First of all if I have the wrong forum, I apologize. I did look for a technical forum but did not find one. My bike is a Road bike so here goes. After many years of time off the bike due to family, I have decided that I need to get back on the bike as I have more free time. The bike is a Steel Frame, 700c clinchers with Shimano 600 and DuraAce throughout with 7 speed hub. Have been riding for a couple of weeks and had one issue that I can't seem to fix. When in the gears I use for hills, and under load, small sprocket on the front the chain feels like it is slipping, it's not on every revolution or in a particular place. It makes an audible click and then reengages as I keep peddling. I have tried the micro adjustments on the down tube and it doesn't appear to make a difference. I have also tried to see what the derailleur is doing but have not been able to see as I go up hill. Rear Derailleur is 600 SIS. I did replace the chain after I moved the components from an alloy frame to this one and it had an issue on the other frame too" Any assistance would be appreciated. Thanks Allan