The Fox Racing Shox 32 Float 120 G2 CTD has a 51mm offset, and is a perfect match for the Ibis Ripley. In fact, if you're not putting this fork on a bike that was designed for the G2 offset, you're going to throw off handling characteristics.
The fork features CTD, where one lever quickly and easily switches the fork's compression to ideal settings for the task at hand. The Climb setting adds plenty of low-speed compression to mitigate bobbing when standing on the pedals. Trail mode offers moderate low-speed compression to balance efficiency with optimum trail manners, it's also independently adjustable with three settings; soft, medium, and firm. Finally the Descend setting features the optimum high- and low-speed compression for plush action on steep and aggressive sections of trail.
The 32 Float 120 G2 CTD comes in either Black/Blue or Black/Green (matched to the Ripley) and has the smooth and durable Kashima coating on the stanchion tubes. It only comes with a tapered 1.5 to 1-1/8in steerer, and utilizes the stiffness-enhancing 15QR axle.