Ah, I overlooked the fact it's an MTB BB. That's the reason. The BB shell face to bearing face measurement on a Shimano road BB is about 11mm, but 10mm on MTB ones. 1mm spacer on either side or use a road BB.
The bike is mostly used for off-road riding so I'll stick with the spacers as I believe these are better-sealed. Thanks for the info!
@Tijmen started
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Ah, I overlooked the fact it's an MTB BB. That's the reason. The BB shell face to bearing face measurement on a Shimano road BB is about 11mm, but 10mm on MTB ones. 1mm spacer on either side or use a road BB.