Bike

There are kinds of bikes:

• EBike: sit straight, high gear ratio, one gear, foldable

• Folding Bike: foldale

• Gravel Bike: can carry stuff, less gears (10), more relax geometry

• Road Bike: thin wheel, can't carry stuff, many gears (22)

• Hybrid: ...

• Mountain Bike: less gears

  • Cross Country: carbon fiber
  • Trail: suspension
  • Enduro
  • Downhill: racing
  • Fat bikes

Wheel width: thin wheel faster, but very bumpy

Sitting: don't sit straight. You should support with bot your hand and spine, reducing vibration.

Price: 2nd-hand is good, since they are cheap. A bike can be stolen even it is locked. A lower-price bike also cost less to maintain.

Anatomy of Bikes

Suspension Fork: reduce vibration (travel: how much it compress)

• hardtail: front fork only, shock in the rear

• full suspension: shock in the rear

Maintaining a Bike

Two main component:

• Grease

• Chain Oil

Modern Bike:

• Grease

• Tire Sealant

• Break Oil

• Fork Oil

• Shock Oil

• Carbon Fiber Grip

Type of Trails

Trail Head: enter of exit point Fire Road: car-wide road for firefighters Flowy Trail: no rock, windy, narrow Technical Trails: rocks, drops