#2 - RUBBING BRAKES CREATE UNWANTED FRICTION. http://bicyclethaila...ycle-brakes.jpg
#3 - SMOOTH SHIFTING = FAST SHIFTING. The rider has three points of contact with the bicycle: the saddle, the pedals, and the handlebar. This last point of contact is often referred to as the dashboard of the bicycle; it is here that the rider spends most of his or her time manipulating the gear and brake controls that directly influence how the rider's leg power (applied at the pedals) is utilized by the bicycle. Smooth and crisp gear shifting correlates to less power loss.
Guidelines for replacement of brake and gear cables - http://bicyclethaila...ce-your-cables/
http://bicyclethailand.com/wp-content/uploads/2012/08/bicycle-tire-pressure.jpg
Pressure guidelines for Mountain Bikes - http://bicyclethaila...-tire-pressure/
#5 - WHEEL BEARINGS. Regardless whether your bicycle has sealed, cage, or loose ball bearing hubs a full servicing or replacement will have you coasting down the pavement or floating through the trail with a new found ease. Have your bearings serviced or replaced at your local bike shop.

TIP 2 - Ask your local bike shop to give you the old bearings/parts when you have your wheels serviced. Not only will you be able to see the wear and tear present on your old set of wheel bearings but you will also have a great resource in hand when searching for replacement bearings/parts for your wheels in the future.