Im interested, what's easier to loop up or down the hill? I had an argue with a friend of mine who said it's easier to loop up the hill cuz it's easier to lift it up. To me it doesn't make sense, and what I felt few times riding up and down (don't like it much, im scared of it), I think it's easier to **** it up goin down? can anyone inform me...

 

im pretty positive, by theory alone, going uphil would be more dangerous.. u have to look @ a side angle of a bike up a hill... here do this..

draw a line straight up touching a flat line.. representing a bike @ 12 oclock

no draw one straight up on a down slope and up slope.. now picture gravity coming straight down.. i think u will realize if u do this.. if your going down hill, gravity will be pushing your bike foward more, making it harder for you to push the bike backwards, and your tail would probably hit eariler going down hill.. as for up hill, the bike would get lighter quicker and it would hit its "12 oclock position quicker" therefore pushing u backwards after that point, and your tail would still be further from the ground..

all depends on how hard a slope we are talking bout too.. i mean a slight incline wouldnt make it to crazy, but picture like a 45 degree or higher hill, you'd probably have to be @ like 1 oclock to scrape.

thats just what i think, it might not be 100% correct. or correct at all

Mark

 

he pretty much hit it on the spot,think about it,if it lifts easier and faster than your used to on an even stretch of road theres more chance of fliping..just my

 

It Is Much Harder To Wheelie Down A Steep Hill And Definately Way Harder To Loop It Downhill.

 

Down hill is easier to loop.

Going up hill the engine brake is far more powerfull since you have gravity.

 

i agree...balance point going is higher if you're going uphill, and not as high if you're goin' downhill due to gravity. alot more dangerous going downhill because you'll think you aren't at balance point when really you went past it already. better have that rear brake covered since engine brakes aren't gonna do shiat. let off the gas goin' downhill and your momentum is gonna make you loop. better cover that rear brake.

 

Back in the day thats how i learned to wheelie goin uphill it was alot easier to balance out. Id have to agree that going down is easier to loop because to hit Bp you have to bring it back far Depending on the grade if i wheelie downhill im on the brake alot of times.

 

That is completely backwards. MOmentum going downhill will make the bike want to drop, not loop. The center of gravity does not change going up or downhill the hill just slows the speed and you can ride lower without gaining speed going up hill. GOing down inertia wants to keep you moving downhill and you have to either wheelie past the balance point or you will continue to pick up speed. APply the brake and it will make the front end drop, that's why it is harder to wheelie downhill and not gain speed. BTW there is no such thing as an "engine brake" Engine braking is just a term for the deceleration of the reciprocating and rotating mass of the engine wanting to slow the rear wheel down.

 

Here's the straight deal folks:

BP is lower going uphill and higher going downhill.

Going uphill you can ride below what would normally be the BP heighth because you can use some torque to the rear tire to hold the front up and the torque will be used climbing the hill instead of accelerating as it would on flat road. If you rode a wheelie as high as a normal BP wheelie you would slow and stop because at BP on a flat road you're not putting any power or braking to the rear wheel just holding steady.

Riding a wheelie downhill is exactly the opposite. To BP downhill you actually have to ride behind what would normally be BP because you have to use a certain amount of brake (either engine compression, or rear brake) to keep from speeding up due to gravity and the fact that you're riding downhill. In this instance if you were at the normal BP heighth you would be riding along not putting any power or braking to the rear tire and gravity would speed the bike up.

I've never looped either so I can't comment on that one. I know I feel a lot more comfortable trying BP wheelies uphill because they're not nearly as high.

 

Neither. Just use your rear brake and there won't be any looping

 

seems backwards due to, as you said, inertia. i understand why you say the center of gravity doesn't change, because....well, it doesn't. building onto what reversal said a couple posts ago, picture a straight line (road) and the angle of your BP on that straight road. if you tilt the whole picture depicting an uphill wheelie, you'll notice the angle of your BP to the road remains the same, but the angle is greater in comparison to the angle on the straight road. vice versa for downhill. also...we call the deceleration of the reciprocating and rotating mass of an engine........
survey says....

engine braking

 

deceleration of the reciprocating and rotating mass of an engine........ ... sorry, i can barely even read that yet alone remember it and use it instead of engine braking ... anyways yes, draw it out on paper.. but dont rotate the paper, just draw three pictures and analyze it


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something like that

and picture the bike (the straight up line) traveling to the left.

if u look @ the middle one (going up hill) your front tire wouldnt be much off the ground and u are @ 12 oclock

where as the down hill, you would be xtremely far off the ground and @ 12 oclock.. and probably going bout 40 mph faster down that steep of a hill

Mark

 

Read my post again. It's fact and it aint gonna change. If your definition of a BP wheelie is one in which the bike continues at a constant speed then the front will be lower going uphill and higher going downhill.

If your definition of BP is where your CG is directly over the center of your rear axle then that won't change but you will slow and (eventually) stop going uphill and you will gain speed going downhill.

To keep at a constant speed the CG has to be moved forward going uphill to allow you to apply more throttle to keep your speed steady going up the hill.

To keep a steady speed going downhill the bike's CG has to be moved behind the rear axle to offset the braking that must be done (either engine or rear brake) to keep from gaining speed.

 

rrmike comment is correct.

but it's also easier to learn wheelies at uphill. The uphill keeps the speed lower even when not in BP and gives more time to learn. And because you see the ground raising front of you it doesn't feel so high and is less intimidating.

downhill is just sick if you are still learning the bike gets lot of speed and fast, also at downhill it looks like your front is way higher then it really is (compared to gravity direction).

JakeT