rockers for bike erg base

Discuss all things related to the BikeErg, Concept2's newest product.
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borgnes
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rockers for bike erg base

Post by borgnes » June 2nd, 2018, 5:35 pm

Has anyone come up with a simple and solid "rocker plate" design for the Concept bike erg? It seems like it should be easier to make something for this erg than for a regular bike on a smart trainer.

I suppose that the easiest thing would be for Concept2 to design and sell rockers for the base of the erg that simply bolt on. Just remove the short base pieces and add the rockers. Someone who's got a woodshop could make some out of wood once they figure out what the optimal rocker curve would be - but I'm not that guy.

Any ideas for a good simple design?

Dreadnought
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Re: rockers for bike erg base

Post by Dreadnought » June 3rd, 2018, 7:57 am

Rockers for simulating side to side bike lean?

Should not be too hard conceptually, but the implementation is another matter, i.e. to make it safe, making sure it stays firmly bolted on, and with a wide enough base to make sure it doesn’t tip over.

borgnes
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Re: rockers for bike erg base

Post by borgnes » November 28th, 2018, 10:46 pm

FWIW, I made up some rockers out of closed cell foam first and out of wood later and attached them to the bike erg.

While seated and pedaling, it's definitely much better because it varies the pressure points on your seat while pedaling and it just feels more comfortable and realistic. While standing, it's not a good solution because the bike leans the opposite way of how it does in real life and at a different rhythm.

The solution for a bike erg company like Concept2 would be to create a pivot point on the bike erg at some distance above the floor, maybe around the height of the bottom bracket, and have some sort of pendulum swinging underneath so that the bike erg stays upright and keeps coming back to its center upright / neutral position. At least, I think that's where the pivot needs to be.

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