TRANSFER CALCULATOR
To calculatorsFor fix and singlespeed: gear ratio, skid patch wear points, footage development, gear inches and gain ratio, cadence —speed table and equivalent pairs of stars ±2%.
The link to the page saves your layout — you can throw it into the chat and argue about the transfer in a substantive way.
We count according to ETRTO 622-23.
90 rpm is highlighted as a landmark. If more than 110 is obtained for the desired speed, the transmission is too short, less than 70 is too long.
Pairs of stars with almost the same gear ratio. Click on any one to substitute it in the calculation.
Ratio — how many revolutions the wheel makes per revolution of the pedals. Below 1.9 — bike polo and stunts, 2.3-2.7 – universal urban range, above 3.2 — track and sprint.
Skid patch — the number of dots on the tire that are erased when skidding. It is considered as the rear teeth divided into nodes with the front ones: the more points, the smoother the wear. If the front star turns out to be odd after the reduction, the two-legged skid doubles the number of points.
Development — the meters that the bike passes in one turn of the pedals. Gear inches is the same in inches of the equivalent penny-farthing wheel, the usual currency in conversations about fix.
Gain ratio — Sheldon Brown measure: the ratio of the distance traveled to the distance traveled by the pedal. Takes into account the length of the connecting rod, so it's more honest to compare gears on different curves.
We take the circumference of the wheel according to ETRTO as π × (rim diameter + two tire widths). For accuracy, you can enter your own rollback measurement — the same way a bicycle computer is calibrated.
The idea and method of calculating the skid patch is from the Fantastic Fixed Gear Calculator of the SURFACE team and Sheldon Brown's tables.