I've read your posts, and lots of others.. I've found out what they're talking about, when they say bikes with too much trail is dangerous in the corners; if the steering is too slow, the front wheel will not follow a natural line around a bend in the road. It will tend to follow a wider arch. If you're expecting it to steer quicker, you will lean into the curve and the bike could fall over because there is not enough force acting perpendicualr to the curve to counter your lean. The result will be a lowside crash.
Not that I'm a pro rider, but I think this would be a bigger problem for inexperienced riders. I've encountered similar effects when entering curves at 100mph with a passenger on the bike. The bike is heavier than normal and wants to "stand up", resulting in a wider arch. Inexperinced drivers will often react by turning more into the curve, resulting in the bike standing up even more and you risk driving off the road on the outside of the curve. Or crashing with cars in the opposite lane. This is countered (opposite to what inexperienced drivers may think) with reacting quickly and turning the front wheel towards the center line of the bike, like you wanted to run off into the woods. This will momentarinly tip the bike over enough that you can lean into the curve and the bike will follow through.
I've never had bikes with very large trail numbers myself, but at a time, early in my riding career, when I was used to my Kawazaki ZX7r which had very short suspension travel I borrowed a Kawasaki Zephyr with very soft, long stroke forks. When I took the offramp near home at the same speed and lean angle that I was used to, I nearly fell into the turn. The trail is about the same 99 vs 102mm, but the suspension reacts diffently.
My belief is therefore that many accidents linked to forkswaps are as much about riders doing what they're used to with a bike that handles totally different instead of taking the time to learn the bike as if it was a totally different bike.
I'll go ahead with the swap, knowing that I'll end up with 1-2 cm more trail. I'll go easy with the riding until I know how it handles, and if I'm not comfortable with it, I'll make the ride hight taller at the rear. If that's not enough I'll make or buy triples with more offset. I don't think the bike will be dangerous or unpredictable, I just think it will have a lower tolerance for high speed in sharp corners and that has to be taken into consideration when riding
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