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2021 Moustache Off 4 Open – 625Wh



New frame design

If you’re looking for true versatility look no further than the 2020 Moustache Off 4 Open. The brand new 2020 Off 4 Open with an ultra-low step-through frame provides industry leading accessibility with the stiffest Off 2 frame Moustache have ever produced.

Whether you’re looking to get off the beaten track, climb mountains or simply get some fresh air on the everyday commute the Off 4 Open will not disappoint. Stable and confidence inspiring geometry combined with a comfortable riding position means long days in the saddle leave you wanting more, not feeling sore. 

New Bosch motor and battery

As happy in the forest as it is in the urban sprawl there aren’t many places the Off 4 Open doesn’t excel. Bosch’s Performance Line CX motor offers dynamic, powerful and quiet assistance. The motor’s high torque (85Nm) means the motor seamlessly assists you, even up the steepest of climbs. Rounding out the package, Moustache’s stealthily integrated battery gives the Off 4 Open a clean aesthetic whilst also being easy to remove, carry and charge. 

Integrated Parts

The Moustache Off frame is further compatible with the unique “Moustache Tour Kit” including mudguards and an integrated rear luggage rack. Exclusive tubular Moustache mud-guards, ultra solid and reliable, are perfectly centred over the wheel to keep you and your bike dry and clean in all conditions.  With the rear rack incorporating the QL3 system, Ortlieb by Moustache panniers can be attached in seconds, giving the Off even more versatility. Its wide platform also makes it compatible with a large range of child seats. The MIK integration further allows for quick fitting of a wide range of Basil bags and accessories, with more brands coming soon. 


  • Moustache’s new, industry-leading, open-frame design
  • Bosch’s Performance Line CX Motor provides efficient, intuitive and near-silent power delivery
  • Bosch’s 625wh Powertube Battery is the most efficient unit on the market, meaning more ride time between charges!
  • Unique Moustache design allowing for integration with mudguards and rear luggage rack with several pannier options
  • SRAM’s SX 12spd Drivetrain gives you a wide range of gears and perfect shifting every time
  • Shimano’s MT400 Hydraulic Brakes providing powerful brake control
  • Moustache’s Dropper Seatpost means you’ll be riding in comfort


– Model
Moustache Off 4 Open
– Frame
6061 T4-T6 Alloy, variable thickness hydroformed tubes, Bosch PowerTube battery integration (Horizontal), integrated cable routing
– Fork
RockShox, Recon TK, w/external rebound, TurnKey lockout, 120mm travel, 15x110mm, Boost, 46mm Offset
– Motor
Bosch, Performance Line CX 250W – 85 Nm, higher dynamics in response and agility – Weight & form factor reduction
– Battery
Bosch, PowerTube 625Wh
– Charger
Bosch, 4Ah
– Display
Bosch Purion – 5 modes (Eco, Tour, eMTB, Turbo, Off) – « Walk assist »
– Rear derailleur
Sram, SX Eagle, 12-speed
– Front cog / Chainring
Sram, SX Eagle, 34T, direct mount
– Cassette
Sram, PG1210 Eagle, 11-50T
– Chain
Sram, SX Eagle, 12-speed w/Powerlock
– Shifters
Sram, SX Eagle, Trigger 12-speed, Single Click
– Crankset
Moustache, Alloy, 170mm
– Brakes
Shimano, MT400 hydraulic disc brakes
– Rotors Front/Rear (in mm)
Shimano, 180mm front & 160mm rear
– Hubs
Front = Shimano, 32H, 15x110mm, w/thru axle
Rear = Shimano, 32H, 9x141mm, w/QR
– Rims
Moustache, Alloy, double wall, 32H
– Tires
Maxxis, Rekon 27.5×2.80
Other Components:
– Saddle
Moustache, Ergonomic
– Seatpost
Moustache, dropper-post w/remote lever, 31.6mm Size S= 305mm w/80mm travel Size M/L= 365mm w/120mm travel Size XL= 425mm w/150mm travel
– Seat clamp
Moustache, Alloy 34.9mm
– Handlebar
Moustache, Alloy 740mm, 15mm rise, 9° backsweep, 5° upsweep
– Stem
Moustache, Alloy 70mm
– Headset
FSA, No 57B
– Grips
Ergonomic, dual-density
– Pedals
Resin with plateform and reflectors
– Warranty
5 years frame and fork – 2 years motor, battery (or 500 cycles) and accB23:C41essories
– Sizes
Small, Medium, Large
– Color
– Weight
– See range of Off models – here