Brucey wrote:sometimes you just can't square the circle and get a decent sized chainring in the right place for a 1x setup. In such cases you can end up choosing between a bad chainline, fewer gears (shorter cassette at wider chainline) or more chainrings. If you want low Q also..... well I think it is going to be a compromise.
cheers
Indeed, hence the query....it's an FC-T551 Deore trekking triple (48/36/26) c'set, 175m, 181m Q, 50mm chainline on a 68mm SM BB52 B/B (with spacers) with 15mm+ crank inner-stay outer clearance on both sides, 120mm chain stay width (outside-edges). I'd like a 42t, single ring, 50mm-ish chainline replacement with a lower Q of around 155-160mm that I know will fit before I order it but not an easy one to work out without a bunch of spare cranks to hand to try.