Much has been written about work done to improve the 800XC suspension. Some of which has been documented in the Farkles thread, "Preparing for the Dirt" thread, and elsewhere, such as AvMech's thread. Considering the number of folks who have made mods, and the number of choices out there, having a dedicated thread might make it easier to find information from those who have been there, done that. Consider this as a common place to copy existing posts from elsewhere, or, to post new stories of mods, vendors, and parts used to improve the 800XC suspension. Also a place to ask questions of the FFs who may have the answers. I'll start with what I have done so far: Bike is a 2013 Tiger 800XC Rider is 6'1" and 240 lbs. Stock XC Spring Rates per RaceTech (Edit: added this info August 14, 2014) Front - .492 kg/mm Rear - 9.8 kg/mm Installed -Race Tech Compression and Rebound valves in the forks. Tuned to my specifications. Race Tech Fork Springs .80 kg Race Tech Shock Spring 14.3 kg Initial results -Front Sag (laden) ~ 20% of travel with 5mm preload spacer Front Sag (static) Rear Sag (laden) ~ 40% of travel with Preload adjustment at full Rear Sag (static) No Preload - 50 mm; Full Preload - 38 mm Currently, this modification is a remarkable improvement over stock. The bike feels planted and the rocking horse behavior of the OEM springs is gone. Brake dive is significantly reduced. Tracking on rutted and on washboard surfaces is much improved. Paved cornering is much better with braking and throttle changes having little effect on the bike like it did before. Ride height is increased by about 1 inch. More usable travel is available. The front is a little harsher on the pavement than I like. Reaction to small irregularities in the pavement is sharp and transferred to the rider. I'm comparing to riding the same roads on a KTM 950 Adventure with aftermarket valves and sprung for my weight. The 800XC front end seems to bounce off small things like expansion joints, patches, and small pot holes. I think the 20% laden sag is not as plush as it should be. Race Tech's Spring Calculator may need some fine tuning. The sag should be more balanced, percentage-wise, front to rear. I am aiming for something between 25% and 33% laden sag at both ends with zero preload adjustment on the shock. Fine Tuning: The tech at the suspension shop I'm working with has offered some suggestions. Go down two steps on the front springs to .70 kg. This should get us in the ballpark for our Sag target. If it is then over 33% we can put one of the .80 kg springs in one leg to reach a happy medium. On the rear, he thinks the spring rate might be right for the application, but it needs more preload. His plan is to machine a spacer (15 or 20mm) to get us in the ballpark of 25 -33% laden sag with no Adjustable Preload used. This will leave room for adjusting for luggage, passenger, etc. I'm shooting for the baseline that AvMech is so thrilled with on his bike. I'm not quite sure how to determine that the shock spring is the right rate. As I understand it, the spring rate is what affects action through the stroke. The overall length of the spring affects the need for preload. When I back the adjustable preload off about ten or fifteen clicks it feels plush back there. When I dial it up to minimize laden sag it is okay, but not plush. So, I'm thinking we are on the right track by adding a spacer, as long as the total stroke can be reached before the spring is fully compressed. Looking forward to feedback on this from others with experience along these lines. As well as feedback from those owners already using Ohlins, Traxion Dynamics, Wilbers, and other products available for the Tiger 800XC regarding their experiences with these products.