My Speedometer is off.....
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,101
Likes: 7,629
From: Poolville
I have a 1977 FXE with a 21" front wheel that has a speedo (2260 after market speedo) that was at least 12 mph off at 60 mph. I found a replacement drive unit for an early 80's FXR part number 67127-84A and it is very close to being right on.... although the drive unit is has a narrower spacer I was able to properly space it out with a 1/4" spacer from Drag specialties... Very happy with the results. I paid $25.00 for it on Ebay...
Tourer
Joined: Dec 2014
Posts: 268
Likes: 69
From: Edgerton Wisconsin
I replaced the 16 on the front of my heritage with a 21 and i was able to page through a jp catalog and find a speedo drive off a bike witn a factory 21 like an fxst or something. You might have to add a spacer or something but its a pretty cheap fix.
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,590
Likes: 3,362
From: Cental, MI
If ya measure the "roll-out" the tire diameter has little influence..
just that not all Speedometer drives [especially Chiwanese ones] are created equally!!
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
The front wheels that Harley has used over the years in the Touring models, 16", 17", 18" and 19" all have similar rolling diameters of a little over 25". The 21" is a little larger at just over 26".
No speedo is dead accurate, especially cable-driven ones, and not least due to tyre wear. Especially when driving abroad Mrs B and I use a separate gps to provide accurate speed, to help us while travelling amongst metric speed limits. A gps will provide the most accurate speed readings that are easily accessible to us.
No speedo is dead accurate, especially cable-driven ones, and not least due to tyre wear. Especially when driving abroad Mrs B and I use a separate gps to provide accurate speed, to help us while travelling amongst metric speed limits. A gps will provide the most accurate speed readings that are easily accessible to us.
Intermediate
Joined: Feb 2018
Posts: 46
Likes: 7
From: California
The MPH will very, and will change over time due to wear. The ratio of the drive I checked my speedos with the odometer and mile markers. The odemeter is gear driven and either rolls or is broken. Just a way to verify drive ratios---------RJ
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,101
Likes: 7,629
From: Poolville
Now that I recall thank's to you, is NY State has a lot of county mile marker's on the of state and country roads and are spaced every 1 tenth of a mile. On a 10 mile run my odometer was less than 2 tenths of a mile off. Good enough for me...
Thread Starter
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Tourer
Joined: Feb 2015
Posts: 370
Likes: 16
From: Kansas
Thanks for all the info. Looked at different options but think I'll just look for one set up for a 21 wheel. Seam to be the least expensive. All new gauges sounds like a cool project but not this close to riding season.
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,101
Likes: 7,629
From: Poolville
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