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Rivian's TM-B electric bike

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190 points hasheddan | 2 comments | 22 Oct 25 18:00 UTC | HN request time: 0s | source
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dreamcompiler ◴[22 Oct 25 19:10 UTC] No.45673731[source]▶
808Wh battery and 100 miles of range. These two numbers track with each other and are roughly believable.

OTOH, with a battery this big, a generator powered by the pedals, and regen braking this thing has to be heavy. I'd expect it to weigh at least 80 lbs. More likely 100. The fact that their "specs" say nothing about weight suggests they're embarrassed about the weight.

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jeffbee ◴[22 Oct 25 21:22 UTC] No.45675314[source]▶
Regen braking is how you can tell this was designed by a moron. The energy balance simply does not favor regenerative braking on a bicycle, especially a bicycle that flippantly ignores aerodynamics like this one does. A bicyclist loses roughly all of their energy to air resistance. It's not a truck. There is not substantial potential energy to be recaptured going down hills.
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1. Izikiel43 ◴[22 Oct 25 22:58 UTC] No.45676215[source]▶
> The energy balance simply does not favor regenerative braking on a bicycle

Here in Seattle with all the hills it might

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2. skeeter2020 ◴[23 Oct 25 04:19 UTC] No.45678132[source]▶
it has nothing to do with the hills; it's the mass and the power output of the system. Bicycles are light and humans (even with electric pedal assist) are weak.