I did about 300km on a test bike before I decided to buy my Inazuma. My bike had the 15 tooth front sprocket fitted before I took delivery. So far I have only done about 650km on it, none in heavy traffic, but I can't say I've really noticed any difference at slow speed. I reckon that with 6 gears to play with I should usually be able to find one that suits, and although I haven't deliberately tried it out I think that 2nd would still cope with dribbling through traffic anyway. If it's fine tomorrow I might have a bit of a play and see if I can answer the question a bit better. Cheers.