I posted this in an other Forum, I copied it here for all to see.
1" ( ONE INCH) is equal to 2.54 cm. So a 20" bar equal to a 50.8 cm"s
Standing in some thing over 30" (76.2 cm) would be rough over time, walking
in one in a open area would be rough, but possible. Just don't try to go through
doors, unless they are very wide. If you are laying down, or sitting, then you can go
much wider. Like said before, make some cheep's and try them out, see what
work's for you. RADER