Hey all, I'm interested in changing my sprockets and have a couple of questions. Just need your advice and opinions on a couple of things. My bike has done about 6,000kms. If I changed one sprocket, would I have to change the chain and other sprocket too? The standard teeth on the STR are 16T front and 47T rear. What would be the best combination for street riding, mainly commuting: -1 tooth at the front and standard rear (15T/47T) - would this be too aggressive for the road? and does this put more strain on the chain compared to going bigger on the rear sprocket? Would the revs be annoyingly high when cruising? -Standard front and +2 rear (16T/49T) - I hear this is good for street riding but the 49T rear is really hard to find and will have to be ordered from Italy. Would this give it enough punch at lower revs? - Standard front and +3 rear (16T/50T) - The 50T is a lot easier to find than 49T and can be found in many brands. I was told by a mechanic that this will have a similar effect to -1 at the front (15T/47T). I would need a longer chain with this combo. If I need to get a new chain I'm thinking of getting an X ring - are there any negatives to this compared to an O ring? I mainly commute on my bike so I'm usually in traffic. What I want most is better response and more punch on the lower end. Any advice would be much appreciated.