Rake adjustment

[ChipBeck_imp]

I think Jim hit it right on the nose.

Trail is only affected by head tube angle and tire contact point. The only way trail would change from sliding the forks is from the change in center of gravity rotating the frame. I'm not sure how much this will change the trail, anyone tried it yet, notice any difference?

Waffa,

Sliding the fork tubes up in the triple clamp decreases trail and rake. That is a fact, not an opinion. The reason some people get confused about this is because they are considering rake in relation to the bike and it is not measured that way. Rake angle and trail are measured in relation to the ground on a flat level surface, not in relation to the bike. If you slid the forks far enough up in the triple clamp (assuming the frame or pipes didn't hit the ground first) rake would go to zero degrees and trail would decrease to zero and then go negative.

Then imagine going the other way with 5 foot long fork tubes. As you raised the triple clamps up on these tubes the rake angle would increase because it's measured in relation to the ground. And trail would increase tremendously.

Under normal braking as the fork tubes compress and forward weight shift unloads and raises the rear suspension the steering head angle in relation to the ground decreases and trail is momentarily decreased as well until the bike returned to its nutral state. Hope this helps.

Chip