South West Bikers | Motorcycle Forum

my flatulence is known to travel at supersonic speed and cause volcanoes to erupt many miles away
lucky i don't get done for doing 100mph along the m5 on a regular basis then

i know the guy in question and when i heard about it i thought yeah no doubt he was doing 150 but you can clearly see that it was not that sort of speed at all!!

People that tuck themselves in just look stupid, hes doing 90ish, not 150.

Funky wrote:I broke the sound barrier on my CBR125

the only thing you broke on that was your thumb

Thats the only thing I did break, the bike was immaculate...


Honest

Funky wrote:Thats the only thing I did break, the bike was immaculate...


Honest

Did the wind break it you pussy?

115mph from a restricted NC30 that's good, my Honda CB500S only does 115mph unrestricted. The policeman will look a numpty if they find the bike is restricted. Strange how the brakes only came on for no more than a second at the end, if he was slowing from 150mph he must have phenomenal engine braking. With fixed speed camera's they measure the distance you travel over the white lines between the 2 photos, and the lane marking lines on the A38 are a fixed distance apart. 100mph is 44.7m/s (meters per second) so if you could be bothered, you could calculate his speed by the number of white dashed lines he passed in a second.

Also as I understand it, the bottom of the tyre is moving forward at the same speed as the bike, while the rear of the tyre is moving upwards and forwards, and the top of the tyre is moving forwards at twice the forward speed of the bike and rider. Thus if the radar was on the top of the tyre when 150mph speed was measured, it would mean that the forward speed of the bike was in fact 75mph

Princess wrote:

Funky wrote:Thats the only thing I did break, the bike was immaculate...


Honest

Did the wind break it you pussy?

No it broke as I took it out your mum's arse. She used to be tight...


That last paragraph is interesting. Is that actually true?

the speed of the surface of the tyre will depend on the radius etc of the tyre

for a given speed, a smaller wheel will obviously be rotating faster than a larger wheel

ok so some guesstimation gone on as I havent a clue about the size of your sports bike tyres

but 17" wheel, plus the tyre, maybe 22" dia, call it 56cm

by my reckoning, they say 150mph, well maybe yes, tyre speed of 150mph at the top, would give a spindle speed, ie along with the rest of the bike of 85.7mph

now factor in the over reading of his speedo

he says he was doing 90, I beleive him

just been and watched that video again, immediately before the reading flashes up the "crosshair" is hovering over the tail light and numberplate

be very interested to know the range that the gun was being used at and also the spec/class of the laser/infra red units

also are they "zeroed" regularly

I bet that the diffusion of them at that range would have easily opened up the scanned area to include the well exposed rear tyre

Agree with all the above, about 90 -100 tops.

Surely it must be possible to work it out some other way????

I know he's been a pratt licence wise but getting done for 150 is serious stuff maybe even pokey time, that can't be right if he was really doing 90ish

tony-klr wrote:the speed of the surface of the tyre will depend on the radius etc of the tyre

for a given speed, a smaller wheel will obviously be rotating faster than a larger wheel

I don't think you're right about that. The rpm of the tyre/wheel will depend on its radius, but the velocity of the outermost edge of the tyre shouldn't be affected by radius only forward speed, so the top of the tyre should be moving forwards at twice the forward speed of the bike regardless of the radius. If being pedantic how much the tyre deforms against the road and tyre slip will have small effects. Good point though about the size of area over which the radar hits the bike, it must get bigger the further the bike goes away from the camera/emitter, and could be overlapping onto the tyre even though the cross hairs are on the rider. I wonder if the Policeman dropped the camera at the end as he knew the rider was out of range, as prescribed by the manufacturer of the handheld radar gun.

A good lawyer should be able to clear him of all charges on this. Probably worth him getting MAG involved as they ran a campaign about not using these guns on bikes.

then he could go down the route of discrimination against bikers in the public sector by 'pillars of the community'


do you notice how on the article there isn't the normal - post your comments box - wonder why that is ????