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Yes. Road disc wheels and tyres will work with your gravel bike. As long as the wheels have the same axles (100x12mm & 142x12) they will work fine, many gravel bike riders have a road wheelset with fast road tyres for days on tarmac.

No. Tubeless tyres take a bit of effort for setting up, they also need regular top ups of sealant. How often and how much sealant for the top-ups depends on the tyre volume and the temperature where you live.

While they do take a bit of effort to get set up, tubeless tyres offer a few very real advantages. Firstly, the sealant can plug  punctures without you even knowing about them - there are limits though, bigger holes will need a tubeless plug. Generally, having no inner tube reduces the weight of wheels, making for a more 'sprightly' ride and improving performance. Tubeless tyres can be run at much lower pressures (if you need more grip off-road for example) without risking pinch flat punctures.

However, tubeless isn't ideal for everyone. If you just want to hop on and ride, and maybe don't have patience for the inevitable initial 'letdowns' of tubeless, it might be better to stick to tubes.

Probably yes. While some lower air capacity tubeless tyres (road tyres for example) can be set up with a regular floor pump, tyres with a bigger air capacity volume (such as gravel and MTB tyres) will usually need a bigger blast of air to properly seat the tyre onto the rim.

Stick to recommended tyre pressures and avoid speeding up the wearing process by skidding and regularly loosing grip (although it can be fun...). Nice smooth roads tend to wear road tyres less

Yes, either use with an inner tube, or there are tubeless conversion kits available, they work better on some rims than others. The best option with tubeless tyres is to use tubeless ready rims.

Because tyres have flexible side walls, it is possible to use wider tyres on narrower rims. However using 2.8” tyres on a narrow rim, for example, would result in a lightbulb shaped tyre which would negatively affect cornering and the feel of the tyre. It is best broadly speaking, to stick to manufacturers recommended guidelines to get the best performance. If you are planning on using wider tyres, also make sure they will fit your frameset before purchasing.

No. Sometimes harder tyres are slower because they bounce around a lot more on rougher roads, trails and tracks. On perfectly smooth roads or in the velodrome, harder tyres are usually faster - however always inflate to manufacturers recommended pressures.

Check tyre size on the sidewall of the tyre. Most road, hybrid and gravel bikes are 700c diameter, so the tyre size would be 700 x the width of the tyre, a 25mm tyre, for example, would be 700 X 25.

Firstly, think about where you inflate your tyres. Do you need to inflate in the garage before your ride? Or out on the roads / trails, for emergency punctures? Floor pumps are best for keeping at home and offer the quickest and easiest way to inflate tyres to the right pressure. Mini pumps are best for taking on your ride, to use in the event of a puncture.

Tubeless pumps have an extra capacity tank which can release a large volume of air in one go. This helps seat tubeless tyres onto the rim.

Check which type of valve your pump needs to fit. Presta valves are thinner and have a screw closure at the end of the valve. Schrader valves are like car valves, fatter with a metal pin closure system. There are lots of pumps that can do both valves, if you need both types for different bikes.