Here's what came with my M15. I'm replacing it all now, so I happen to have access to it. These have all been adequate lengths. The caveat is that a line that's a couple feet too long only costs you a couple extra dollars. A line that's a couple feet too short makes for pretty expensive fender pennants. I have the original main halyard setup, with cable running to sheaves at the top of the mast, where it connects with the "rope" halyard. My main halyard is 31 feet. Should you replace the cable with line, add roughly the height of the mast above the boom. (I do understand why some folks don't like the cable -- on my boat, the swage that forms the eye in the end of the cable, to which the line is tied on the forward side of the mast, tends to get up into the sheaves housing and jam. But I'm not going to do anything about that for now. In 24 years I've only had to lower the mast once to free the jam. And I know for sure that the cable isn't going to stretch.) My jib halyard is 40 feet. I haven't used a jib downhaul for 2 decades. Easy enough to estimate. Length of your forestay plus distance back to about mid-cockpit, allowing extra for turns through fairleads and clam cleats. Topping lift is 20 feet. Sheets have to be long enough so that you can trim way down going to wind, or stretch the sail way out to the end of whisker pole on wing-and-wing, and still have plenty of slack on the windward sheet. If your stopper knot on the windward sheet is fighting what you're trying to do with the sail opposite it, you can't possible trim the sails properly. Sheets on the working jib are 14 feet each side (28 total length, tied midway at the clew.) Sheets on a 130 jib (after-market add-on) are 19 feet each side (38 total l ength, tided midway at the clew.) This measurement obviously isn't for just ANY genoa, but a 130. I don't remember why I chose that length, but I do know that sail is often stretched out to the end of a whisker pole. My traveler is about 6 feet, but don't buy that length. Get 8 feet so you've got length to work. You're going to need extra for tying the stopper knots at the stern quarters. Knots always use up more line length than you think. Don't guess. Have your boom in place and put the traveler, block, and mainsheet all together before you tie off the traveler. Only then cut off the excess length. Halyards are 5/16. Sheets 3/8. Traveler 3/8. Topping lift 1/8. I think that's all of them. ************** Looking for a car that's sporty, fun and fits in your budget? Read reviews on AOL Autos. (http://autos.aol.com/cars-BMW-128-2008/expert-review?ncid=aolaut000500000000... )