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Bicycle Mechanics and Repair Decal Mechanical Engineering 98/198 Spring 14 Lecture 2

Bicycle Mechanics and Repair Decal Mechanical Engineering 98/198 Spring 14 Lecture 2. Logistics. Attendance sheet Hours starting next week Sign in at the shop You need 6 hours. Bike Frames. Steel Aluminum Carbon fiber Titanium Bamboo Cardboard. Different Fits for Different Bikes.

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Bicycle Mechanics and Repair Decal Mechanical Engineering 98/198 Spring 14 Lecture 2

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  1. Bicycle Mechanics and Repair DecalMechanical Engineering 98/198Spring 14Lecture 2

  2. Logistics • Attendance sheet • Hours starting next week • Sign in at the shop • You need 6 hours

  3. Bike Frames • Steel • Aluminum • Carbon fiber • Titanium • Bamboo • Cardboard

  4. Different Fits for Different Bikes • Mountain Bikes • Upright position • Road Bikes • Aggressive position

  5. MetricRoad Bikes and Some Hybrids

  6. EnglishMountain Bikes and Some Hybrids

  7. What to Adjust • The stem can be switched out for a different length or angle. • The saddle can be raised or lowered; angle adjusted. • Handlebars can be switched for a different width or shape.

  8. Cleaning and Lubricating your Chain • Don’t use WD40! • Why chain maintenance? • Longer life span • Increased pedaling efficiency • Protect your sprockets • Your average 57 link chain has 456 parts!

  9. Chain Lubes Wet lube or dry lube?

  10. Polylube (grease) • Threads • Bottom brackets • Headsets • Hub bearings • Seatposts • NOT Cable housing

  11. Lubricants

  12. Valve Types • Schrader “Automobile” or “American valve Spring-loaded valve core Flexible Generally one standard length • Presta “Valve designed for bikes” “French” valve Nut-held valve core Thinner Generally varying in length

  13. The Issue of Pumping Pumps can be specialized for only presta or schrader valves D: Some pumps also work with both :D Solution: Valve Adapters Schrader Presta Closed Presta Opened Adapter

  14. PUMP! PUMP! PUMP!

  15. Some Guidelines Check the tire pressure on the tire sidewall

  16. Pressure Recommendations (within pressure range) Check your pressure at least once a week HIGH pressure – Less rolling resistance LOW pressure – More comfort and traction on rough surfaces

  17. Quick Release Closed Start of resistance Lever Open Spring Spring Nut

  18. Removing a Wheel • To remove wheel, release the brakes • If no brake release exists, deflate the tire or manually remove the brake cable • Open quick release and unscrew nut on opposite side to remove wheel

  19. Installing a Wheel • Watch for direction of rotation • Wheel must be straight in the fork. • Quick release goes on the left side

  20. Fixing a Flat • Three ways to fix a flat • Changing the inner tube ($5-7 at bike store) • Patching the inner tube ($2-3 for patch kit) • Using a sealant (tubeless, tubular, tubed)

  21. Fixing a Flat – Step by Step • Removing the offending wheel - Quick-release vs nut and bolt? • Removing the tire - Use tire levers - No screwdrivers, knives, etc. - Typically need 2 levers for road bikes

  22. Fixing a Flat – Step by Step • Finding the hole - Pump up inner tube - Listen for the hole, or submerge in water • Patching the tube - Rough the surface - Apply rubber cement and wait 2-3 min - Apply patch and pressure for 5-10 min

  23. Repair on the Road • Sliced tire? Use a dollar bill or an energy bar wrap to add strength (doesn’t stretch) • No tire levers? Use the quick release as the tire lever. • Flat tire? No way to patch? Stuff your tire full of leaves! Lots of leaves.

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