If you want to use a 44T front chain ring with a 5 speed cassette, normally 14-28, you will have a slow bike.

I started with a 48/38/28 front and 11-30 8 speed cassette and that combination was to slow. I changed it to a 52/34 and which is acceptable, but some time I wish I had 54 or more. With my combination I rarely use the 2 lowest gears when climbing, but always the highest gear on the flat.

When I climb, living in the hills, I lose traction, on asphalt, when the incline is around 14deg or more, common around here.

Ok let's do some calculations. Your old top gear was 48:11 and your bottom gear was 28:30. With 20" wheels, you move 1.49 to 6.96 meter per full crank rotation.

If you're in top gear at a cadence of say 60 rpm, that's 25 km/h, at 80 rpm that's 33 km/h.

I see what you mean.

I'm going with a single 44T at the front and a single 16T at the back, and a Shimano 8 speed internal gear hub. According to

HP Velotechnik this gives a range of 2.19 m to 6.64 m per full crank rotation.

In top gear, a cadence of 60 rpm gives 24 km/h, 80 rpm gives 32 km/h, 100 rpm gives 40 km/h.

But I'd rather cruise in the more efficient 5th gear (1:1, 4.39 m). Then 60 rpm gives 16 km/h, 80 rpm gives 21 km/h, 100 rpm gives 26 km/h.

I have pretty torquey legs (once sheared a pedal off the crank) so I probably won't ever use the lower gears, especially since I don't plan on doing much hill climbing at all (Netherlands is flat).

So yeah that's indeed a little slow and I could easily go with a bigger front chain ring. And I just ordered a 44T crank set