The GPS bike computer for those who want to get going right away. Large display, ease of use and 17 functions: The VDO R-Series GPS bike computer displays all the basic data that beginners and cycling enthusiasts need to keep track of. In addition to speed, distance traveled and training time, this smart bike computer lets you navigate trails and can be linked to compatible e-bikes. The high-contrast 2-inch display and extra-large digits are easy to read, even when riding. A highlighted blue square in the top right-hand corner of the screen presents training data in a new way. With the compatible SIGMA RIDE app for your phone, six different views of training data can be configured in just a few clicks. The VDO R4 GPS comes with a clamp to position the GPS computer in the center of the handlebars, just above the stem. The clamp fits handlebars from 31.8 to 35.0 mm in diameter. No wiring or transmitters are required.