cranks for a JIS bottom bracket My bike is a 2016 Brompton, I am thinking to swap current cranks. Current BB possibly is this one (a JIS square taper), model: stronglight jp400 119 mm.

http://brilliantbikes.co.uk/brompton-bottom-bracket-cartridges/849-brompton-bottom-bracket-jis.html


According to this doc, For Brompton, ISO cranks are not compatible with JIS BB 
http://bromptonjunction.com/wp-content/uploads/2015/09/ds-crankset.pdf 

So will this crank fit the BB? This seems to be a shortened Shimano crank (Altus).

http://www.sjscycles.co.uk/thorn-110-74-pcd-125-mm-alloy-crankset-silver-prod237/


The new crank need to be at exactly where the old ones are on the spindle to not to affect the folding.
Are all shimano square taper cranks fit JIS BB? Also the link mentioned it's a triple, how that will affect the chain line, if I just install one chain ring (Brompton needs only one ring)?
JIS, short for Japanese Industry Standard, is by the far more common and is the one used by all Japanese manufacturers including Shimano. As far as I know, the only manufacturers that still produce ISO cranks are Specialites TA and Campagnolo, and the latter only for track bikes.

Triple crank chainline is measured at the middle chainwheel, so you can use the number as it is.