Weird clicking fresh after winter maintenance

So during winter I did some cleaning and bike maintenance, which included taking the rear wheel off, cleaning the cassette and read derailleur gears, cleaning the front gear (without disassembly) and changing the chain (KMC Z to KMC X if it matters). Today I have my first ride after this and I have encountered this weird clicking sound. It only makes the sound when under some load (the more load the more it clicks). Any ideas where to look?