Threaded headsets have one continuous metal piece (stem) that comes up out of the frame, bends forward, and then attaches to the handlebars. There is a nut where the stem leaves the frame that holds it in place and one bolt at the top of the stem. These stems are easy to adjust and are common on single-speed, fixed gear, and older bikes. Some bikes do not have a hex nut by the frame, and just have the bolt on the top of the stem. This bolt, pointing straight down, creates the pressure that holds the stem in place. Use an Allen key to loosen in, though your don't need to remove it entirely. Disengage the hex nut, which is the "ring" where the stem meets the bike frame, by loosening it with a wrench. You may need to wiggle, twist, and pull to get them out. If this is a new bike, mark the location where the handlebars used to rest with a marker or measurement so that you can return to this location if you need. Clean off any gunk on the stem with soapy water and then dry it with an old rag. To prevent the stem from getting stuck in the frame later on, apply a little anti-seize grease around the bottom 2-3 inches of the stem. Proper handlebar positioning largely depends on the type of bicycle you're using. That said, the number one concern when picking a height is rider comfort. You should put the handlebars where you can comfortably ride every time. Road bike: Handlebars on racing bikes should be slightly lower than the seat to provide optimum aerodynamics and control at high speeds. Mountain bike: Mountain bike handlebars should be lower than the seat. This gives you a lower center of gravity and better balance when negotiating rugged terrain. Cruiser: Handlebars on standard bikes should be slightly higher than the seat to limit strain and provide maximum comfort. Hand tightness should be fine, especially with the top bolt. You don't want to crank on the bolt, making it so tight that you can't remove it later.

Summary: Know if you have a threaded headset. Loosen the bolt on the top of the stem. Loosen the locknut with a wrench. Pull the handlebars out of the frame. Wipe down and grease the stem lightly. Consider the kind of riding you'll be doing when deciding a new handlebar type. Place the stem back at your desired height and tighten the hex nut and top bolt.

An engine block heater is a small heating device installed in the engine that plugs into a wall socket. It warms the engine and oil and eases start-up. Engine block heaters are not expensive, but they must be installed properly by a mechanic. Your car's battery can deliver much more power when it's warm. You can do this using a battery wrap. A battery wrap or blanket is usually a fixed installation of insulation and heating element around the battery. They require about an hour to sufficiently warm the battery. Parking indoors, in a garage, helps to shelter a car's engine from icy winds and freezing temperatures. Heat the garage, if possible, to keep the temperature warmer. In the extreme cold, oil thickens and doesn't flow quickly to vital engine parts that need lubrication. A lightweight, winter-grade oil flows easier in cold weather and increases fuel economy. Your owner's manual should tell you the ideal type of oil you should use. Gas line antifreeze, also known as dry gas, is a chemical (essentially Methyl Hydrate) that is added to your gas tank to inhibit your gas line freezing. If your gas line freezes, your car will not be able to start until it thaws. Many gas stations already add an anti-freeze agent into their gas during colder weather months. Check with your station of choice and see if this is their practice. Add dry gas to your petrol or gas fill-up before filling the tank (if possible) to ensure it mixes completely in the tank. A fuel conditioner is a multi-functional diesel fuel additive. A diesel engine will start better in the cold if you use fuel conditioner, which prevents the fuel from "gelling" and ensures reliable fuel performance in severe winter conditions. Condensation on the walls of a gas tank will form and will eventually sink to the bottom and cause freezing problems in your fuel lines. It's much more difficult to start a cold car with a mostly-empty tank, so do yourself a favor and gas up often in the winter before letting the car sit.
Summary: Warm the engine with a block heater. Keeping your car's battery warm. Park indoors. Use thinner oil. Use gas line antifreeze with fuel stabilizer. For diesel engines, consider using fuel conditioner. Keep your fuel tank full.