Going to build up a cx frame with 68mm bb and 135mm spacing. Fitting an slx mtb cassette with a sora double road crank 34/46 . Im unsure wether to use a road or mtb bb. Im thinking it could be an mtb with a spacer on the drive side due to mtb rear end spacing

But im open to the input of people who actually know what they are doing 🙂

Cheers

Use a road bb. An mtb bb with a spacer will be the same (road cups are wider).

Just realised the road crank ive ordered doesnt come with a bb doh… so i have an mtb bb to use. Which side and size spacers ???

2 drive side 1 non drive side i think