Globalti
Legendary Member
I had some loud clicking and clunking from my BB area so I took out the BB30 FSA cranks and found everything filthy and manky with quite a bit of grit around. I was surprised to see signs of erosion on the surfaces of the BB axle that fit inside the bearing inner races, despite them being a snug fit. However against my expectations the BB30 bearings were in good nick so I left them (had found replacements at my local bearing stockist for £4.95 each) and cleaned everything up before greasing the surfaces with Copaslip and reassembling. The service has cured the clicking and clunking but I have two questions:
1 - I torqued the 10mm bolt to 40nm as instructed then rode the bike up the street and re-torqued, finding that the bolt turned by around 45 degrees before the torque wrench clicked over. This afternoon I rode 39 miles and then recheked the bolt and it turned another 5 degrees or so. Is it normal to have to re-torque this bolt two or three times?
2 - What causes the small areas of erosion that I saw on the machined surfaces of the BB axle, where it fits snugly inside the bearing inner races? Should I worry about this?
1 - I torqued the 10mm bolt to 40nm as instructed then rode the bike up the street and re-torqued, finding that the bolt turned by around 45 degrees before the torque wrench clicked over. This afternoon I rode 39 miles and then recheked the bolt and it turned another 5 degrees or so. Is it normal to have to re-torque this bolt two or three times?
2 - What causes the small areas of erosion that I saw on the machined surfaces of the BB axle, where it fits snugly inside the bearing inner races? Should I worry about this?
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