I have a VDO head unit that I swap between my two bikes...one bike has the cadence transmitter, the other doesn't. I found that my cadence transmitter only confirmed that my average cadence is right within the recommended range (85 - 95) on every ride and that it's rare if my average falls outside the 89 - 91 range. Knowing that is what made me decide not to acquire the transmitter for my second bike.