These Half Framebags look good on most bikes because the sizes differ in small increments, allowing you to dial in your fit. We try to accommodate water bottles on the seat tube by tapering one end. The small version tapers down to two inches in the rear, which is great for smaller riders or bikes with compact geometry (i.e. sloping top tubes). All bags come with extra long velcro straps that can be trimmed or moved around to different slots. Also, all three sizes come in ten different colors!