kickr, with 700c and 650b.

Wow! You sir, are a powerhouse. My bike doesn't budge one bit. I cannot even imagine it happening while I'm riding it.

Maybe if you relaxed your upper body...

Yeah, well, the front end moves on bearings, so it’s to be expected, is ‘t it? I don’t find a little wiggle annoying, and in fact I kind of like it; maybe it makes it more dynamic? Anyway, I know what you mean, as I also regularly ride a Cycleops 300PT dedicated stationary, which is rock solid, and in some ways, a more training specific tool for it, rather than a ride simulator like Kickr/Zwift. I also used to use a Cyclops Fluid2 and their riser (pictured) above, but would often just use a book rather than the riser just because I preferred the more natural feel of some movement at the bar.

Try deflating the front tire a bit to get a bigger contact patch, and if you’re on a hard surface, try a small piece of carpet under the front wheel, or a piece of that rubberized mesh used under rugs to hold them still.

Maybe that would be a bad idea. If you anchor the front wheel, you're still going to be putting the forces on the bike that previously moved the wheel only now the forces are stressing the bike somewhere else.

Put a piece of plywood under the Kickr to even it out.

It's a feature, not a bug. The bike doesn't need to be clamped to the floor, as long as you don't throw it to the ground.

[edit: ours is on a concrete floor, and we put a small, flattened corrugated box under the front wheel so it will twist a bit without wearing the tire.]

Check out our BFer here, especially around 2 minutes in:

Here's a vegan cyclist rocking a sprint with a Kurt Kinetic (around 12 minutes):

And Chad McNeese built a custom base to add more rocking to conventional trainers:

Mine sits on a rubber mat and I don't feel that much movement at all.