What length bb for this Bontrager chainset?

[mattbrown]

Recently won them, but cant find anywhere the bb length they take? Want 50mm chainline. I could assume but dont want to buy lots of bottom brackets until i find the correct one.

 

[Moqi]

Re:

I don't know. However they appear to be isis cranks and as far as i can ascertain the available spindle lengths are 108/113/or 118.

My betting is that they are probably 113mm spindle. I'd buy the cheapest 113mm spindle one i could - you can then decide either way if incorrect. Somebody might have a knackered 113mm on here to work out length. Otherwise you could go single ring up front?