Product Comparison: Sigma Sport BC8.12 vs VDO M4

General Specifications
About the Product
The SIGMA BC 8.12 provides the essential cycling functions as well as average speed, max speed and total ride time. It features straightforward single button operation and a large, easy to read, full text display.
The VDO M4 cycling computer 2016 is a perfect tool for road bike and mtb, thanks to its many functions and dynamism. this model has a display that can be divided into 4 areas. in area 1 displays the current altitude in permanent form, in the area 2 of the display shows the current speed on a permanent basis, a text with the description of the selected function appears in area 3 and area 4 of the display shows the value of the selected function.
Sigma Sport
Key Specs
Current speed, Maximum speed, Average speed, Trip distance, Total distance, Clock, Trip time, Total ride time
Current altitude, Current speed, Trip distance, Elapsed time, Total distance, Average speed, Maximum speed, Temperature, Clock, Slope, Trip time
Speed Measuring Range
0.0 ~ 124.0 mph
What customers say about "Key Specs"
Sigma Sport BC8.12 8 Function Bicycle Computer
  • Nice simple and sunlight readable speed distance bicycle calculator that's very light weight.
  • The controls are easy to use, have all the things I care about - ride time, trip distance, total distance, etc.
  • It does not have cadence but what it does have is simplicity. Just one button steps you through its 8 Functions.
  • If all you are looking for is a speedometer and a trip/total odometer, this is an easy to install, well-made choice.
  • Overall a very good product for the price, it gives you all the basic information you would want and is reliable.
VDO M4 Cycling Computer 2016
  • Good bit of kit. Provides lots of necessary info and has large characters display for visual feedback with a really useful altitude sensor.
  • I had a difficult time finding a replacement for my VDO 1.0. I wanted a computer that would give me altitude information including slope. I do not need to know my heart rate or pedaling cadence.
  • The M4 does what I want. It is also very easy to check through different windows for different information and easy to reset altitude at the start of the day.
  • The altitude functions are slightly confusing to set up and the manual isn't much help. The ability to switch it between two bikes and keep track of each is useful so you can swap it between your road bike and mountain bike if you've two mounting kits.
Size & Weight
4.5 in.
1.9 in.
1.6 oz.
1.06 oz.
2.8 in.
1.3 in.
1.5 in.
0.5 in.
Monochrome LCD
Monochrome LCD
Tool free install, Full text display, UFSB-compatible
Second distance counter, programmable, Computer low battery warning, Data storage during battery change (data + settings), Full text display, Suitable for two bikes (two configurable bike sizes), Display backlight
Tire sizes
16", 20", 24", 26", 28", 29"
16", 20", 24", 26", 28", 29"
Auto Start/Stop
GPS Enabled
Water Resistant
Accessories Included
Speed sensor, Zip ties, O-ring
Speed sensor
What customers say about "Features"
Sigma Sport BC8.12 8 Function Bicycle Computer
  • I found it easy to install, and when I tried it out I was very pleased with the results.
  • Its very small size makes it nicely unobtrusive on the bars. It is plainly visible in daylight.
  • Display is clear in most lighting. Takes up very little space on the handlebars, fits the provided mount securely, and detaches with a 1/4 turn.
  • This computer has been through driving rain storms, blazing heat, a few falls, and most recently a full load of laundry, but it still works through all of this!
  • My husband loves the unit, it has nice sized readout and is very simple to operate. It's german made so it should last a long time.
VDO M4 Cycling Computer 2016
  • It is also not straight forward to use and could be better programmed, more intuitive and less fiddly.
  • This may be due partly to the different settings on the size of the wheels but I followed instructions and checked several times.
  • In general this is a pretty useful computer with a nice clear display and easy to operate buttons, even with gloves on.
  • The instructions are tough, but internet search has a few videos that were very helpful. Easy to install and great to use.
  • The display never switches off. It will go in to a standby mode with the clock on but never off.
Battery Type
Lithium battery CR2032
Lithium battery CR2032
Battery Life
Up to 3 years
Up to 1 year
What customers say about "Battery"
Sigma Sport BC8.12 8 Function Bicycle Computer
  • Battery life is also a good 3 yrs+. GREAT UNIT.
  • This thing does everything I need for it to do and more, and you need to only change batteries about once every two years.
  • It's not back-lit, so I wouldn't worry about the battery life (I'd guess that it lasts about as long as a wristwatch battery would).
  • Perfect for my needs and only uses one battery (had a wireless one that required 3 batteries - waste).
VDO M4 Cycling Computer 2016
  • So far 4 months on the battery and still going strong.
  • The battery in my wired version is now 18 months old and it's got thousands of miles on it.
  • The battery doesn't last long. I'm getting at most 3 months use
Warranty / Certifications
Manufacturer warranty
2 year(s)
Other Information

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