Hey guys. I had a 2x7 road bike and I decided to upgrade it since I use it every day. I bought new wheels and a complete second hand 2x10 tiagra groupset. The components were in good condition, the only thing was missing is the chain. So I put a new one on, but it wasn't seem to be working, it was slipping a lot. My colleague told me to change the cassette because its too worn. So I bought a brand new tiagra cassette that matches the groupset. So it's basically a brand new cassette and chain. Well, that didn't solve the problem. The chain is still slipping even though they are not used. The small ring on the front is a bit bent so I thought it must be that, but no because it's doing the same with the top ring as well. It's slipping even if I don't put pressure on the chain just using the bike normally. What could cause the problem?