Garmin Forerunner 955 Solar GPS Smartwatch - 45.6mm Black 2 Tire Clearance:

Tire Clearance:

or XTR 9130 crankset (narrow q-factor version)

model EA50 diameter 27

Ultra) at a more affordable price than the FF1

Garmin Forerunner 955 Solar GPS Smartwatch - 45.6mm Black 2 Tire Clearance:Get up to 20 days of battery life in smartwatch mode with solar charging. In GPS mode, get up to 42 hours and up to 49 hours when solar charging. With UltraTrac mode, go even longer with up to 110 hours when solar charging2 (solar version only) Click or swipe through maps and stats with traditional button controls or a new, responsive touchscreen Clocking in at just 52 grams, the Forerunner 955 smartwatch will keep you light on your feet and attuned