This seems like it would have an easy answer, but darn if I can come up with one. I have an 07 Trek Fuel EX9 and bought it frame only. I built it up using a 68X113 Octalink BB and spacers so that it wouldn't come in contact with my frame. The BB has been used for ohhhh 8 years and needs to be replaced. Though now that I'm shopping there doesn't seem to be anything between 113 and 118. Though if I used the 118 I wouldn't need spacers and might have the proper amount of clearance. As it stands I could barely get my pinky finger in between the crank arm (either) and the frame. The 118 or 118.5 will add 2.5-2.75mm per side.