Originally Posted by njkayaker

The SRAM mount open wide enough to get around the bar. It doesn't come with spacers. There are two versions of the SRAM mount. The road version is longer than the mountain one (it's not wildly longer but it's noticeable).

The speed sensor is more accurate for fast changes in speed. It also will register "speed" when you are on a trainer. Many people do without it (people with the 200, which can't use the sensor).

The Duotrap is an ANT+ sensor. It's understood that people will use Garmin devices with it.