How do i know which crank size bearings to get?

[Taggy]

I have got my 5e crank, looking at it its got some light tarnishing on it where its picked somthing up on the journal, but its still smooth as silk so not worried. I noticed the crank bearings come in different sizes, i.e standard and oversize 0.25 and 0,50. How do i know which ones i need?

Do they need to measure my crank journals?

Does anyone know the specs so i can give them to the machinist dude.

Also are the 4e/5e crank bearings all the same size?

[Flaminsam]

are you having the crank ground? would be a good idea to get it at least polished and balanced while its out. yea the machinist should measure the crank journals and let you know what size you will need.

[Taggy]

i don't think it needs grinding, just a good polish, how do i know what the standard size journals should be, does anyone have the specs?

[turbo Grant]

If you want to replace like for like they have the number on the back of the bearing shell