I bought a Diamond Back Ascent MTB with a Cro-Mo frame and forks. I had a lot of trouble with the headset coming loose. Tried preplacing the headset; still no good. I worked out in the end that the headtube top and bottom was not parallel; so the headset bearings have had a massive amount of load on just one part of the bearing ever since the bike was new. I took the frame to Mercian Cycles (who manufacture bike frames as well as do repairs) in Derby, they faced the headtube. This has sorted all the headset problems out straight away. The bike now works properly, which is something it has never done before in the 30 years since it was brand new!
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Diamondback Bicycles is a major bicycle brand that is based in Kent, Washington.
