Ok, thanks all. Current setup is 68mm shell with 2x spacers on the DS and 1x spacer on the NDS. So I should be sorted if I go for a MTB one which has a bit more allowance with the plastic tube and more thread on the DS cup. And just check my BB tool fits...
Shimano 16-Notch X 44mm: Fits 16-notch, 44mm diameter external bearing bottom bracket cups including Shimano® Hollowtech II, Campagnolo® Ultra-Torque and Power Torque, Race Face®, FSA®, SRAM®, Truvativ®, Chris King®, and Phil Wood® outboard bearing. Also fits disc brake rotor lockrings with 16 external notches. NOTE: Will fit Shimano TL-FC24 and TL-FC25 adapters.
Shimano 16-Notch X 41mm: New for 2015. Fits Shimano® BBR60 (Ultegra 11-speed 6800 Series) and BB-MT800 (DEORE XT M8000 Series ) bottom brackets.
Shimano 16-Notch X 39mm: New for 2015. Fits Shimano® XTR BB93 and Dura Ace BB9000 bottom brackets.
Ok, thanks all. Current setup is 68mm shell with 2x spacers on the DS and 1x spacer on the NDS. So I should be sorted if I go for a MTB one which has a bit more allowance with the plastic tube and more thread on the DS cup. And just check my BB tool fits...
BB52 it is, then. Bloody hell, glad I asked!