Sorry if I'm supposed to post an intro of some other social fluff... I'm not an "ADVrider" as such, just done a few long trips on my sport tourer (a 1985 FJ1100 with classic plates). Google research in the past has shown me folks here post some interesting suspension mods and such, figured I'd share mine. Bike's been torn down a couple years while I build the suspension / steering, am about at the point of putting engine back in, building wiring & controls, etc. Hoping to make the end result dirt-road usable, mostly by way of slightly higher ride & seat, DP tires tires, skid plate, and high pipes. Travel is 3.5" (stiff, and very strongly progressive) in back, 5.5" (straight rate) in front. These pics are all very much WIP. Frame / engine / drivetrain / wheels are 1981 Yamaha XJ750rh. Tank is Virago 750, fits pretty well on the original frame mount bits after raising rear 4 inches and re-positioning front stops. Has a MASSIVE tunnel, my battery fits under there. Rear shock is from BMW Montauk, which is same weight and travel as XJ750. I played around measuring shock length vs wheel position for a lot of mounting points until I found something that seemed to give the right travel and wasn't regressive. Later testing showed is was off a bit (less travel / stiffer than expected & strongly progressive) but not enough I feel the need to re-do. Front is based on Hossack design, but after a lot of shop noodling and head scratching, ends up more like Fior's B'ol Dor bike. Shock is GSXR1000, brakes are Yamaha blue dots, keeping the stock cable actuated MC (will fab cable pull ratio adjuster if needed) so I can run reverse levers. Steering link design was suggested via MC Chassis mailing list, functionally similar to the one Alan Lapp used on his DBC bike. Handlbars mount to a BMX stem and bicycle headset bearings are mounted in reducer cups inside motorcycle head tube. BMX stem is adapted to support swing link for the steering linkage. Target geometry is 17.5% rake and 3.5" trail, with 50% anti-dive - the steep rake inspired by Tony Foale's experiments with rough surface stability. Rake, trail, wheelbase, and dive are all adjustable to various extent (with some obviously affecting others). Steering lock is 45 deg or more each way - uncommon for Hossack fronts, and something I made a priority of because I figure I'll be duck-walking the bike in tight quarters a lot (in the shop, garage, at events, etc). Wheelbase is slightly shorter than stock (wanted more front wheel weighting, the XJ's are a bit ass heavy), made possible by the vertical wheel path. Dive adjusts via shims under the lower ball joint, just as in automotive designs, with 1mm of shim giving a roughly 5% decrease in anti-dive. With no shims, it should be roughly 100%. As assembled currently it has a half inch (12.5mm) shim. I'm not sure what a "good" amount of anti-dive for daily / casual use is, and apparently neither is anybody else (I asked on the MC Chassis mailing list), which is one reason I'm building this - I'd like to see what its like to ride with various amounts of kinematic anti-dive.