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

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Presentation transcript:

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 Mountain Bikes – Upright position Road Bikes – Aggressive position

Metric Road Bikes and Some Hybrids HeightInseam LengthBike Frame Size 4'10" - 5'1"25.5” - 27” cm 5'0" - 5'3"26.5" - 28" cm 5'2" - 5'5"27.5" - 29" cm 5'4" - 5'7"28.5" - 30" cm 5'6" - 5'9"29.5" - 31" cm 5'8" - 5'11"30.5" - 32" cm 5'10" - 6'1"31.5" - 33" cm 6'0" - 6'3"32.5" - 34" cm 6'2" - 6'5"34.5" - 36" cm

English Mountain Bikes and Some Hybrids Your HeightYour Inseam Length Bike Frame Size 4'11" - 5'3"25” - 27” inches 5'3" - 5'7"27" - 29"15 to 17 inches 5'7" - 5'11"29" - 31"17 to 19 inches 5'11" - 6'2"31" - 33"19 to 21 inches 6'2" - 6'4"33" - 35"21 to 23 inches 6'4" and up35" and up23 inches and up

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.

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!

Chain Lubes Wet lube or dry lube?

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

Lubricants

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

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

PUMP! PUMP! PUMP!

Some Guidelines Check the tire pressure on the tire sidewall

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

Quick Release Lever Spring Nut Open Closed Start of resistance

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

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

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)

Fixing a Flat – Step by Step 1.Removing the offending wheel - Quick-release vs nut and bolt? 2.Removing the tire - Use tire levers - No screwdrivers, knives, etc. - Typically need 2 levers for road bikes

3.Finding the hole - Pump up inner tube - Listen for the hole, or submerge in water 4.Patching the tube - Rough the surface - Apply rubber cement and wait 2-3 min - Apply patch and pressure for 5-10 min Fixing a Flat – Step by Step

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.