Rule of thumb: As long as your bike is ≤12% of your body weight, don't worry about its weight. (that gives me an allowance of 26-30lbs, which still doesn't give me a lot of room, since really expensive road bikes are ~15lbs, and some classes of bikes (downhill) never ever get below 33lbs)

Automated Postal Center

• The system is designed to allow you to weigh packages without having to enter credit information or commit to shipping an item.
• They're always located somewhere that's accessible 24/7.
• Regardless, if someone is curious what you're up to, just tell them you're selling several bike parts on eBay, and wanted to estimate the shipping cost before posting the auction.
• Accuracy usually displays as 0.01 ounce (but sometimes only as 1.0 ounces?).
  However, the last digit seems to always be 0, making it more like 0.1 ounce, or ~2.5 grams, or ~0.005 pounds..
• Max weight: 70 pounds
• Be aware that every customer's picture is taken (though the camera porthole is easily spotted and possibly covered). Regardless, think twice before hoisting an entire bicycle up there.
• Weighing things that are too large to lay flat (e.g. wheels, unicycles, or entire bikes) is done by balancing them on the scale. As long as the object is as close to its balance point as possible, and as long as the stabilizing forces from your hand are as close to horizontal as possible, you'll affect the vertical vector component a negligable amount. (for a full bike, rubber-band its rear brake handle so it can be easily balanced on the rear wheel)

Trends

• favorable for weight
  • cyclocross — fast and can handle lots of mud (basically a road bike with slightly thicker frame, and slightly wider wheels)
• unfavorable for weight
  • 29" wheels (they have 11.5% more circumference, and thus that much more rotational mass)

Websites

• weightweenies.starbike.com/listings.php
• light-bikes.com/BikeGallery/
• bolt tuning
• epicdesigns-ak.blogspot.com — AKA "weight? weight?!!?!? fuck weight!"