Chris, what would be the difference? ...when you say standard, is that the disc brake model?
Topeak Explorer 29Er disc, Topeak Explorer, Topeak Explorer Disc. mostly so I can lighten my backpack, bike locks, water, small tools and first aid
Good question, @mamerc ! The Topeak Explorer racks can carry a lot more weight, about 50 lbs and are structurally sound. The disc brake version is built a bit wider a the rear stay connection points to accommodate the extra width. Definitely offload that extra weight in your backpack!