My experience with 'Flat' Rate Rear Linkage from 1199/1299
Been 'dialing' my bike in suspension-wise for aggressive street riding and sport-touring. With the NIX30 in front and TTX GP in back, both valved and sprung perfectly for my weight and riding style, something just wasn't right. Long story short, swapped the rear linkage from a 1199/1299 and used the 'flat' setting, and everything is good! No more 'pogo-y' feel from the rear at slow speeds. No more 'packing' the suspension on turns and not being able to feel the rear tire. No more unpredictable rear swing arm activity. I can actually feel my suspension in the back properly 'suspend' me. The bike holds lines in turns much better. I can 'flow' much better through turns feeling a deeper connection to the rear tire. I can also 'point and click' much better through turns if I so choose, being able to dig in and steer through the rear tire. I can correct better mid-turn in case a turn suddenly pinches and becomes way sharper or I need to suddenly avoid something in the road. I read on other forums that I would perhaps have to go a spring-rate softer, or alter my valving, or that this mod wasn't really necessary unless I was tracking the bike, or it would be uncomfortable for street riding only, but not so. I'm still able to use my 7.0nm spring that was on it before. I haven't bottomed it out yet (though close), and backed-off preload about 1/4 turn to get the sag right again. Valving is just fine the way it was setup previously w/ C5R3. Only had to back off 1 click on rear compression to make it nice and plush. Bike is way more comfy rear suspension-wise than it was before. You can source the parts off EBay for pretty cheap. I consider it is a must mod for myself as I was no longer feeling safe/comfortable w/ the progressive linkage while pushing it.