23–24 January 2027 · Veliky Novgorod
ЗИМНИЕ ВЫХОДНЫЕ ВЕЛОКРОССА · 3ВВ
Два дня ТИПАЦИКЛОКРОССА: Cyclocross, Gravel, Fixed gear, МТБ и беговой кросс. Один день или оба.
TRANSMISSION RANGE
To the calculatorsFor 1x and 2x: percentage range, lightest and heaviest gear, full gear chart, steps between cassette sprockets, doubles for a double setup, and check if your gear ratio can handle your climb.
How to choose gears for climbs
What we count
Range, %
Gear inches
Development, m
Speed by cadence
Cassette steps
Duplicates 2x
Ascent check
The recalculation happens automatically, there are no buttons. The link to the page saves your setup — you can share it in chat and argue about gears substantively.
Transmission
The preset only fills this field — then straighten the teeth with your hands. Manufacturers change layouts from group to group, so if the preset is lying, you will see it and fix it.
Wheel and cadence
Transmission range
520%
The easiest gear
40 × 52
The hardest gear
40 × 10
Range = heaviest gear divided by lightest. 520% means that heavy gear is 5.2 times longer than light gear.
Ratio 0.77 · 21.6" · development 1.72m · 9.3 km/h
ratio 4.00 · 112.1" · development 8.95 m · 48.3 km/h
All gear ratios
In the cell, the gear inches are large, the speed at the selected cadence and the development per pedal revolution are small.
The lightest transmission is highlighted in orange, and the heaviest is highlighted in black.
Steps between cassette sprockets
We consider the step from the light chainring to the heavy one: by what percentage the gear ratio increases when shifting.
Duplicates and crossover
Gears that differ by less than 2.5% are considered the same: you can't feel such a difference with your feet.
We only count cross-over for 2x: there's nowhere to shift in front for 1x.
Ascent check
Speed uphill
7.2 km/h
Power needed
220 W
Watts per kilogram
2.59 W/kg
Share of FTP
88% FTP
Tolerable: working pace, but it will be noticeable on a long climb.
We count by the lightest gear: speed at a given cadence, and from it — power on the rise.
How to read it
Range — the ratio of the heaviest gear to the lightest in percent. For 1x with a 10-52 cassette it's 520%, for a road 2x with 11-30 — about 470%, but it's distributed much denser there.
Gear inches — the wheel diameter of a penny-farthing with the same gear ratio, the usual currency in discussions about chainrings. Development — meters per one pedal revolution, from which the speed is derived at a given cadence.
Cassette steps — how much the gear ratio changes when shifting to the adjacent sprocket. Up to 15% the shift is almost unnoticeable, 18–20% and higher — 'gap': the cadence drops, you have to choose between 'too hard' and 'too easy'.
Duplicates — with a 2x system, some gears on the large and small rings are the same. A difference of less than 2.5% can't be felt by foot, so a 2x system always has fewer actual gears than the product of the chainrings.
crossover — the cassette sprocket where the small ring no longer provides a gear ratio lighter than the lightest gear of the large ring. From here and higher on the cassette, it's more advantageous to ride in the large ring: the chain runs smoother.
Ascent check — the speed in the lightest gear at your cadence turns into power according to the classical resistance model: gravity, rolling (Crr 0.008) and air (CdA 0.36). W / kg is calculated by the weight of the system, so for pure watts per kilogram of rider the figure will be slightly higher.
We take the wheel circumference according to ETRTO as π × (rim diameter + two tire widths) — accuracy of the order of percent, this is enough to compare gears.
