Hey guys (and gals), so I think that I want to change out the front sprocket on my 1980 CM200T from the stock 15T to either a 16 or 17. From what I have read, this will decrease zippiness, but allow for more comfy 50-60 MPH cruising RPMs. I have tried tirelessly to find answers to these questions so please bare with me. It seems a 16T will fit, but will a 17T? Also, Does going up to either of these mean I will have to change the chain? Theoretically, it should decrease RPMs at higher speeds, but I cannot find any anecdotal evidence of this so I would love to hear from anyone that has done this to a CM200 or any other bike and what their experience was like. Thanks!