Modifications for 2009 Rebel - Page 2 - Honda Rebel Forum
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post #11 of 19 Old 12-08-2019, 11:20 PM
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Originally Posted by VAReb View Post
Did you possibly mean the opposite?
No. The Rebel speedometer is notoriously overly optimistic about speed. When it indicates say 65 mph, actual speed is several mph slower. Had a 2004 Tundra with oversize tires and it was spot on at 70 mph as verified by several roadside radar displays. Current 2006 Tundra, with standard size tires, is about two-three mph slower at the same indicated speed.

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post #12 of 19 Old 12-09-2019, 07:29 AM
 
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Originally Posted by flitecontrol View Post
No. The Rebel speedometer is notoriously overly optimistic about speed. When it indicates say 65 mph, actual speed is several mph slower. Had a 2004 Tundra with oversize tires and it was spot on at 70 mph as verified by several roadside radar displays. Current 2006 Tundra, with standard size tires, is about two-three mph slower at the same indicated speed.

That’s what I figured you were trying to say. But what you wrote seemed to say the opposite, i.e. your indicated speed (on the speedometer) was less than actual. (Although with the double negative in the bolded statement below it’s a little unclear to me.)

We have many permanent radar speed monitors in our community, which display vehicle speed as you pass. So far on my bike at speeds up to about 40 mph the Rebel speedo and the radar are in exact agreement.


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Originally Posted by flitecontrol View Post
I don't have a bike that indicated speed isn't lower than actual speed when fitted with the recommended size tires. Pretty much the same for every cage I've had...

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post #13 of 19 Old 12-09-2019, 09:21 AM
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Thanks for the tips. Why would the odometer not read correctly? does it have to do with wheel size?.
It may read correctly but chances are it wouldn't. An odometer that runs off the front hub through a cable needs to be matched to the wheel size - you are correct. The circumference of the tire translates directly to hub speed - so a difference of 1" in the wheel size is 5% in speed with rims in the 19" range. As Flite says, the odometers don't run accurate anyways so maybe it doesn't matter. Just something to be aware of and calibrate in your mind if you go that route.

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post #14 of 19 Old 12-09-2019, 12:11 PM Thread Starter
 
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Flasher relay left side behind helmet lock.. 1 flasher relay operates all signal lamps.
Thanks!
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post #15 of 19 Old 12-10-2019, 02:43 PM
 
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Originally Posted by flitecontrol View Post
I don't have a bike that indicated speed isn't lower than actual speed when fitted with the recommended size tires. Pretty much the same for every cage I've had. I guess manufacturers don't want their customers complaining about getting speeding tickets when going the speed the speedo indicates. Not sure if the odometer is off or not. On my VN750, going with a larger diameter tire corrected the speedo, but then the odometer was off (high) just a bit.
This is because your speedo is reading off of a little mechanical spinning gear attached to your front wheel, it's never gonna be that accurate really.. it just reads off of the RPM of the front wheel and translates to kmph/mph

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post #16 of 19 Old 12-10-2019, 02:50 PM
 
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Indeed it is my first real street motobike. I have owned mopeds and dirtbikes while I lived in italy, but never really did any work on them. I am in the process of getting my hands on a pipe and trying that out actually. The left side bent up and out, so ill try seeing how well i can fix it.

For the mirrors I will be doing just that later this week. I will remove them and work at the rust and see how well i can do. The previous owner did scratch the right one pretty badly so ill see how they end up.
Ah right I see. Good luck! Might actually be a replacement required then, chrome never comes back from deep scratches

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post #17 of 19 Old 12-10-2019, 06:36 PM
 
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The four percent rule

For ordinary passenger vehicles, thereís no law in the U.S. that regulates speedometers, but U.S. manufacturers (and most Japanese as well) subscribe to a standard called SAE J1226. Your speedometer reading must be within a range of plus or minus four percent off, but thatís four percent over the entire range of the speedometer, and that range can then be shifted in whatís called a bias.
Look at the above chart based on a Scionís technical guide. At low speeds youíre potentially going faster than the speedometer says, but at 100 mph youíre going at least three miles per hour slower.




From here
https://www.thrillist.com/cars/your-...-japanese-cars




This is a good read also
https://www.caranddriver.com/feature...meter-scandal/
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post #18 of 19 Old 12-10-2019, 06:56 PM Thread Starter
 
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Originally Posted by SoakedKarma View Post
Flasher relay left side behind helmet lock.. 1 flasher relay operates all signal lamps.
Thanks
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post #19 of 19 Old 12-10-2019, 06:58 PM Thread Starter
 
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Originally Posted by deere245 View Post
The four percent rule

For ordinary passenger vehicles, thereís no law in the U.S. that regulates speedometers, but U.S. manufacturers (and most Japanese as well) subscribe to a standard called SAE J1226. Your speedometer reading must be within a range of plus or minus four percent off, but thatís four percent over the entire range of the speedometer, and that range can then be shifted in whatís called a bias.
Look at the above chart based on a Scionís technical guide. At low speeds youíre potentially going faster than the speedometer says, but at 100 mph youíre going at least three miles per hour slower.




From here
https://www.thrillist.com/cars/your-...-japanese-cars




This is a good read also
https://www.caranddriver.com/feature...meter-scandal/
Thanks! this was a very interesting read, never new that!
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