Long story short. Newbness implied.\n\n'79 Yamaha SR500\n\nJust ordered an Avon 325H19 AM20 front (1.85 rim) and an Avon\n110/90H18 AM21 rear (2.15 rim).\n\nHave absolutely no clue as to inner tube size/brand. Am seeing 300/325\nand 325/350 (or 350/400 and 400/450) tubes plus some metric stuff.\n\nNo decent local sources, will have to do the mail-order deal.\n\nAny help would be appreciated.\n\nTC\n\nPS I hope the tires are OK, employed by a tire company, and if I don't\nhave Avon's on the bike, I can't ride it to work without taking more\nthan a full ration of crap-bad enuff that it's a Yamahahmer. Got them\nthrough the employee purchase plan and am stuck with 'em.\n\nPPS is there a market (Ebay?) for a nearly new (nubblies virtually\nintact) 4.00-18 64V ME99A Metzeler-throwing in a moderately\nweather-checked (in between the tread blocks) 3.50-19 M33 Laser to get\nrid of it?