Question about 2003 CCM 604 RS Roadster

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Spedometer Anyone changed the speedo on their 604 with one off another bike? Mine is reading way out due to different tyre size and i really need a trip meter. Seen a few nice cheap ones on ebay but wondered wether the thread size on drive would fit or dia of body was roughly same.Thought if i get one off bike with same size wheels would be more accurate.I know about the new digital ones but they are out of my price range at the moment?

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Not heard of using one from a different make bike. An option to get you by for now would be a pushbike digital speedo a few on here have used them.,

Posted on Nov 10, 2008

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What diifference will it make to my speedo reading if my front tyre is size 120/60 ZR17 instead of 120/17 ZR17 on m1993 suzuki rf600r bike


If I am reading the tire size right you are dealing with a different width and not circumference. If in fact it is width it want make any difference, however, if it is circumference then if the tire is smaller the transmission is going to have to turn faster to get 50 MPH or any speed. The speed of your car is measured at the back of our transmission. Smaller tires will make the speed-0-meter read fast and larger tires will give you a slow reading. This is the one that will get you in trouble. With a larger tire and you meter reading 50 you might be doing 60 or more. You can figure the speed of any tire on a car just take the circumference of the tire [how many inches it travels in one revolution] and divide it into 5280' for miles then Multiply it by T=time taken to travel distance then figure in the RPM's and drive your self crazy trying to figure it out.
Again as I said if they are the same circumferance then your speed -o- meter will not change.
Col. Dana Gillespie

Jul 05, 2014 | 1993 Suzuki RF 600 R

1 Answer

My speedometer seems to read higher than it should at highway speeds. When traveling at about 40mph its almost dead on with my gps/ other vehicles. When at Highway speeds I can be showing anything from...


unfortunatey you may not be able to fix this, speedos generally run from a sensor or cable at the front axle, and rely on the rotating wheel, and are not generally able to be calibrated.
An instrument tech amy be able to do something if your model?? has an electronic speedo, but the reading can change with different tyre sizes, and even slightly as the tyre wears

Apr 04, 2011 | kawasaki ZX-6R Ninja Motorcycles

1 Answer

The speedo sensor isn't reading the true speed .it reads a lot faster than what bike is going. only had the bike a few days. no idea what to do


The speedo needs callibrating as you have either different sized tyres/wheels or the speedo has been changed.
Take it to a dealer for callibration.

Feb 01, 2011 | 2007 Gas Gas Pampera 450

1 Answer

Hello. My pulsar 150 UG3 is giving me speed of 47kmp at 4000Rpm which is 3kmp slower than normal as i have another same bike which produce 50kmp at 4000. How it can be corrected? I have consulted to...


Speedometers are not exact and they will vary slightly, even between the same model, year etc.
Tyre size and wear also affect the reading because of the distance travelled with one complete revolution of the wheel. A new tyre with plenty of tread depth will travel further in one revolution than an older worn tyre with less tread depth. If you have two bikes and the tyre treads are different depths, just measure around them both and you will see the different circumferences. Multiply that difference by 100 and you see how much further one will travel than the other in only 100 revolutions and when you think how many times a wheel goes round on a journey, the difference is huge. This puts into perspective the 3KPH difference and also why a tyre seems to wear out quicker once it is down to half the original tread depth......I know mine seem to.

Oct 10, 2010 | 2007 Bajaj Pulsar 150

2 Answers

Steering problem GSXR600 SRAD


A couple of things... are the tyres matched? You said you have changed the rear and the front is worn - this will definitely have an effect on handling, as will tyre pressures. The correct sizes for your tyres are: Front 120/70 ZR-17, Rear 180/55 ZR-17
You should ALWAYS use matched tyres - even differences between models in the same brand will be different and you shouldn't mix and match unless you are an expert - and I mean a real expert - pro racer or similar.
Tyre pressures for your bike are : 36psi front and rear. Unless your tyre manufacturer says different, use that figure. Unless all those things are right, you can't begin to diagnose handling issues.
Good luck!

Jun 28, 2009 | 1999 Suzuki GSX-R 600

2 Answers

I own a 1991 gsf400 bandit..I have to replace the stock tires with new ones and have a very good deal on the Michelin Power ct2's..the stock tire size is front-110/70/17...and rear-150/70/17....can i...


I suggest you stick with the stock tire size. If you don't, the speedometer will not read correctly. With a smaller tire if the speedo says 65 you will really be doing 55 or so. The actual mileage driven will be off as well. The lower profile tires also do not cushion the rim as well. The spokes are more likely to get out of whack. It is also harder on the brakes since the brake disk is spinning faster to go the same distance as a stock tire would be turning.

Apr 24, 2009 | 1991 Suzuki GSF 400 Bandit

1 Answer

02 EC250 speedo


I have the same speedo but it built into the headlight on my 97 Siz Days 250. So it is a GasGas part but I do not really know too much about the parts needs to make it work. Although mine was routed to the rear wheel instead of the front so you might want to see if there is a sensor built into your rear hub. You should be able to go with the newer gasgas speedo setup since your on a 02'. Good luck with it.

Nov 10, 2008 | 2001 Gas Gas EC 250

1 Answer

604 hubs& 644


just looking for wheels now. I can turn spacers if need be but if discs/sprockets don't match I'll be stuffed.The hubs and bearing sizes are the same but either could be made by AJP or Talon. Some handy things to know are ; 604 sprocket is no good for a 644 unless a 520 chain has been fitted. You will need to turn the rear tyre round if the wheell was on a 604 and its to go on a 644. Talon hubs use a different speedo drive to the AJP,,,

Nov 10, 2008 | 2001 CCM 604 RS Roadster

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