hello my question is not related to the fzr motorcycles or something in mehcanic parts i just wonder nd hope some1 brong for me the answer coz iam thinking alot abut it i watch alot of video clips abut wheelie like hayabusa or R1 they show u the speedometer like its at 150km/h how is that sice the speedometer measures the speed by measure the rotation of thje front wheel nd while doing a wheelie the front wheel is in the air not on the ground so its not rotating on the ground maybe it may rotate at little bit from the air pressure but not witht he same speed of the moto sped realtive to the ground so how the speedometer give ur the speed?? i hope u got what i meant iam a physics student thats y iam thinking alot abut this idea hope ill fine the solution for it or maybe they are fake clips?
hahahahahaha <!-- s:roll: --><img src="{SMILIES_PATH}/icon_roll.gif" alt=":roll:" title="Rolling LoL" /><!-- s:roll: --> that is brilliant ive never thaught of thatuntil now that cracked me up after having a think about it id assume that the speedo cable is connected to the gearbox on newer bikes
im guessing english was not part of the physics course. lol im sure as has been suggested that the speed is derived from the gearing and revs measured from ignition coils or something like that, thats why when you change sprocket sizes and thus effecting gearing the speedo will be off.
A lot of bikes use a sensor in the gearbox on the output shaft to measure speed from the back wheel if that helps... changing sprocket sizes or tyre profile will affect the reading.
hahah first id like to say for _m_ that english is my third langauge i hope u got what i mean so dont b scared from my language if its terrible but at least its the thrid langauge i know <!-- s:lol: --><img src="{SMILIES_PATH}/icon_lol.gif" alt=":lol:" title="Laughing" /><!-- s:lol: --> ...... if the speedometer is getting the speed from the gearbox the gearbox i think each gear in it gives a different speed at an rev or in the gearbox there is a an axe that its the final resultant from the gears motion? i dont know alot of parts names in english :S:S but i just need some1 to explain more 4 me abut this idea i got it a little bit from it but iam thinking that each gear revolution gives a different speed to the motorcycle or inside the gearbox there is something else other than the gears that is related propotional to the speed of the wheels
does that meen on a newer bike if your doing 160 down the high way and you pull the clutch in on put it into (N) that your speedo will read 0ks an hour it cant can it maybe they just read off the back wheel
i'd imagine similer to a car speedo drive if you can it reads off the final shaft that spins the tailshaft (in a bikes case the shaft that spins the front sprocket) so it doesnt matter what gear its in it is always spining in a relative manner to the tyre not the engine or any specific gear in the gear box which is why they call it final drive
ok thats it its too near to the cars system i rember i had a nissan car not new on model it accelarates from the back wheels not from the front as most of new cars when i used to kick nd accelrate fastly causing the rear wheels too slide especially when the road is wet i recognaized that the speedometer will rise nd rise reaching the 120km/h while the car surely is not at this speed but the wheeles pushing the car are sliding and the car is moving slow anyway surely its not on the rear wheels if they wana choose the speedometer to take the speed from wheels surely they will choose the front wheels not the rear coz the front wheels are more near alot to the speedometer why they have to make wires with longer distance do its related to the gear box of the final final spin not with the gears inside hope u got something from my weak langauge <!-- s --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt="" title="Very Happy" /><!-- s -->
Quite right, one shaft in the bike gearbox is always proportional to the rear wheel speed and the other proportional to the engine speed (when clutch is engaged)
ok man i got the way it works <!-- s --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt="" title="Very Happy" /><!-- s --> trying to be more silly abut the topic it has a weak point means if i took pff the motorcycle chain the one which is between the gear spin and the rear wheel if i took it off nd turn on the bike nd try to accclearate the speedometer will reads nd the bike is still in its place not moving u can make 300kms/h nd ur smoking a ciggarate <!-- s --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt="" title="Very Happy" /><!-- s --> hehe anyway thanks guys and bye bye
The bikes front wheel has to be turning in order for the bike to have stability during the wheelie, so if the started the wheelie at that speed than the speedo would read that if it is read of the front wheel. otherwise it is prob a sensor of the gearbox, but the front wheel will be still turning. something to do with needing the gyro effect of the front wheel for control.
I'm sorry but that is a false staement. There is a stunt rider out there that rides a Duc Monster 900 (I think) that has no front wheel and no front forks. The guy rides the crap out of it. I used ot have a video of it, but cannot seem to locate it. I'll have a look when I get home later tonight.
im going with fzrdude on this one the gyro for the back wheele would be enuf but to ride a bike with no front wheele that outrages how did he take off?
Well, I learn something new each day.. would love to see the video, and I'm with david, how would he take off?
ive seen this guy! It's way cool. he starts with the forks on the ground, then just pops the bike up and rides off. I wish I had that much control, but I dont want to screw up a perfectly good bike to learn how to do it.....I also have a day job and don't want to screw up a perfectly good body!
If its the guy i think your all referring to it's Christian Pfeiffer. He USED to ride a Ducati Monster as his stunt machine but has since swapped to one of the new BMW belt-drive 800's. The stunt your referring to is the mono-cycle, and yeah it's just a rear wheel, chassis and the head stem with no forks or front wheel. The footage i've got of him doing that is from the Streetfighter & Stunt day in 2004. I think the clip was distributed by someone called Einfetza... or similar.
