speedo accuracy - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Wheels, Suspension and Brakes
Everything to do with wheels, tires,
suspension, forks and brakes

 3Likes
  • 1 Post By michiganteddybear
  • 1 Post By CKGonzo
  • 1 Post By Liquidmetal
 
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 08-07-2017, 08:22 PM Thread Starter
Member
 
boscoe's Avatar
 
Join Date: Jun 2017
Location: SW Missouri
Posts: 75
iTrader: (0)
 
Garage
speedo accuracy

how accurate is the 750 speedo when bike has stock tires? Is it a constant amount or does it vary with speed?

In God we trust. All others pay cash.
boscoe is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 08-07-2017, 09:18 PM
Super Moderator
 
Join Date: Feb 2013
Location: SW Florida
Posts: 2,419
iTrader: (5)
 
It will be off the same percentage of the actual speed at all speeds. Let's say it's off 10%. At 10 mph that's 1 mph error. At 30 it's 3, at 60 it would be 6.

The absolute error number increases with speed, but the percentage is the same
boscoe likes this.

2005 VN750

Sold 11-27-17
michiganteddybear is online now  
post #3 of 5 (permalink) Old 08-07-2017, 11:24 PM
Junior Member
 
CKGonzo's Avatar
 
Join Date: Feb 2017
Location: Longmont, CO
Posts: 26
iTrader: (1)
 
Garage
I concur. Owned two VN750s and the speedometer is off right about 10% to true speed with stock-sized tires.
boscoe likes this.

Current: 2004 VN750
Former: 1989 VN750, 1978 Honda CB250
Back in the saddle again after sacrificing my ride for my kids in 1994!
CKGonzo is offline  
 
post #4 of 5 (permalink) Old 08-08-2017, 05:50 PM
Junior Member
 
Join Date: Jul 2017
Posts: 19
iTrader: (0)
 
My GPS tells me that an indicated 70 mph is actually 64 mph. Stock sized tires.
boscoe likes this.
Liquidmetal is offline  
post #5 of 5 (permalink) Old 02-09-2018, 12:43 AM
Alpha Geek
 
Hexadecimus's Avatar
 
Join Date: Oct 2013
Location: Midwest USA
Posts: 487
iTrader: (1)
 
Yep, 8-10 depending on brand of tires. The same size in one brand will be a slightly different measurement on another. In fact, I "sized up" my rear once to another brand and found it was smaller in rolling diameter. Anyway, I've run a bunch on 5 or 6 vn750s ranging from 86 to 06. Usually closer to 10%, checked by radar, GPS, etc.

If you want to be reeeeeally anal, it'll be slightly less than a linear 10% because as the bike goes faster, the rear tire can stretch vertically from centrifugal force

Hexadecimus is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Once registered, your User Name"cannot be changed". We can make exceptions within 7 days, but after that, it is set in stone.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome