The Cateye V3 is One of the best full function cycling computers with heart rate we have found. It is also one of our favorites as Cat Eye is a more responsive and supportive company than many of their competitors and they offer a great three year warranty.

The Cateye V3 uses the latest 2.4GHz digital data transmission that virtually eliminates interference and cross-talk, while the large screen simultaneously displays speed, cadence, heart rate and time information.

The sensor unit combines the speed and cadence sensors into one small and reliable piece that easily adjusts to most bikes. The FlexTight™ bracket fits almost all stems and handlebars without tools.

Functions:

Current speed, cadence, heart rate
Average speed, cadence, heart rate
Maximum speed, cadence, heart rate
Calorie consumption
Countdown distance
Timer
Lap time, distance, average speed, number
Distance
Odometer
Total time, clock & date

Features:

Automatic 2nd bike sensor recognition
Interference/Cross-talk free 2.4GHz digital wireless technology (ID coded)
Wireless measurement of speed, cadence and heart rate
4 heart rate zones
EL backlight
Tool-free integrated cadence/speed sensor
3 lines, 4 readouts
FlexTight™
Programmable odometer
14 files, 99 lap recording
File data review
Auto or manual start/stop
Pace arrow speed & heart rate

Specifications:

Fits almost any handlebar or stem: 22-31.8mm
Fits almost any fork: 11-55mm
Batteries: CR2032 x 2 (1 each for head unit and sensor)