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Select your groupset and instantly see every gear, speed, development and steps.
Coloured bands — the band below each curve grades the size of the jump between one gear and the next. The same step % appears between the gear cards below.
Development curve — each dot is one gear, plotted by how far the bike travels per crank revolution. The curve rises left to right: slowest gear on the left, fastest on the right.
Two lines — the upper curve is your big ring, the lower is your small ring. Where they overlap in height is the speed range covered by both rings.
× marks — cross-chain gears to avoid. Big ring with the two largest cogs, or small ring with the two smallest, angles the chain across the cassette and accelerates wear.