It’s well worth fitting a cycling computer to whatever cycle you ride for reasons that are not obvious to a begginer. Apart from speed and distance the most useful function that a cycle computer needs is an average speed reading.
I’ll explain, my current average speed is 13 mph, if I plan to do a 40 mile ride this will take me approximately 3 hours. Maximum speed on todays run was 40 mph down a steep hill, minimum was probably about 7mph. As you clock up the miles the figure becomes a reflection of what terrain you are riding,your effort and which way the wind blows. The figure can be used to give others a guide to when your going to arrive at a destination or if there is a change of plan you know how long it will take you to get home.
Tesco,s do a cycle computer with average speed for £7 so it needn’t break the bank.