Mike_GMT80 wrote:Also, why has this automatically been posted on the footer of my first post??
“I'm a trendy consumer. Just look at my wobbly bog brush using hovercraft full of eels“
AFAIK, That's to replace the automatic footer posted by some devices - don't ask me why, but I think if you ceck the forum rules, there's a suggestion you should remove it, so that's a prompt to do so. (PS Graham has dealt with that.)
I think you would be better served by getting dimensions from vendors, rather than speculation.
Crank length is important, because if it's wrong, you can eventually damage your knees. There's a formula somewhere on here from CJ explaining the calculation to work out the ideal for the individual rider. Having said that, most off-the-peg bikes do one size fits all.
Longer cranks = more leverage but a larger circle for the pedalling feet.
PS I've looked back and found some threads about the importance of crank length, but not the formula I thought I remembered. This is linked by gaz in one thread and it's still good stuffhttps://www.sheldonbrown.com/cranks.html