Kalkhoff Pro Connect S27 Review

Kalkhoff Pro Connect S27 Electric Bike Review 1
Kalkhoff Pro Connect S27
Kalkhoff Pro Connect S27 36v 14ah Battery
Kalkhoff Pro Connect S27 350 Watt Motor
Kalkhoff Pro Connect S27 Sram Dual Drive
Kalkhoff Pro Connect S27 Magura Hydraulic Disc
Kalkhoff Pro Connect S27 Lcd Display Console
Kalkhoff Pro Connect S27 Electric Bike Review 1
Kalkhoff Pro Connect S27
Kalkhoff Pro Connect S27 36v 14ah Battery
Kalkhoff Pro Connect S27 350 Watt Motor
Kalkhoff Pro Connect S27 Sram Dual Drive
Kalkhoff Pro Connect S27 Magura Hydraulic Disc
Kalkhoff Pro Connect S27 Lcd Display Console


  • Urban commuter bike with efficient Panasonic mid-drive motor capable of higher top speeds (25+ miles per hour)
  • High end features including Magura MT4 hydraulic disc brakes, SKS fenders, rack with mini-pump, integrated LED lights
  • Unique 27 speed drivetrain uses nine cassette sprockets and a three speed internal gearing system

Video Review





Pro Connect S27


$4,199 USD

Body Position:


Suggested Use:

Commuting, Urban, Touring

Electric Bike Class:

Speed Pedelec (Class 3)
Learn more about Ebike classes


3 Year Frame, 2 Year Motor and Battery


United States, Europe

Model Year:


Bicycle Details

Total Weight:

54 lbs (24.49 kg)

Frame Material:

Aluminum Alloy, Internally Routed Cables

Frame Sizes:

21.65 in (54.99 cm)23.62 in (59.99 cm)

Frame Types:


Frame Fork Details:

Verso III Magnesium Air Suspension with Remote Lockout

Attachment Points:

Rear Rack Bosses, Fender Bosses

Gearing Details:

27 Speed 3x9 with SRAM Dual Drive

Shifter Details:

Triggers on Left and Right Bar


Satori UP2, Adjustable


Concept EX Riser, Oversized

Brake Details:

Magura MT4 Hydraulic Disc


Ergon, Ergonomic


Fizik Rondine

Seat Post:

Concept EX


Black Jack XC400 Hohlkammer

Tire Brand:

Continental Top Contact, 700 x 42c

Wheel Sizes:

28 in (71.12cm)

Tire Details:

Kevlar Lined


B&M Lumotec CYR R IQ LED Headlight with B&M Toplight Taillight (Powered by Battery Pack), Bell, SKS Fenders, Concept Spring Rear Carry Rack with Mini Pump Attached, Chain Guard, Pletcher Spring Loaded Kickstand

Electronic Details

Motor Brand:


Motor Type:

Mid-Mounted Geared Motor
Learn more about Ebike motors

Motor Nominal Output:

350 watts

Battery Brand:


Battery Voltage:

36 volts

Battery Amp Hours:

14 ah

Battery Watt Hours:

504 wh

Battery Chemistry:


Charge Time:

5 hours

Estimated Min Range:

40 miles (64 km)

Estimated Max Range:

55 miles (89 km)

Display Type:

Monochrome LCD


Speed, Odometer, Battery Capacity, Assist Level

Drive Mode:

Torque Sensing Pedal Assist

Top Speed:

25 mph (40 kph)

Written Review

The Kalkhoff Pro Connect S27 uses the Panasonic E-Performance mid drive system offering excellent climbing ability and great range. This Euro style electric bike comes with fenders, rear rack and lights powered off the main battery but delivers more power and speed for a US market. While it does not offer a throttle mode, the torque sensing pedal assist is responsive and combined with the larger battery capacity, perfect for touring or longer commutes. Unfortunately I was unable to film a test ride on this ebike but the video review does show the main components.

The motor offers 350 watts of power, which is a lot for a mid-drive system. It’s made by Panasonic and uses a combination of torque and cadence sensors to provide smooth and powerful acceleration. Unlike many other Kalkhoff ebikes, this one delivers higher top speeds in excess of 25 miles per hour. The weight of the motor is kept low and centered on the frame, improving balance, and the front sprocket is nearly enclosed by a chain guard that will keep your pants clean and snag free.

The battery pack is also mounted low and central on the frame. It’s removable for easy charging, or lifting during transport, and uses Panasonic cells. The chemistry is Lithium-ion which delivers high energy density, meaning it can be lighter weight while offering the same capacity and power. The pack offered with the Pro Connect S27 provides 36 volts of power and 14 amp hours which is quite a lot. This bike can reach 65 miles in pedal assist mode (depending on rider input, weight, terrain and weather).

The neatest feature of the S27 in my opinion is the unique gearing system in the rear hub and cassette. In order to achieve a higher number of gears, 27 in this case, they combined 9 sprockets with 3 internal gears. Most 27 speed bicycles will do 9 sprockets in the rear with 3 rings where the cranks are, at the bottom bracket. This is a challenge with mid-drive electric bikes because the motor occupies space at the bottom bracket, where a second derailleur might otherwise sit. It might also pull too hard or make a front gearing system too vulnerable so this rear solution is quite ingenious.

Although my time with the Pro Connect S27 was limited, I could tell the quality and feature set was top notch. Having ridden other Kalkhoff designs, I can say that their craftsmanship is solid. Currently their availability in the US is limited but that may change in the coming years. There are very few high speed mid-drive electric bikes to begin with but even fewer that are setup for commuting or touring. The suspension fork, ergo grips and handlebar combined with the fenders, rack and lights makes this a functional ride but one that won’t stand out or look too much different from an ordinary bike and that might be a good thing if you’re cruising at higher speeds :)


  • Built in seat post shock pairs nicely with Verso III Magnesium suspension fork to smooth out the ride and add comfort
  • Front and rear lights are powered by the main battery pack for easy use and less waste with disposable batteries
  • Excellent range due to torque sensing pedal assist system that requires rider input to go
  • light weight Lithium-ion battery pack mounted centrally on bike keeping weight low and centered
  • Great combination of extras including front and rear fenders, LED lights, adjustable stem, swept back handlebars, ergonomic grips, chain guard, standard gauge rear rack, built in pump and kickstand
  • Solid two year warranty, bike is made by Kalkhoff which is part of Derby Cycle Werke, one of the largest German ebike manufacturers with a solid reputation
  • Keyed battery pack locks to frame and is removable for improved convenience when charging
  • Larger 350 watt motor is a capable climber and provides higher speeds (up to 28mph) due to speed pedelec design


  • Offers torque sensing pedal assist mode only, no twist or trigger throttle
  • Bolt-on style rack require proper assembly and maintenance to avoid rattling loose over time vs. welded but the Kalkhoff hardware seems very high quality
  • Very limited availability in the USA, harder to test ride, service and honor warranty as a result
  • Regardless of the amazing features and unique gearing, this bike is pretty expensive


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Comment (1) YouTube Comments

10 years ago

Looks like an awesome commuter, would have loved to test this next to my Stromer Platinum. I’m really happy with the Stromer, but I am curious. Thanks for the review, hopefully you get a chance to do a proper road test as well.


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