Last year I bought a Norco Search 105 Hydro (https://www.norco.com/bikes/2018/dirt-dropbar/gravel/search-aluminum/search-a-105-hydro/) and from the beginning had bottom bracket creaking. Brought it back and they put in a 2mm spacer and creaks went away for the season. About half way through this season, they came back.
I tried to remedy myself, pulled off the cranks, pedals, bb and cleaned it all up and re-lubed and assembled. Was good for a ride or two and creaks again.
So I thought maybe it was the bb itself so went to purchase a new one but this is where I am confused...
- Frame is 68mm
- Original BB is a Shimano threaded mountain SM-BB52 (68mm)
- But cranks are a road pair Shimano FC-RS510
I can't seem to find a 68mm mountain BB, everything is 68/73 which doesn't work with the road cranks because I need the spacers but then the road spindle isn't long enough. I bought a BBR60 (road BB) but the threads where resisting and I didn't want to force it so I returned it.
Any advice on how to move forward? I'm confused why they chose to a put a mountain BB with road cranks? Also should a road BB work in this setup? Did I just need to give threading it a little more muscle?