30-31mm measured width tires easily fit on a disc SL6. I’m running a Conti GP5000 TL 28c on the rear on my SL6 sport, 5mm of clearance at the chainstays, way more at the seatstays. Front is a 25c GP5000TL. Allen key in the pictures is a 5mm. I bought the Sport with 105, asked the shop to not assemble it. Got it home, tore it down, installed Ultegra Di2 and other goodies. I wanted the BSA bottom bracket. The round seatpost is nice since it’s standard, but the D post would have been nice, too.
