Need a 40 or 42 T set up, cheap
Working on a fast and light commuter. Good weather only, no fenders, no rack, might go with a frame bag. I have an older Japanese steel frame and most of the parts. Looking to do a 1x9/10 drivetrain. Drop bar and rim brakes too. What would be the cheapest /easiest way to get a 1x chainring? I have a bunch of square taper cranks. Some of the older 39/53 road chainring set ups and some mt 9 speed triples. Can you use just the inner on an older road double? Seems the outer of a 9 x mt triple will not yield a good chainline. Run the 42 in the middle position? I realize for $100.00 or so a nice track or mountain single can be had.