racer Posted May 23, 2008 Report Share Posted May 23, 2008 I like to think of scenarios at extremes. So, What about negative trail? I mean ALOT lets say 50-70 mm behind the steering head. I'm not sure I am clear about what you mean here. Do you mean the contact patch is behind the steering head itself or a line drawn through the steering head... ? That is what I call "normal" trail. "Negative" trail to me would be having the contac patch lead the steering axis. To my understanding, "normal" trail puts the contact patch behind the point where an imaginary line extended from the steering axis meets the ground meaning the wheel will tend to self-correct into line with the direction of motion. Even when leaned over, there is a point or angle where the wheel will naturally balance or trail to. And I am proposing that, due to the compression of the suspension altering the rake/trail, the balance point or angle will be affected by more cornering force compressing the suspension. And, the more trail, the longer the lever that force has to act on. Actually, even if the suspension doesn't compress more, like with a bicycle, I think more downward force may still force the wheel to turn more outward. I tested this idea on my associate's pro level racing mountain bike with disc brakes in the parking lot after work today and promptly crashed his bike... hard. He was not happy as he is training for the 24 hour endurance race at Big Bear next week and I tweeked the front wheel a bit...andy way...The left handle bar dug into my gut so hard that it tore a hole in my abdomen that is bleeding as I type this. No... really. I wish I had a video. I've never ridden a bicycle with disc brakes until today. I didn't stop to think that this guy routinely runs down mountains at like 60-70 mph or so and that his brakes might be different than mine. Me... I barely break 40 mph on my way to work everyday on my old road race bicycle... so there I was playing games trying to make the bike "run wide": around th parking lot and I barely touched the front brake, like a whisper of a hint of adding a microgram of pressure... like I laid my finger on the lever and the front wheel locked so hard I was over the handle bars and tangled up so fast my head spinning and I couldn't get untangled... not a dignified position for a man in his mid-forties. Anway... I just want you to understand my level of dedication to, er... stuff like this and to know just how much I have already sacrificed in pursuit of "the answer"... lol Quote Link to comment Share on other sites More sharing options...
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