2011 Specialized Allez. I did my first double century yesterday and bike was performing without issues even during descent even at speed. More than half way through the ride during a steep descent while going 40+ MPH, the bike started to wobble/shaked so bad that I could barely control it and almost ate the pavement but managed to stop.
I checked the wheels, spoke and headset and they were tight. Pretty scary moment so I decided to slow down a bit during descent and it happened again around 25 MPH. Slowed down to 15 MPH and it happened again. With about 70 or so miles to go, I get worried whenever I see a descent and had to really slow down almost to a crawl. Any ideas on what would caused this? taking the bike to shop tomorrow.