AY Honors/Cycling - Advanced/Answer Key 2/en

Cycling - Advanced

Skill Level

2

Year

1976

Version

24.11.2024

Approval authority

North American Division

1

Have the Cycling honor.

For tips and instruction see Cycling.

2

Describe how to select the correct frame size, handlebar, and saddle height to fit one's body size.

3

Describe briefly all the desirable features of a bicycle used for long distance touring.

4

Take apart, clean, and reassemble the bearings in the front and rear wheels, head-set, and bottom brackets.

5

Explain and demonstrate the meaning of "BCD" as it relates to the crank.

Bolt Center Diameter. This is the spacing between the bolts on the crank shaft. This is important when ordering new parts so as to get the correct replacement. It is the space between the bolt holes in the crank that hold the chain rings on.

6

Select the crank and rear sprocket combination that would give the best results under the following conditions:

6a

Riding in hilly terrain

Shimano/Sram combinations: a. Crank: (sub-compact) 50/34 Rear: (amateur) 11-28 b. Crank: (mid-compact) 52/36 Rear: 12-27 c. Crank: (full-size) 53/39 Rear: 12-25 Note: The most common combinations are given for the rear cassette. There are other combinations that might be more applicable to your bike, experience, weight, and other factors.

6b

Touring with packs on the bicycle

6c

Riding in level country

7

Explain how the riding characteristics of a bicycle are affected by:

7a

The geometry of the bicycle frame including:

i

Head and seat tube angles

Aerodynamic features. All can be changed so that the rider can ride with less wind resistance.

ii

Fork rake

Technically, fork rake is the angle of the head-tube with reference to a line perpendicular to the ground. The closer to perpendicular, that is, the more steep the head-tube, the less "rake" the fork will have, where an angle further from perpendicular or shallow the head-tube angle (laid back geometry), the more rake. Motorcycles with high rake are often called "choppers."

The purpose of a steeper angle gives quicker, lighter, but less stable steering, a desirable feature in road racing and some mountain bikes. Shallower rake gives more stable, but slower handling, steering, better for general recreational bicycles and touring bikes.

Some people mistakenly believe that fork rake is the distance the front wheel is offset from an imaginary line extending through and parallel to the headtube. Technically, this is better termed "offset." Road racing and touring forks usually have a curve in the fork blade itself, while suspension forks have a curved fork crown (holds the fork legs and shocks to the steerer tube).

The purpose for fork offset is to absorb shock, and to prevent forks from cracking at the crown from the vertical pounding of road/trail vibration.

iii

Chain stay length

iv

Bottom bracket height

v

Wheel base length

7b

The kind of wheels used including:

i

Clincher or tubular tires

The clincher has a tube inside it, and thus is a heavier tire. It however can be fixed on the trail. A tubular tire is a tire glued onto a rim, and thus cannot be repaired. However, tubular tires are much faster (lower rolling resistance). Tubular tires aren't used by most riders. Tubeless tires are clincher tires that have a sealant glue inside instead of a tube. With tubeless tires, they are often self-repairing for minor punctures. They are lighter (less rolling resistance) than clincher tires.

ii

Number of spokes used on each wheel

20 (F), 24 (R) are normal for light/medium riders. If someone is a Clydesdale rider (heavier) there will be significantly more spokes. Riders over 200 lbs (Clydesdale) have more spokes to support the rider (24 front, 28 rear)

iii

Number of spokes each spoke crosses

The number each spoke crosses varies based on the number of spokes. Thus, this is less aerodynamic the more crosses take place because this means a heavier rider is riding on a heavier wheel.

8

Make a list of desirable equipment items to be taken on a multi-day bicycle tour, including shelter and cooking equipment.

There are two types of multi-day tours. Supported, and Self-supported.

For all tours, the rider needs -- a larger repair kit, sleeping stuff-sack, chosen food, sterno/single burner stove, cooking kit, bug repellent, sunblock, basic first aid kit, clothing (socks, cycling clothing kit), ride nutrition, shelter.

If this is a supported multi-day tour, the support team can bring those to the camping site. If not, compact supplies that can be carried on the bike are a necessity.

9

Review courtesy and safety rules used while bicycling. What are the rules for the road for cyclists in your local area?

The following is from the National Highway Traffic Safety Administration (and therefore free to reprint and reuse)

Bicycle riding is fun, healthy, and a great way to be independent. But it is important to remember that a bicycle is not a toy; it’s a vehicle! Be cool – follow some basic safety tips when you ride.

Safe Riding Tips Before using your bicycle, make sure it is ready to ride. You should always inspect your bike to make sure all parts are secure and working properly. Remember to:

Wear a Properly Fitted Bicycle Helmet. Protect your brain, save your life. For more information see the National Highway Traffic Safety Administration publication “Easy Steps to Properly Fit a Bicycle Helmet.”

Adjust Your Bicycle to Fit. Stand over your bicycle. There should be 1 to 2 inches between you and the top tube (bar) if using a road bike and 3 to 4 inches if a mountain bicycle. The seat should be level front to back. The seat height should be adjusted to allow a slight bend at the knee when the leg is fully extended. The handlebar height should be at the same level with the seat.

Check Your Equipment. Before riding, inflate tires properly and check that your brakes work.

See and Be Seen. Whether daytime, dawn, dusk, foul weather, or at night, you need to be seen by others. Wearing white has not been shown to make you more visible. Rather, always wear neon, fluorescent, or other bright colors when riding day or night. Also wear something that reflects light, such as reflective tape or markings, or flashing lights. Remember, just because you can see a driver doesn’t mean the driver can see you.

Control Your Bicycle. Always ride with at least one hand on the handlebars. Carry books and other items in a bicycle carrier or backpack.

Watch for and Avoid Road Hazards. Be on the lookout for hazards such as potholes, broken glass, gravel, puddles, leaves, and dogs. All these hazards can cause a crash. If you are riding with friends and you are in the lead, yell out and point to the hazard to alert the riders behind you.

Avoid Riding at Night. It is far more dangerous to ride at night than during the day because you are harder for others to see. If you have to ride at night, wear something that makes you more easily seen by others. Make sure you have reflectors on the front and rear of your bicycle (white lights on the front and red rear reflectors are required by law in many States), in addition to reflectors on your tires, so others can see you. Many bicycle-related crashes resulting in injury or death are associated with the bicyclist’s behavior, including such things as not wearing a bicycle helmet, riding into a street without stopping, turning left or swerving into traffic that is coming from behind, running a stop sign, and riding the wrong way in traffic. To maximize your safety, always wear a helmet AND follow the rules of the road.

Rules of the Road – Bicycling on the Road

Bicycles in many States are considered vehicles, and cyclists have the same rights and the same responsibilities to follow the rules of the road as motorists. When riding, always:

Go With the Traffic Flow. Ride on the right in the same direction as other vehicles. Go with the flow – not against it.

Obey All Traffic Laws. A bicycle is a vehicle and you’re a driver. When you ride in the street, obey all traffic signs, signals, and lane markings.

Yield to Traffic When Appropriate. Almost always, drivers on a smaller road must yield (wait) for traffic on a major or larger road. If there is no stop sign or traffic signal and you are coming from a smaller roadway (out of a driveway, from a sidewalk, a bike path, etc.), you must slow down and look to see if the way is clear before proceeding. This also means yielding to pedestrians who have already entered a crosswalk.

Be Predictable. Ride in a straight line, not in and out of cars. Signal your moves to others.

Stay Alert at All Times. Use your eyes AND ears. Watch out for potholes, cracks, wet leaves, storm grates, railroad tracks, or anything that could make you lose control of your bike. You need your ears to hear traffic and avoid dangerous situations; don’t wear a headset when you ride.

Look Before Turning. When turning left or right, always look behind you for a break in traffic, then signal before making the turn. Watch for left- or right-turning traffic.

Watch for Parked Cars. Ride far enough out from the curb to avoid the unexpected from parked cars (like doors opening, or cars pulling out).

Sidewalk versus Street Riding

The safest place for bicycle riding is on the street, where bicycles are expected to follow the same rules of the road as motorists and ride in the same direction.

• Children less than 10 years old, however, are not mature enough to make the decisions necessary to safely ride in the street.

• Children less than 10 years old are better off riding on the sidewalk.

For anyone riding on a sidewalk:

• Check the law in your State or jurisdiction to make sure sidewalk riding is allowed.

• Watch for vehicles coming out of or turning into driveways.

• Stop at corners of sidewalks and streets to look for cars and to make sure the drivers see you before crossing.

• Enter a street at a corner and not between parked cars. Alert pedestrians that you are near by saying, “Excuse me,” or, “Passing on your left,” or use a bell or horn.

For more information on bicycle safety, visit the National Highway Traffic Safety Administration (NHTSA) Web site at: www.nhtsa.dot.gov

10

What are the advantages of drafting? Know how to safely and properly draft.

Drafting (or slipstreaming) is a technique where two vehicles or objects align in a close group to reduce the overall effect of drag by using the lead object's slipstream. When high speeds are involved, drafting can significantly reduce the group's average energy expenditure needed to keep a certain speed and can slightly reduce the energy used by the lead vehicle or object.

Drafting is used to reduce wind resistance and is seen most commonly in bicycle racing, car racing, and speed skating, though drafting is occasionally used even in cross-country skiing and running. Some forms of triathlon allow drafting. Drafting occurs in swimming as well, both in open-water races (occurring in natural bodies of water) and in traditional races in competition pools. In a competition pool, a swimmer may hug the lane line that separates him/her from a swimmer of whom s/he is abaft, thereby taking advantage of the liquid slipstream in the other swimmer's wake.

In cycling, the main (largest) group of tightly packed cyclists in a race is called a peloton, while cyclists riding in straight-line formation, each (but the first) drafting behind the one in front of him, is called a pace line.

Drafting can be cooperative, in which several competitors take turns in the lead position (which requires the most effort and energy consumption). Or, it can be competitive or tactical, where one competitor will try to stay closely behind another leaving him or her more energy for a break-away push to the finish line.

• 

  Cyclists drafting

• 

  Canadian Geese drafting in V formation

• 

  Stock cars drafting

11

Know the different clothing articles used in bicycling and the advantages of each.

Different types of cycling have different clothing and protective gear. However, some are common to all cycling:

1. Helmet - protects head in the event of an accident, can provide sun shade and protection. Are required in some places, or for some ages.
2. Gloves - protects hands, usually the first body part to hit the ground in the event of an accident; padding in gloves eases fatigue and can provide some shock-absorption. Gloves protect road-riders' hands when cleaning glass, gravel, etc., from tires while riding.
3. Glasses - keeps bugs and debris out of the eyes, and keeps eyes from watering in cold weather or high-speed rides. Sunglasses reduce glare and keep eyes from becoming over-tired.

General safety equipment which is not required, but used by some cyclists includes:

1. Mirrors - these attach to the handlebars or rider's helmet for seeing cars/cyclists behind. These can be important for commuters, bicycle messengers, or those cycling in urban/suburban environments.
2. Bells - mountain bikers on hidden single-track trails, or cyclists in busy areas may use handle-bar mounted, finger-activated bells to warn of approach.

Riding at night has it's own safety requirements:

1. Front and rear lights - these are required in some locales after sunset.
2. Reflectors - mounted on wheels, pedals, frame, seatpost or handlebars are the most common.
3. Reflective clothing - many makers of cycling clothing integrate reflective tape or strips on shoes, pants/shorts, shirts/jackets or helmets.

12

List the maintenance checks needed prior to riding a 100-mile (160 km) tour, including items such as:

12a

Truing tires completed

12b

Cables are tightened

12c

New tubes and tires, pressures checked

12d

Chain lubrication

12e

Brake pad thickness checked

12f

Repair tool kit verified

13

Develop a plan that involves hydration and nutrition that you will use before, during, and after a ride.

14

Have the following riding record while working on this honor:

14a

Make three single-day 20-mile (32 km) rides in different locations.

14b

Complete either a 75-mile (120 km) one-day bicycle trip or a multi-day 100-mile (160 km) bicycle tour.

For this you should keep records. Photographs and a map are good visual aids.

15

Evaluate the 75-mile trip (120 km) or 100-mile (160 km) tour. Answer such questions as:

15a

What were high/low points of the ride?

15b

What parts of your preparation helped you succeed? What could you have better prepared for?

15c

When did you almost quit? Why?

15d

How did your hydration and nutrition plan work during your ride? What was most helpful? What would you change about your plan next time?

15e

What would you do differently next time?

References