ALL Electric eMTB · Not tested by Will
Biktrix Juggernaut Ultra Duo 4: specs and how it compares
Not tested. Will hasn't ridden this bike. Specs come from Biktrix's own site, written in our words, and each one is linked below. For bikes he has tested, see the reviews.
Class: Biktrix ships it limited to 20 mph and 500W, and the limits can be reprogrammed. Raising them takes it outside the e-bike classes. E-bike laws by state
$3,499
Price as of Oct 26, 2026 on Biktrix's site. Some options available, some not, on 2026-10-26.
Our take
The Juggernaut Ultra Duo 4 is a mid-drive fat-tire hardtail. Its 160 Nm motor is among the strongest you can buy and suits steep climbs and heavy riders. The 75 lb weight excludes the battery.
Closest bike Will has tested
Aventon Aventure 3
Will reviewed it: an off-road-capable e-bike he filmed.
Read Will's reviewSpecs
| E-bike class | Programmable (ships limited to 20 mph and 500W) |
|---|---|
| Motor | Bafang Ultra M620 1,000W mid-drive, 160 Nm |
| Battery | 910 Wh (52V 17.5Ah) internal; optional extender to 1,794 Wh |
| Claimed range | Up to 90 mi (maker's figure) |
| Weight | 75 lb without battery |
| Max payload | 380 lb |
| Brakes | Dual-piston hydraulic discs, 180 mm rotors |
| Suspension | RST Guide fork, 75 mm; rigid rear |
| Tires | Chaoyang 26 x 4 in or 27.5 x 3 in |
| Gears | Shimano Alivio 9-speed |
| Pedal sensor | Cadence and torque sensing |
| Rider height | 5'6" and up |
Biktrix ships it limited to 20 mph and 500W, and the limits can be reprogrammed. Raising them takes it outside the e-bike classes. Check e-bike laws in your state.
Versions
- Step-over: $3,499
- Powder-coated: $3,849
Compared with similar bikes
| Biktrix Juggernaut Ultra Duo 4not tested | Ride1Up Turris | Aventon Aventure 3 | Aventon Ramblas | |
|---|---|---|---|---|
| Price | $3,499 | $1,395 | $1,999 | — |
| Motor | 1000 W | 750 W | 750 W | 250 W |
| Torque | 160 Nm | 90 Nm | 80 Nm | 100 Nm |
| Battery | 910 Wh | 672 Wh | — | 708 Wh |
| Weight | 75 lb | 54 lb | 76 lb | 54 lb |
| Payload | 380 lb | 300 lb | — | — |
| AEB Score | 6.5 (provisional) | 7.6 | 6.3 | 7.2 |
Specs for the other bikes come from their pages on this site; ones marked spec profile haven't been ridden by Will. Prices change, so check the review page for the latest.
What owners say
We haven't gathered enough owner reviews from sources we trust yet, so there's no summary for now.
Sources
- biktrix.com, specs checked Oct 26, 2026
Page updated Oct 26, 2026.