It's not just hot air. Some cars are even sold with tires that already have those green caps on the tire stem because they automatically come with nitrogen, according to Consumer Reports. That ...

Thankfully, air valve caps are both inexpensive and easy to replace. 3 It's worth investing in some anti-theft caps due to a rise in dust cap thefts Credit: Getty ...

Wouldn't it be handy to have a set of valve caps that change color with pressure? This concept has been around for some time, but now a company called RightPSI says it has a new and better design ...

Anti-theft dust caps: How to protect your car from Tyre Deflator activists Whether guarding against eco-warriors or mischievous children, the devices are excellent for keeping the air in your tyres ...