May 2013 / 9200 miles / On the second BB, 7000 miles on this one, quiet when cold but gets noisy as it warms up at any speed, particularly loud at anything over 65mph, running on Redline shockproof oil at the moment, slight improvement. / Steel sprocket for last 2000 miles but no change from earlier alloy ones. / 2014 chassis with NVH now, again, no change to BB noise from earlier chassis without NVH.
