Is the Invicta Speedway a good everyday watch?

Yes, if you like a large, bold watch. The quartz movement is accurate and needs no winding, and the steel bracelet holds up to daily wear. It is heavy and bulky, so it suits bigger wrists better than small ones.

What do the subdials on the multi-function dial do?

They add functions beyond standard time, typically day, date and a 24-hour indicator. They are set with the crown and pushers rather than running on their own.

Does it need winding or a battery?

It runs on a battery. There is no automatic rotor to wind, so upkeep is a battery change every couple of years or so.

How does it compare with an automatic watch at a similar level?

Quartz is more accurate and needs less care than an entry-level automatic. An automatic offers a sweeping seconds hand and mechanical appeal, but costs more to service and can drift.

Can the bracelet be resized?

Yes. The links can be removed to fit your wrist, but most owners have a jeweler or watch tool do it rather than adjusting it themselves.

Is it suitable for swimming?

Treat it as a everyday watch and keep it out of water unless the caseback states a water resistance rating. The listing does not specify one, so do not swim or shower with it.