Originally Posted by
koenbro
Has a 7 speed 11-28 cassette, and a 45-36-20 triple in the front
The small ring in your photographs is definitely not a 20-tooth. It looks like it's closer to somewhere in the 26T neighborhood.
Also, are you sure the big ring is a 45T and not a 46T? 45T is theoretically possible, but would be unusual, and my eyeballs are getting more 46T-esque vibes from it.