PEDAL Distance between holes

I wanna improve a pedal of bike to frame my uniclycle, cause unicycle isn’t common here in Brazil.
I would like to know how is the distance between holes.
My actually pedal is 170mm.
Thank You
Flavio M.
São Paulo - Brazil

I think you mean the distance between the two holes in the crank - the one for the axle and the one for the pedal. That is usually 170mm on a bicycle.

On a unicycle, the common sizes are:
89 mm
102 mm
110 mm
125 mm
127 mm
140 mm
150 mm
170 mm

The most popular sizes are between about 125 mm and 150 mm.

Shorter ones go faster on the flat; longer ones are better for hills.

Does that help?