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Rivian's TM-B electric bike

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190 points hasheddan | 1 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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Spunkie ◴[22 Oct 25 22:10 UTC] No.45675805[source]▶
I find regen exciting for it's ability to slow down my brake pads getting shredded every month. The fact that I get some energy back from it is mostly a bonus.
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nradov ◴[22 Oct 25 23:21 UTC] No.45676411{3}[source]▶
How are you shredding brake pads every month?
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1. azundo ◴[23 Oct 25 01:33 UTC] No.45677223{4}[source]▶
It wasn't quite monthly but on my radwagon 4 I would change the pads every other month at least. Hauling two kids around SF on a heavy bike plus a little bit of poor design on Rad's part.