186mph Restrictors

[Az]

I've recently been told that all bikes in the UK that are capable of more than 186mph, are restricted to 186mph.

Why 186mph? Crashing at 200mph+ or 186mph is going to be deadly regardless.

[lihp]

iirc it's an agreement between manufacturers to stop them competing over speed and it getting out of control.

It's a 300kph agreement, which works out around 186mph

[.Bishbash.]

Yup, exactly as Phil says, I think no bike can hit 300km/h standard that is. Fiddle with the bike and the story will be different.
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Current bike - GSX-R1000 k8

[Az]

Oh okay, so the 186mph/300kph restriction is not a legal requirement or specific to the UK?

[.Bishbash.]

Nope, it's in Europe and US for sure. It's a manufacturer thing

Take a peek at Ghost riders vids for instance, he never hits 300km/h EVER
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Current bike - GSX-R1000 k8

[UrbanRacer]

[Timmeh]

Much the same thing happened with the Jap 400 supersports in that all they produce pretty much the same power. Out of the factory, anyway.
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GSXR400 x2 | '94 RVF400 | '93 TZR125 4DL (again)
20:22:30 BLUEX5: i would love to be forced to undergo a**l plugging with different sizes
20:48:18 Temeluchus: comp you hunk of smouldering homos3x you

[Wull]

They're easily bypassed anyway.

On my gixer thou there was a restriction in 1st 2nd and 6th gear(186mph) but with the atre fitted it removed all of these allowing me to get over 186 even though the clocks stopped at this point.
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"Scooters are for men who want to ride motorcycles but prefer to feel the wind on their vaginas"

[Kickstart]

Hi

Commonly bypassed with a speedo healer.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Llama-Farmer]

Yup was manufacturers policing themselves with a gentleman's agreement, before the EU stuck their dicks into the business and created a mandatory power limit, or speed limiter.


Rich people with their £100k+ can have their 200mph+ cars... but they don't want people on a £10k bike doing the same speeds.
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Current Bike: 1999 Honda CB600 FX Hornet
Next Bike: I want a CBR-RR. And I want an F800 GS-A. And a VFR 800. Can I have all 3?
Dream Bikes: Honda VFR750R RC30, Honda NSR500, Ducati 996 R

[Dave70]

[Cadbury]

Mirroring what everyone else is saying -started with the Hayabusa surpassing the blackbirds top speed by quite a bit, they came up with a Gentleman's agreement to stop regulations banning high speed motorcycles. Although, according to that list, the MV Agusta F4 R 312 is capable of 194mph, so maybe things are on the change.

[RhynoCZ]

[Llama-Farmer]

[c_dug]

Technically most of the Isle of Man has no speed limit either, and clearly it is possible to hit 200 on a motorcycle there if you are mad enough to try.
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I am a bellend, I am a man of constant sorrow, I am a gummy bear, I am a rock.

[Llama-Farmer]

[Pete.]

Even without the rev limiter few bikes have the power to pull 200mph on the flat and level. For those that do, the easiest way to defeat the restriction is change the front sprocket. your clocks won't read any higher but the road speed will be there.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[G]

[daemonoid]

[daemonoid]

[daemonoid]

[Musketeer]

I've done 130-140mph (satnav) on Autobahn on a few ocassions and I must say German people suprisingly behave there because there was not one car that was overtaking me (even Porsches, Ferearis etc.) I felt a bit like a knob haha.

Going anything above 150mph on Autobahn for a long period of time is a madness especially on a bike... too many grannies in their Puntos and Ticos driving erratically. On 4 wheels slamming your brakes or even hitting something have less severe consequences.

I've seen a result of crash on Autobahn.. I'm not sure what happened, only one car involved - either driver fell asleep, or lost control, burst tyre etc. The pieces of the car could be found all over the road oa a one mile stretch

I experienced emergency braking from 140 to 0 too... Almost shat myself.
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Current Bike: Yamaha XSR900 Previous bikes: Honda CBR1000RR Fireblade, Kawasaki ZX-6R Ninja, Aprilia RS125 2-stroke

[Dibble]

One of the reasons is Tyres, legally your tyres have to be rated to the maximum speed of the vehicle.

If you look at the tyres for the first unrestricted Hyabusa the cost far more than those rated for up to 186mph.

Tyre manufacturers (I used to work for one) are nervous about high speed failures and also frequently moan about having to go to the trouble of producing a fuel efficient, grippy, long life, attractive tyre that also is rated to high speeds and works in the wet when the speed limit is 70mph...... They don't want loads of bikers doing 200mph. "The Tyre Designers Challenge"

I personally wouldn't be worried about doing 187mph on a tyre rated to 186 as the rating covers running at maximum weight in high temperatures for a long while.

[RhynoCZ]

[Polarbear]