as the title says I need a new chain as I somehow managed to break mine tonight when I was just starting a trainer session. Bike is an Orbea Orca 60cm with Shimano 105 and a 10 speed cassette.

I think the chain broke as I accidentally did a gear dump the other day climbing a hill and then was shifting under load as I went the wrong way with the brifter..... stupid me put the chain on the small cog on the cassette and then in correcting the issue ran the gears fast to the big rear cog.

Thanks for your help. I am glad this happened at home and not on the freeway or some other road out here in rural Oregon.