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TRed’s wild fixed-gear regenerative BestiaNera Hybrid Streetfighter urban e-bike

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We had a chance to get a look at TRed’s BestiaNera Hybrid Streetfighter when the bike maker happened into our EU home city of Prague to debut its custom steel and titanium CrossBeasts with their sponsored pro Czech racer Luboš Pelánek. The BlackBeast is pretty unique – beside the literal horns on the tips of the bars – in that it is the rare combination of a fixed-gear and an e-bike. While that seems about as crazy at first thought as you’d expect from looking at the bike, it actually makes a bit of sense. The e-bike motor & battery, completely enclosed in the rear wheel, work together to both deliver power assist to the pedals and use the wheel braking action of the fixed drivetrain to return energy into the battery…

In addition to being a fixed-gear e-bike the BestiaNera also lays claim to being the first hybrid e-bike to come in under 10kg/22lb. There the simplicity is a big driver, as it’s easy to keep the weight down with all the extra components of more complicated e-bike drivetrains.

The motor itself is in the hub of the lenticular disc rear wheel, with technoogy developed with Zehus. The power supply is a regenerative KERS system that converts braking force back into electrons to recharge the lithium-ion batteries housed in the wheel around the hub or supplies assist power as needed. The e-bike pedal-assist output level gets controlled via a mobile app over a Bluetooth connection and offers 7 assist levels so you can control how much power it adds on. No wiring. No external battery.

Besides simplicity of the e-bike system keeping weight low, Tred adds a light carbon fibre monocoque frame to boot. The frameset itself was built with stiff power transfer for time on the track, so is up to the task of the extra power at the rear wheel.

While braking via the pedals through the fixed drivetrain will both slow you down and recharge your battery, a hydraulic disc brake will bring you to a proper stop quickly if need be. Tred worked to get an aero 3-spoke wheel that uses a modular hub design so they could include a 6-bolt front disc brake.

This ‘sport’ version of the beast gets a set of pursuit bullhorn bars with their own soft rubber horn extensions, but an ‘urban’ build of the bike also offers a set of short flat bars and a height-adjustable stem for a more upright position to tool around town. Tred will even stick on a set of powerful LED lights for visibility day or night.

Even though power transfer is track  bike stiff, Tred claims the build in a patented SMAAVS anti-vibration system in the carbon frame that boosts comfort for everyday rideability. The BestiaNera is also available in a lower tech version with either a single speed setup or 2 speed internally geared hub.

The BestiaNera Light+ (which is the simpler setup of the hybrid versions with a spokes rear wheel) has a retail price starting at 6500€. That goes up for this one which is the top Streetfighter, or the Urban+ or Sport+ versions that also get a mix of trispokes and disc wheels hiding the spokes and the rear 250W hub motor.

TRedBikes.com

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23 Comments
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Heffe
Heffe
5 years ago

As an everyday bike, how would that rear wheel deal with a nice crosswind? It looks like you’d go sailing like a kite!

Dirka
5 years ago
Reply to  Heffe

The effects of the tri-spoke up front will be much more dramatic. You usually can get away with a disc in the rear since it’s not steered and you’ve got most of your weight on it.

r0b0tat0ms
r0b0tat0ms
5 years ago

“You’ll poke your eye out, kid!”

Those are some legit ‘bull horns’. Yikes.

Dustin
Dustin
5 years ago

But doing sweet skids won’t charge the battery!

JMAN
JMAN
5 years ago

All that for a max speed of 25kph in non-windy conditions…

fred
fred
5 years ago

what a joke. do people make dumb crap like this just for the giggles? a $7000 bike with a 15 dollar rear tire. should have given these guys a spot on april 1st.

Dhbomber
Dhbomber
5 years ago

Wow….not a single “hipster” comment. What a relief! Hate the bullhorns though…

dockboy
dockboy
5 years ago

They couldn’t source a brake lever designed for that handlebar style, so they went with Avids? They really don’t want you slowing yourself with a brake.

FFM
FFM
5 years ago
Reply to  dockboy

Second this as well as Fred’s comment about the tire. Don’t ride it anywhere windy, hilly, or bumpy so… No urban riding.

Pete
Pete
5 years ago

Great, now track bikes will have to be tested for motors too.

jasonmiles31
5 years ago

I think this is a really cool combo. I wonder what max regen wattage is? I would prefer more of a coaster brake regen setup though.

Dylan
Dylan
5 years ago
Reply to  jasonmiles31

It could work fairly neatly as a fixed gear if the wattage (both regenerative and assistive) was proportional to the torque being applied at the cranks. Stomping on the pedals up a hill? – max assistance. Spinning out on a descent? Zero assistance. Applying backwards force through the cranks to stop in a hurry? Maximum regenerative braking.
Sure it would be nicer with a proper tt hydro lever, but who is actually making one other than the Dura Ace 9180?

Jan Sæther
Jan Sæther
5 years ago
Reply to  Dylan

TRP TT Hydro:comment image

dontcoast
dontcoast
5 years ago

As someone who loves track bikes and urban e-bikes, I am befuddled and slightly terrified.

…unless it’s some sort of coaster brake/ fixed gear hybrid, it sounds deathy AF.

And even if it is rideable, it is certainly silly. no problem with silly though.

Kernel Flickitov
Kernel Flickitov
5 years ago

Could be a sick pursuit bike.

Drakkkesy
Drakkkesy
5 years ago

$600 taiwanese carbon frame
$500 taiwanese carbon front wheel

$1500? For the rear regenerative disk

6500 euros for the entry level edition?
Laughing all the way to the bank

lop
lop
5 years ago

Nope.

JRF
JRF
5 years ago

This is the worst thing I’ve seen today and I just read the article on the Bugatti bike on BikeRadar.

-Rizza
-Rizza
5 years ago

1. What’s carbon “fibre”?
2. What’s “technoogy”?
3. “There the simplicity is a big driver, as it’s easy to keep the weight down with all the extra components of more complicated e-bike drivetrains.” Does this sentence mean, ebikes are easy to keep light?

This eArticle needs an eEditor.

mwagner
mwagner
5 years ago

If you could just remove that 25mph limiter and add some aerobars on that thing, you could start mopping up the local time trials.

maciek
maciek
5 years ago

love the front set up with Tubular tire such good idea for city Ebike

Matt
Matt
5 years ago

Tardcycle

fred
fred
5 years ago

jokecycle

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