The centre-back made the short move from Swindon on Tuesday after drawn out negotiations with the newly-relegated Ashton Gate outside.
And he believes the size of his new club persuaded him to leave The County Ground.
"I know it's a massive club with ambitions to get back into the Championship and I'm looking forward to being a part of those plans," he told City's official website.
"I want to have a good pre-season and push my way into the team. Hopefully I can then kick on throughout the season and win the majority of the games to help the team.
"There are a couple of weeks until we come in for pre-season and I'm looking forward to it. I'll have to get into the gym now and keep ticking over until then - I'm looking forward to starting."