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Do you have spec numbers to back up your statement?
Nope, and don't need them. I ran the numbers for my own situation and was well within the acceptable range.
Figure out your own situation and run them yourself. There is a great deal of information and R&T calculators out there. Do a google search for rake and trail calculator.
Go to RB Racing's rake and trail calculator. You'll see that lowering the front end 1" actually/only increases the trail .1". This must be due to the negative offset trees the touring bikes use.
TRAIL: The distance defined by the vertical line from axle to ground and the intersection of centerline of the steering neck and ground.
Is this how I read the trail measurements?
based on the diagram on the web, the trail has no effect when lowering just the front end?
The bikes rear end measurements are not even included on the Trails calculation. So why it is a must to lower bikes rear end when lowering front end? I dont need to do I? And bike is safe riding it that way.
By the way Thank you for this website.
TRAIL: The distance defined by the vertical line from axle to ground and the intersection of centerline of the steering neck and ground.
Is this how I read the trail measurements?
based on the diagram on the web, the trail has no effect when lowering just the front end?
The bikes rear end measurements are not even included on the Trails calculation. So why it is a must to lower bikes rear end when lowering front end? I dont need to do I? And bike is safe riding it that way.
By the way Thank you for this website.
That is correct, you shouldn't see any noticeable increase or decrease in handling with such small changes.
I lowered my 2011 flhrc's front end 1.5" and it handled WAY better. much more responsive and controllable. No trail issues at high speed or fast acceleration.
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