Geraint Thomas relinquished the overall lead at Tirreno-Adriatico after he suffered an untimely issue with his bike in the closing kilometres that saw him lose 40 seconds to eventual stage four victor Mikel Landa (Movistar).
Earlier, Team Sky had led the peloton to catch a long range break that led until the final climb, with excellent work from Jonathan Castroviejo, Gianni Moscon and Salvatore Puccio helping to reel in the escapees who led by more than six minutes at one point.
Once the break had been caught, Astana led the peloton briefly on the opening kilometres of the Sarnano Sassotetto ascent with a fierce pace to setup a solo push for glory from Miguel Angel Lopez, who was eventually caught and dropped by the chasing quartet, with Landa coming out on top.
You’re riding for 250km, you’re spending a lot of energy and it didn’t go as we wanted, but we’re ready for what’s coming next
He told TeamSky.com: “I was happy with my form, but actually it’s bad luck with G and I had to hang on because of my place in the GC. I knew Chris [Froome] was behind and he could help him
Thomas added: “I felt so comfortable and the boys rode really well, we were well in control and as I was shifting into the big ring the chain slipped off and got jammed and it was stuck in the frame which meant I had to get a spare bike.
1. Mikel Landa (Movistar) 6:22:13
2. Rafal Majka (Bora-Hansgrohe) s.t.
3. George Bennett (Team Lotto-Jumbo) s.t.
4. Fabio Aru (UAW-Team Emirates) +6"
5. Ben Hermans (Israel Cycling Academy) s.t.
14. Michal Kwiatkowski (Team Sky) s.t
1. Damiano Caruso (BMC Racing) 17:41:49
2. Michal Kwiatkowski (Team Sky) +1"
3. Wilco Kelderman (Team Sunweb) +11"
4. Mikel Landa (Movistar) +20"
5. Geraint Thomas (Team Sky) +26"