Bike Quiz.

[aardvark]

smitty..sorry mate...but i gotta say this...

BULLSHIT.....

Well, actually, I think you are both wrong, and both right. Is that possible?

When you open the throttle, the back end of the bike rises. If the arse end is lifting, then ground clearance will increase.

However, rolling on the throttle does not make the bike stand up as per Neka's belief. The reason the bike stands up out of corners is because of an input you have made on the bars.

[Smitty]

..snip..
However, rolling on the throttle does not make the bike stand up as per Neka's belief. The reason the bike stands up out of corners is because of an input you have made on the bars.

Jase
that was the point I was trying to make when i said
"Try it on a lefthander and your automatic
reaction will be to load the bar..to keep the bike on track! "

The rider will control the bike and so there will be no change
in attitude
mind you...do the opposite and brake hard when cranked over
and the bike will do one of 2 things...lowside or stand up
and that will be despite the riders input (the exception
of course being the weird german machinery with Paralever
and similar front ends )

cheers

[mobile]

Smitty, I took that question to mean, from the riders perspective and from that you as the rider would increase as the centripital (I hope thats right) force is wanting to stand the bike up so the more throttle you roll on the more force and the more the bike and rider is going to want to stand up.

Someone correct me if I am wrong

[Deserteagle]

12/15. Watching Faster helped

[HemiDuty]

Smitty, I took that question to mean, from the riders perspective and from that you as the rider would increase as the centripital (I hope thats right) force is wanting to stand the bike up so the more throttle you roll on the more force and the more the bike and rider is going to want to stand up.

Someone correct me if I am wrong

Will do. What is actually being referred to is anti-squat. When you get on the gas, whether in a corner or up against a wall (try it!), the wheelbase of the bike will shorten as the rear tyre tries to move forward. As long as your swingarm pivot is higher than the centreline between the axles (any decent sportsbike), the bike will rise up as the force of the rear wheel pushes the swingarm pivot higher.

Make sense?

[Gosling1]

.....When you open the throttle, the back end of the bike rises. ..

true, but only because you are riding a BMW with shaft drive. Its the action of the shaft drive/diff that causes the increase in ground clearance when you accelerate.

This action does not occur on a chain drive bike to anywhere near the same extent - there is a *very* small reaction to opening the throttle on a chain-drive bike, it is a direct result of crank rotation. Basically, if you are cranked over and get on the gas, its only handlebar input that will increase ground clearance.

[aardvark]

Gos,

As per Hemi's answer. If you get on a bike with a chain drive, put the front wheel against a wall and let the clutch out, the same thing will happen. The back end rises.

I'd suggest that most riders believe getting on the gas stands the bike up as per Nekas belief.

[Neka79]

Gos,

As per Hemi's answer. If you get on a bike with a chain drive, put the front wheel against a wall and let the clutch out, the same thing will happen. The back end rises.

I'd suggest that most riders believe getting on the gas stands the bike up as per Nekas belief.

belief? bloody belief??

this isnt religion we r talking abt, or Goslings wavering sexual preferences.....its bloody fact...when u make the bike go "vroom" it stands up....

[HemiDuty]

Yeah but that is not what they are talking about in the question young Neka. Hence why the question asks about ground clearance, not lean angle. Sometimes when you go vroom, it the lean angle gets lower, real quick!

Ground clearance refers to the 'ride height' of the bike, not how far it is leaned. Two different concepts.

[aardvark]

its bloody fact...when u make the bike go "vroom" it stands up....

Of course it does. Because you push the bars in that direction. Try maintaining lean angle and accelerating. I think you'll be suprised at the results.

[Nanna10r]

Sniff, I'm so Proud Seems like only yesterday i was showing "Strawbs" where the Fuel tap on the "timetravel" Zephyr was now he's backing up THE Jas on advanced metaphysics of Scooterage.

Sniff ... they grow up Too quickly.


Ok now i have a drama with the lane positioning for cornering question. Because, while being technically the correct position for the Racetrack it's not where you want newbies to turning across the crap inbetween the wheeltracks in THE real world.
VERY Irresponsible MR Dunlop.

Nanarin' over, oh i got 13/15 who would make a 500cc 4 stroke to compete against 2 strokes the same size. FFS.
cheers Brett

[chameleon]

When you get on the gas, whether in a corner or up against a wall (try it!), the wheelbase of the bike will shorten as the rear tyre tries to move forward. As long as your swingarm pivot is higher than the centreline between the axles (any decent sportsbike), the bike will rise up as the force of the rear wheel pushes the swingarm pivot higher.

Make sense?

Ok, I can see this but what is the nett effect? theoretically with a shorter wheelbase and the nose lowered the bike should "turn in" to the corner more, correct?

[Duane]

I got 1/15 and the 1 was for clicking start quiz

[balanse]

13/15 too for me...

HemiDuty wrote:
When you get on the gas, whether in a corner or up against a wall (try it!), the wheelbase of the bike will shorten as the rear tyre tries to move forward. As long as your swingarm pivot is higher than the centreline between the axles (any decent sportsbike), the bike will rise up as the force of the rear wheel pushes the swingarm pivot higher.

Make sense?

Perfect sense hemi and quite right too.

[Barrabob]

Have to agree with ponti the right line for the road is the wrong line for the track, up in the twisties you have to stay off any line thats being used by cars coming the other way and out of the gravel washes as much as possible.

And trackday dudes had to coach me to do otherwise at the track.