1. silica
   Gore-Tex
2. safflower oil

If you plan to ride in the rain, spending a little extra for a silica-enhanced tire is likely worthwhile.

1. dual-sport
   racing slick
2. touring

The harder rubber of a touring tire is designed to roll straight with little resistance, giving you the best gas mileage.

1. racing slick
   sport touring
2. touring

Once warm, a racing tire's soft rubber sticks tight to turns, keeping the bike and its rider from skidding.

1. width, aspect ratio, rim size
   width, pressure, rim size
2. width, gas mileage, pressure

These are your tire's basic dimensions -- width, aspect ratio and rim size. When replacing tires, it's a good idea to match these numbers.

1. sub-inch clearance
   reverse threading
2. a rubber gasket

Be sure to look for a rubber gasket. It's surprising how many replacement caps fail to keep air in and grime out of your tire.

1. simulators
   star frames
2. spinners

A simulator is a hubcap designed to give your stock wheel a custom, vintage or otherwise cool new look.

1. crossover
   sport touring
2. dual-sport

Depending on exactly how much street and how much off-road use you're planning, you can get a dual-sport tire with the right percentages for your needs: for example, 20 percent off-road, 80 percent street.

1. spongy forest
   gravel road
2. sandy beach

Choose these tires for a ride in a spongy forest. You'll need deep, hard lugs to dig deep in the goop for traction.

1. 200 degrees
   170 degrees
2. 100 degrees

Operating temperature for most slicks is around 200 degrees. A tire warmer should leave them just short of this temperature at about 170 degrees.

1. less stable, less gas mileage
   more stable, less gas mileage
2. more stable, more gas mileage

A sport touring tire is designed to flip edge-to-edge and ride a little stickier -- thus giving it less stability and lower gas mileage.