Grinding sound when turning the handlebar. It drove me nut trying to figure out where it was coming from. I thought it came from my Jagwire links cable, so I grease the cable down with WD40 and the noise was still there. I ended up took the whole headset apart, and found that the plastic cover on the bottom bearing cracked. That piece is super thin, so it was a matter of time.VTR1000SP2 wrote: ↑Wed Sep 26, 2018 4:06 pmWhat were the symptoms of a cracked bottom headset bearing?asiantrick wrote:To the OP, please upgrade the FSA headset bearing asap. I cracked the bottom bearing twice with very low mileage on the bike. The FSA bearing is superlight but it's super fragile, and easily cracked. I upgraded to full Enduro bearing for my headset. It's a bit heavier but it's very durable and silky smoth. I also upgraded the compression plug since the stock one is heavy as fck and it slips after every 3 rides.
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I compared my Enduro bearing vs the FSA. The Enduro uses a flexible rubber on the bottom (very similar to Ritchey bearing) to cover the bearing while FSA use a thin plastic cover. I contacted FSA to figure out why this happened and is this a torque issue, yet they can't give me a direct answer. Cost me $100 to replace the bearing twice, and I could only get the FSA from Europe. Imo, I think the FSA design has some major flaws. Long story short, I've been on the Enduro bearing for 6 months now and everything still silky smooth.