Here is the list of main differences between Forerunner 55 and Forerunner 255 that we want to highlight: Garmin Forerunner 55 comes with only 42-mm case size option. On the other hand, Forerunner 255 has 41-mm and 46-mm case size option. In this post, we are mostly comparing the 46-mm case size option of Forerunner 255 with the Forerunner 55. Header Cell - Column 0 Garmin Forerunner 55 Garmin Vivoactive 4; Dimensions: 42 x 42 x 11.6mm: 45.1 x 45.1 x 12.8mm 40 x 40 x 12.7mm: Display: 1.04-inch sunlight-visible, transflective The device can connect at a greater distance via Bluetooth or infrared to another device. Compatible with external heart rate monitors. Garmin Forerunner 245 ( Garmin Connect Mobile) Garmin Forerunner 45S 42mm ( Garmin Connect Mobile) It supports third-party heart rate monitors to incorporate your pulse data. Design. is dustproof and water-resistant. Garmin Forerunner 245. Garmin Forerunner 955. The device is dustproof and water-resistant. Water-resistant devices can resist the penetration of water, such as powerful water jets, but not being submerged into water. sweat resistance. Garmin Forerunner 245. Garmin Forerunner 55PlayBetter (USA): Garmin Forerunner 245 (Garmin Connect Mobile) It is compatible with smart scales such as the Fitbit Aria and Withings range. These scales transmit information such as weight and BMI to connected services over Wi-Fi. Coros Pace 2 vs Garmin Forerunner 735XT comparison on basis of features screen size price in india, reviews & ratings and much more with full phone specifications at Gadgets Now Design. is dustproof and water-resistant. Garmin Forerunner 220. Garmin Forerunner 245. The device is dustproof and water-resistant. Water-resistant devices can resist the penetration of water, such as powerful water jets, but not being submerged into water. sweat resistance. Garmin Forerunner 220. NCbFgd.