I ride ~ 2000 miles a year, 60% unpowered. I use $26 kenda or giant knobby tires, I get a year out of them. No flats if the knobs are taller than 3/32". I recycle the schwinn or giant tubes to the next tire. I change tube when flat out on the road. No liners or slime, a flat every 2 or 3 years from huge metal shards or truck tire shreds with wires sticking out. .
Chain 5000 miles, 2 KMC, (took 2 116 link chains to make the replacement). I'm on the third from Sunlite which at 120 was longer than any other in stock. Still 4 links short. Rear sprockets 11000 miles no visible wear. Front small sprocket (of triple) showing wear, I'll change it this winter. Brake pads 1 front set so far, rear I do not use it much. Twist shifter, I have used 3. Brake cables one each. SRAM front derailleur, holes wore out ~8000 miles. SRAM S3 derailler takeup, 1 was destroyed when it was poked by a stick on garbage day. New one is a SRAM X3. I've changed the shifter cable, housing, shifter, rear hasn't shifted since 6000 miles. Extra length of bike may be the problem. Would shift down if I was strong enough, but spring will not shift it up. Spokes/wheel rims, zero. Seats, I've used 6, wore out padding on one. I'm still not happy, sewing a cover over an 8" tall sofa cushion over a hard flat seat. Hard to sew naugahyde. Takes pliers to push & pull needle.
Geared hub motors, first one ebikeling plastic gears wore out ~4500 miles. 2nd one was killed when ASI controller shorted 2 pins in the rain & burnt the wire harness off the Mac12t motor too. 3rd motor was a used 350 w 36 v bafang, after 500 miles burnt the winding climbing the 60th hill of 77. Not strong enough for that hillyroute, I was running 48 v instead of 36. 4th 350 w used bafang motor got 1000 miles before the state started construction on the flatter route, restricting lanes to 108" between cones. I stopped riding to summer camp for 8 weeks while I ordered a 500 w geared hub from China. First set of spokes 2 mm too long, 2nd set of spokes didn't come in at 8th week by which I managed to rewire the 2nd motor to fit a square white hall effect cable and ring terminals on the phase wires. 2nd motor is 1000 watts, great for hills but wouldn't run on the 3rd controller, a 500 w. Changed to 4th controller 1000 w. 1st ebikeling controller was running the 350 w bafangs @7000-9000 miles when it developed an error code (pas pickup wiring) which was a complete lie. Bad pcb via I guess. Motoring on successfully on 1000 w Mac12t motor with 500 w motor spare in garage.
Battery, 1st & 2nd defective as delivered from Amazon & Ebay. 3rd battery from Lunabikes has lasted 5 years, 10000 miles, still fine after ~400 charges. (Rode bike unpowered for 1000 miles before electricity added). Battery is not used in the winter, not big enough to go 30 miles & 77 hills at below 55 F. No heat out at the summer camp anyway. Trailer is as drafty as a barn. I just bought the original farmhouse out there, brick with LPG heat, will be rebuilding a car engine to drive out there some in winter.