Core Skills Analysis
Science (Physics)
The student examined the SRAM GX Eagle AXS drivetrain and identified how the gear system changes the bike's speed and effort. They described the principles of mechanical advantage, explaining how larger sprockets reduce pedaling force while increasing distance traveled. The student also discussed the role of friction and chain tension in efficient power transfer. Their observations linked real‑world motion to concepts of force, work, and energy.
Mathematics (Ratios & Proportions)
The student calculated gear ratios by dividing the number of teeth on the rear cassette by the number of teeth on the front chainring for several gear combinations. They compared these ratios to determine which gear provided the easiest pedaling cadence versus the highest speed. By creating tables of ratios, the student practiced organizing data and interpreting patterns. Their work demonstrated the use of ratios, fractions, and proportional reasoning in everyday technology.
Technology & Engineering
The student explored the electronic shifting features of the SRAM GX Eagle AXS, noting how wireless signals control gear changes. They identified key components such as the shifter, derailleurs, and battery, and explained how they integrate to create a reliable system. The student also considered design constraints like weight, durability, and battery life. Their analysis highlighted systems thinking and the engineering design process.
Physical Education (Health & Fitness)
The student rode a bike equipped with the SRAM GX Eagle AXS drivetrain and observed how different gears affected effort and speed on varied terrain. They reflected on how proper gear selection can improve endurance and reduce fatigue during long rides. The student recorded how heart rate and perceived exertion changed with each gear choice. Their experience connected biomechanics and cardiovascular health to equipment choice.
Tips
To deepen learning, have the student build a simple gear‑ratio calculator using a spreadsheet and test predictions on the bike. Next, organize a mini‑workshop where they disassemble and reassemble a derailleur to reinforce mechanical skills. Encourage them to design a poster that compares electronic versus mechanical shifting systems, integrating research and visual communication. Finally, plan a local bike‑ride scavenger hunt that requires choosing optimal gears for specific hill grades, linking math, science, and fitness.
Book Recommendations
- The Bicycle Book: Everything You Need to Know About the Bike by Megan J. Wallace: A kid‑friendly guide to how bicycles work, covering gears, brakes, and the physics of motion.
- Gear Up! A Guide to Bike Mechanics by John R. Miller: An illustrated handbook that explains gear ratios, drivetrain components, and basic maintenance.
- The Way Things Work: Physics for Kids by David Macaulay: A classic visual tour of everyday machines, including chain drives and gear systems.
Learning Standards
- CCSS.MATH.CONTENT.7.RP.A.2 – Recognize and compute ratios and rates related to gear ratios.
- CCSS.ELA-LITERACY.RI.7.1 – Cite textual evidence when describing the function of drivetrain components.
- NGSS MS-PS2-2 – Apply Newton’s second law to analyze the forces involved in pedaling and gear changes.
- NGSS MS-ETS1-2 – Evaluate design solutions for a mechanical system, such as the AXS drivetrain, against constraints like weight and durability.
Try This Next
- Create a worksheet where students calculate and compare gear ratios for at least five different cassette‑chainring combinations.
- Design a quiz with multiple‑choice questions on the function of each AXS component (shifter, battery, derailleur).
- Ask students to draw a labeled diagram of the AXS system and annotate where wireless signals travel.
- Develop a short writing prompt: "Explain how choosing the right gear can help a cyclist stay healthy during a mountain ride."