speedo calibration

[dandit]

right I have asked a copper and answer was don't know can't help you ( lot of bloody use he was) and I've asked an mot tester but got same reply so does anyone know where the hell I can get my speedo calibrated as I'm sure it's not reading right. Not that I'm that botherd or anything but it would be nice to know. Cheers for your help if I get any
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WHAT DO YOU MEAN 100 MPH THATS IMPOSSIBLE I STILL HAD 3 GEARS TO GO OFFICER. Currently riding a naked cbr 600 and driving a 52 plate 2litre tdci mondeo

[Kickstart]

Hi

Some bike shops do have the equipment, but not many. Local dealers to me have (Chells), but only seen them use it once, and it might only be for speedos driven from the gearbox.

All the best

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

[McJamweasel]

So that means they can sort mine out to stop it over reading cos of the gearing?
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BCF: Be yourself, just don't be an arse.

[Kickstart]

Hi

Probably not, just tell you how inaccurate yours it!

All the best

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

[Smoto Bob]

Cant you just ride along side a car ( not a modified nova ) and test it using hand signals??

If your realy bored, get a gps, and find a straight road. But you will have to have a constant speed for like 1 mile
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F'it DO WHAT EVER MAKES YOU HAPPY!!!!! Even if it screws over everyone else :p
Titz wrote: "..and my 3rd accident was when this police car....."

[Kickstart]

[mr.z]

Digital speedos for push bikes work very well apparently, far more accurate, you can get gps for £50 and a good one for £150ish (both e-bay) but to get a proper mounting for it add another £20-50

Its quite suppriseing to see how inacurate speedos are, indicated 70 is more like 64 on the cx... so when i'm on longer journeys i tend to rely on the gps for the speedo.

If you think about it this is a good performance mod more speed for free!
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>RidingSkills<->Tech Tips<->MyBikes<

[Bendy]

Find speed trap.

Ride through at constant speed.

Work out speed error from the speed indicated on the ticket you get sent.


Or, more sensibly, try this:

[Kickstart]

[Mr C]

[Slavo]

[cagiva gezzer]

Put your bike on a dyno.
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"because one stroke isnt enough and four strokes waste two"

[T.C]

Find out where your measured mile is and do a check against a stop watch the same as the Police check their calibration.

1 mile at 60 MPH should take exactly 1 minute and 1 mile at 30 will take two minutes, and if the speedo is accurate at these two speeds then it will generally be accurate across the speed range.

If you contact the Local Police traffic garage and ask them or the local authority they will happily tell you. You will see that they are little discs at the side of the carriageway (usually a dual) coloured in red and yellow with segments showing quarter, half, three quarter and full mile segments.

In Reading there are two measured miles, the main one is the A33 southbound Swallowfield Bypass just south of the cafe (and the same measured mile is in place on the north bound, and there is also a measured mile on the westbound M4 between junctions 11 and 12.

The actual distance is checked each year, and as I say these are the same measured miles that the Police use every Sunday to check the calibration of their speedo's.

If you are within a second or so, then your speedo is accurate enough as to make no odds.
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It is better to arrive 30 seconds late in this world, than 30 years early in the next

[MarJay]

The trouble with using a GPS is...
GPS's don't measure your ground speed. They measure your speed in relation to the ground at sea level. This means that when you ride up and down a hill your GPS will give an innacurate reading due to it only measuring your position in two dimensions instead of three.

Do what TC said!
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[carvell]

Indeed @ Mark.

I'm off to visit a measured mile round here this afternoon then!
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Yamaha TDM 850

[Smoto Bob]

[Mr C]

[JeffT]

OK can anyone explain/help with this one.

I have a CG125

Went for a ride with my old man (he was on his almost new blackbird)

When we got to where we were going he commented that I was a bit quick through the 40's and 50's

I didn't believe him as I was sat bang on 30, 40, 50 and 60 according to my speedo.

On the way back we did a little test and discovered that at:-

30 i was actually doing 30
40 i was actually doing 43/4
50 i was actually doing 54/5
60 i was actually doing 65

Now I am glad I discovered this cos I could have failed my test in spectacular style when I do it on my CG.

Can this be sorted or do I need to mark the speedo with the true speed locations?

[Mr C]

and exactly how do you know that the Blackbird speedo is accurate
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187.3bhp = 201mph

[JeffT]

It is used for police purposes

[Mr C]

aha, ok then
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187.3bhp = 201mph

[Rossco]

Was it a beat cop, or a traffic cop you asked?

I would ask a Traffic cop, as they have specific places they take their cars to check the speedo. Surely one of them will be able to assist you.

[mazza]

[Milo]

Not that it's tested in an MOT...but having an overreading speedo is an offence isn't it?
But hey, my speedo only works half the time anyway...
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Shaft drives rule.

[dandit]

any more comments
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WHAT DO YOU MEAN 100 MPH THATS IMPOSSIBLE I STILL HAD 3 GEARS TO GO OFFICER. Currently riding a naked cbr 600 and driving a 52 plate 2litre tdci mondeo