Sorry if this is the wrong place, but I'm new to cycling - can I just check these are definitely 700x40C tyres and I need to order a 700x40C inner tube? :
700x40c HAPPY MEDIUM PRO TUBELESS READY - CFB Bike Shop
KENDA KOLESARSKI PLAŠČ 700X40C
Amazon.com : 700x35C/38C/40C/43C Bike Inner Tube with Schrader Valve 48mm, 2 Pack Premium Butyl Rubber Bike Tire Tube with 2 Rim Strip for 700c Road Bicycle : Sports & Outdoors