Is it my imagination or..

BrianW · 04-20-2010, 08:03 PM

is the Zong speedo off? It seems accurate until I get to about 25 mph then it seems like it starts getting off. Then, the faster I go, the more it seems inaccurate. When I feel I am going 55-58 the speedo reads nearly 70!

Is this due to my poor judgement or can anyone vouch for this as well?

MICRider · 04-20-2010, 08:30 PM

Nope, it's not your imagination... Most people report their speedo's being about 10% optimistic. I think that more or less applies to all china bikes, my Konker seems to be going slower than indicated as well though I have never checked it's accuracy.

Weldangrind · 04-20-2010, 08:36 PM

I'm guessing that whichever speedometer they used was designed for a different diameter front wheel.

BTW, bicycle computers are cheap and easy to install. Buy a backlit version (ask me how I know

).

alan566 · 04-20-2010, 08:38 PM

i think the zong spedo is set up for a 21" tire. i guess at 70 on spedo i am running close to 60 cause thats were the traffic is running.

2LZ · 04-20-2010, 08:46 PM

Don't feel bad. I've taken my cable out, lubed it, remounted everything and even with my new gearing, wide open in 5th, tears running back into my ears, tucked under the bars, my poor little Lifanoid only tops out at 32 mph according to my speedo! 8O 8)

FastDoc · 04-20-2010, 09:56 PM

Quote:

Originally Posted by alan566

i think the zong spedo is set up for a 21" tire. i guess at 70 on spedo i am running close to 60 cause thats were the traffic is running.

That was Spud's observation.

SpudRider · 04-20-2010, 11:11 PM

Quote:

Originally Posted by FastDoc

Quote:

Originally Posted by alan566

i think the zong spedo is set up for a 21" tire. i guess at 70 on spedo i am running close to 60 cause thats were the traffic is running.

That was Spud's observation.

You are both correct, gentlemen.

With the stock, 18-inch front wheel, the Zong speedometer is roughly 10 percent "optimistic."

I am now running a 21-inch front wheel on my Zong. Today I checked my speedometer versus the speed displayed on my Garmin GPS receiver; the speeds were the same. I must admit, I don't know how accurately a GPS receiver calculates speed. However, I was going by a highway radar display the other day, and it also indicated the same speed as my speedometer.

My odometer, however, now seems to be 10 percent "pessimistic;" it records 0.9 mile for every mile traveled! I figured the odometer would be accurate if the speedometer were accurate; however, I guess I was wrong. :?

Spud

BamaRat · 04-20-2010, 11:27 PM

Speaking of the odometer, Is it measuring miles or Kilo's

SpudRider · 04-21-2010, 12:47 AM

Quote:

Originally Posted by BamaRat

Speaking of the odometer, Is it measuring miles or Kilo's

The Zongshen odometer records miles, Bama.

P.S. We eagerly await photos of your new Zong.

Spud

TurboT · 04-21-2010, 01:12 AM

Quote:

Originally Posted by SpudRider

Today I checked my speedometer versus the speed displayed on my Garmin GPS receiver; the speeds were the same. I must admit, I don't know how accurately a GPS receiver calculates speed.
Spud

My Garmin GPS has read the speed within 1 km/hr of three of my vehicle speedos I've had since owning the GPS. I'd say it is very accurate or similarly spec'd to the three cars (2006 Pontiac Van, 2005 Dodge Ram Pickup, 2001 LandRover Discovery)

I think you can use it them as a reliable speed reading tool.

04-20-2010, 08:03 PM	#1
BrianW Join Date: Feb 2008 Location: Wheeling, WV native currently living In Natchitoches, LA Posts: 297	Is it my imagination or.. is the Zong speedo off? It seems accurate until I get to about 25 mph then it seems like it starts getting off. Then, the faster I go, the more it seems inaccurate. When I feel I am going 55-58 the speedo reads nearly 70! Is this due to my poor judgement or can anyone vouch for this as well?
	0

04-20-2010, 08:36 PM	#3
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	I'm guessing that whichever speedometer they used was designed for a different diameter front wheel. BTW, bicycle computers are cheap and easy to install. Buy a backlit version (ask me how I know ). __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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04-20-2010, 08:46 PM	#5
2LZ Join Date: Mar 2010 Location: Volcano, Ca Posts: 7,103	Don't feel bad. I've taken my cable out, lubed it, remounted everything and even with my new gearing, wide open in 5th, tears running back into my ears, tucked under the bars, my poor little Lifanoid only tops out at 32 mph according to my speedo! 8O 8) __________________ "Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350
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04-20-2010, 08:30 PM	#2
MICRider Join Date: Oct 2009 Location: Alberta, Canada Posts: 3,274	Nope, it's not your imagination... Most people report their speedo's being about 10% optimistic. I think that more or less applies to all china bikes, my Konker seems to be going slower than indicated as well though I have never checked it's accuracy.
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04-20-2010, 08:38 PM	#4
alan566 Join Date: Feb 2010 Location: Hartwell, GA Posts: 187	i think the zong spedo is set up for a 21" tire. i guess at 70 on spedo i am running close to 60 cause thats were the traffic is running.
	0

04-20-2010, 11:27 PM	#8
BamaRat Join Date: Apr 2010 Posts: 23	Speaking of the odometer, Is it measuring miles or Kilo's
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