4 Pack Indoor Cycling Snap Rocker Feet Adapters with 8 Pack Tennis Balls, Stability Accessories for Smart Bike Resistance Trainer Home Workout Equipment

High quality product solves the static pressure experienced on the Kickr Core trainer. Use softens the ride and allows the bike to move naturally as you pedal. Many complaints here about difficulty to install but I removed the caps from the legs first and inserted them into the feet before soaking a few minutes in hot tap water. I spritzed each leg with glass cleaner and tapped them gently into place. The comfort on the bike increases noticeably and feels natural when out of the saddle. I highly recommend this product

I first came across this type of product on a subreddit, with most people saying that they had 3D printed their adapters. I was therefore wary of paying for something that was weak and would probably break in a few months.I'll echo what others have said about these adapters-- they do not appear to be 3D printed and are of much better quality than I expected. I got these for my Wahoo Kickr Core. Are they a game-changer? No, but they do provide a little more movement on the trainer, and the ride feels a little more natural.As others have said, it was tough to get them on. I had to spray the inside of the adapters with an alcohol-based hand cleaner (to reduce the friction between the rubber feet and plastic adapter) and then use a mallet to lightly hammer them into place. But i think tighter is better than having them too loose, as too loose might eventually lead to them popping out. My only gripe (which is nitpicking at this point) was that the tennis balls provided didn't pop into the adapters and stay there, you have to hold them in place until you place the adapters back on solid ground. That being said, well worth the $40 that i paid for them.

Functionality:The tennis balls don't stay in when I move my trainer, so I have to chase and collect tennis balls as they roll away. But once your setup this is a good solution for a more realistic cycle feel.click in

Sturdy, solid and thick plastic pieces. When I first tried to put them on I thought I needed to return them. No way to get them on and doubted that it would even go on with lubricant. Came back here to read some recommendations. I used a very low solid content hand lotion and a flat piece of wood and a hammer (the solvent, e.g water and some alcohols will evaporate and it will not come off anymore). Not too hard to get them on that way.I am using this on the Kickr Core. The added give and movement in the saddle are subtle but welcome. It definitely makes a difference for me when getting out of the saddle at high power. Nice!

Works well and was surprised to find it comes with (unbranded) tennis balls included. I was expecting to have to buy those separately.

Wanted to love this but they didn't fit correctly on the Kickr Core. They were too tight and would not go on all the way. I would have to use a hammer to get them on all the way and then would never be able to get them off.

As other reviews mention they are difficult to install unless you spray or wipe on some wd40 or equivalent. That’s an old trick from installing grips on my bmx bike 40 years ago. I do like the setup, there is just enough give to provide a more dynamic feel. I didnt realize how rigid the setup was without them.

I missed the part that says these only work with the Kickr Core. Fortunately, I have access to cnc routing and materials to create some spacers to allow this product to be used on the 3-legged Kickr. The product is well made. I have been using them for 6 weeks during the base & build phases of my training plan. Haven’t done any sprint work on them, but for my 1st time ever I rode on the trainer for 3 hours. Prior to, my max was 90 minutes. I attribute the increase to the comfort the balls provide.