Change a flat

| April 28, 2011 | 0 Comments

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Change your flat in a flash with this step-by-step guide from Trek

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Step 11. Keeping the bike right side up, shift the bike into the smallest cog.
Step 22. Open up the brake to allow the tire to pass through freely.
Step 33. Standing on the non-chain side of the bike, flip the quick- release lever to the “open” position.
Step 44. With your left hand, grasp the top tube of the bike and lift the rear wheel off the ground. Since the quick release is open, the wheel will fall out of the dropout.
Step 55. While still holding the frame with your left hand, reach your right hand down to the small tab found on the derailleur above the small wheel. This will cause the chain to slack.
Step 66. Move the frame away from your body so the chain falls off the rear wheel. Grab the wheel with your right hand and set the bike down on the non-chain side.
Step 77. Aligned with a spoke, insert the scoop end of your first tire lever under the bead of the tire. Attach the hook of the tire lever to the aligned spoke.
Step 88. Approximately 3 inches from the first tire lever, insert the scoop of the second tire lever and pry one side of the tire off the rim.
Tire leversIf the tire is old, you can probably get it off with your thumbs. If it’s a new tire, you’ll probably need tire levers to pry it off.
Step 109. Remove the tube, and inflate it to see what type of puncture you have. Remove any debris lodged in the tire, so when you put a new tube in, it won’t flat right away.
Step 1110. Take your new tube and blow a small amount of air in it to give it shape.
Step 1211. Insert valve stem into the hole in the rim and feed the tube back into the tire.
Step 1312. Make sure one side of the tire is mounted all the way aroud the rim. For the second side, start at the valve hole and push the tire on with both hands, traveling in opposite directions around the rim.
Step 1313. Inflate the tube to give the tire shape. Inspect to make sure tube isn’t sticking out. Inflate to pressure recommended on the side of the tire.
Step 1414. Put the wheel back through the dropouts with the quick-release lever on the side opposite the chain.
Step 1515. Line up the chain and lay it on the smallest cog of the cassette. Click the dropout into the quick release part of the wheel.
Step 1616. Hold the quick-release lever in the open position while tightening the nut on the right side of the bike. Closing the lever should be hard enough to leave an impression on your hand.
Step 1717. Finally, close the brake quick-release to engage the brake pads closer to the rim.
Tire PSI: Mountain & Road TiresStep 19The psi rating range on the side label of mountain bike tires is just that—a range.
Most riders over-inflate their tires for off-road mountain bikes out of fear of getting a pinch flat. For most riders a psi setting of 35-40 is fine. However, going too low in psi can lead to side wall cuts much like a tube pinch. So play with psi pressures to find the optimum level that will give you the best traction, control, and protection for the trail you ride on most.
Road bike tires can also be over-inflated. Tires are a form of suspension, and while over-inflated tires may benefit you with fewer pinch flats, they will slightly reduce your traction, and therefore speed. For example, instead of 120psi, try 100-110. You will gain traction and allow the tire to roll over small imperfections, giving you a smoother ride that is just as fast, if not faster, over the long haul.

Category: Cycling

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