SHIMANO Drivetrain Lab

Interactive Front & Rear Derailleur Mechanics Visualizer

Try Challenges

Shimano Tiagra / 105 Smooth Sailing

Interactive Drivetrain Profile

Top-Down Chainline Alignment

Angle: 0.0°

Visualizes the lateral angle of the chain. Extreme diagonal angles cause friction, noise, and wear.

Shimano Groupset

Select a groupset to explore different gear ratios and derailleur alignments.

Cockpit Controls

Front Shifter

RING: 2

Rear Shifter

COG: 10

Pedal Cadence (Legs Speed) 90 RPM

Ride Status Dashboard

Estimated Speed

28.4

KM/H

Leg Effort (Torque)

MEDIUM

Ratio: 2.27

Smooth Sailing

Ideal for rolling hills and maintaining a steady rhythm. The chain is running straight and efficient.

Shimano Shifting Academy

Put your knowledge to the test. Click a scenario, read the description, and shift to the correct gear combo!

Climbing DIFFICULTY: EASY

The 15% Alpine Wall

You encounter an incredibly steep hill on your route. Shift to your easiest gear ratio (Mountain Goat mode) so you can spin up without blowing up your knees.

Sprint DIFFICULTY: EASY

Downhill Descents

You are descending a long straight hill and spin out your legs. Shift into the absolute highest gear (Speed Demon mode) to maximize power output and speed.

Friction DIFFICULTY: MEDIUM

The Cross-Chain Trap

Oh no! You shifted your road bike into the Big Chainring + Big Cassette Cog. The chain is rubbing, making noise, and wearing down. Re-shift to a straight chainline.

Efficiency DIFFICULTY: HARD

Stoplight Quick Startup

You've stopped at a red light on a flat road in high gear. To accelerate quickly when it turns green, find a medium-easy cruising gear (approx. ratio of 1.7 to 2.1).