SO GOOD
The CM 109 sits at the cheapest end of the bike computer spectrum but still offers help when navigating. The wired spoke-magnet sensor records your current speed and total and trip distances.
You can zero the trip distance independently of the total distance to measure individual stages and ensure you don’t overrun a leg of your route and miss an important landmark or junction. The quarter-turn base held our test sample securely while riding over rough terrain.
NO GOOD
Initial set-up is confusing, but it’s otherwise hard to fault for the price.
Price 16$