Metahuman couriers would still probably be the standard. Drones are okay when they don't have to do anything complicated, but without a rigger they don't deal well with the unexpected. A person is better equipped to deal with the traffic jams, gang wars, construction and general chaos of the 2070 urban environment. The same reason they exist today. Bikes, smart skateboards, even cyberware rollerblades or parkour adepts can all make a human courier a very effective choice to quickly move time-sensitive goods and data.
As for the cost of a bicycle, in RL that can very from under a hundred bucks to several thousand with the difference in performance being small enough that the game stats would be almost identical.
Given how compact and cheap motors and power supplies are in 2070, it is also likely that almost every bike would have an electric motor in the wheel hubs to either provide assistance on hills, or allow even greater speeds, which blurs the line between bikes and motorcycles. Mostly it allows you to ignore hills and such to make the rules more streamlined.
I would treat bicycles as a type of motorcycle, maybe adjusting certain stats based on the rider.
Something like this maybe:
| Handling | Accel | Speed | Body | Armor | Sensor |
Road Bike | 5/3 | 2 | (STR+AGI)/3* | 2 | 0 | 1 |
Mountain Bike | 5/5 | 1 | (STR+AGI)/3** | 2 | 1 | 1 |
* Round up
** Round down
Appropriate cost would probably fall somewhere around 300-500¥.