Thats the bike.
42x12 is nearly equal to 53x15. Would you call it a slow gear?
Everyone is different. I don't have any problems pushing 48x12 on the flat out to 30-35km/h for as long as 3 hours. But peddling really fast just to acheive the same result? I don't see the point. With my 44x12 on my nice MTB I can get 36-40km/h for the same cadence it took to maintain 32-35km/h on this bike. With the 48x12 on the old beater I could maintain a much higher cruise for less perceived output. I don't like it. Besides, the top speed I could get out of her was 44km/h while I've managed 56km/h on the other bike (much nicer, lighter etc but still...)
Found a dude with a triple set that includes a 48t ring he will install for me for $20, sadly I didn't carry much cash today so I'll go back ASAP and get him to install it for me. I really don't like the feeling that bike gives me at the moment. Despite the fact its commuter/beater it still has to FEEL good to ride.