I just replaced my stock front rim & tire with a 21". I have noticed that my speedometer is off. About 5 mph at 45 mph. Is there a fix for this or am I just going to have to live with it?

Thanks Chad

 

Chad, give us a hand! Is this a cable-drive or electronic speedo? It should be possible to get a suitable cable drive unit, I'm not sure about an electronic speedo.

 

 

It is cable driven from the front wheel.

 

You're just gonna have to live with it.
Believe it or not 16", 19", and 21" wheels all have about the same tire height.

FWIW my '95 Heritage is 4 mph off at all speeds.

 

Speedo drive units can have different ratios - usually a bagger has a 2:1 ratio according to the replacement fitment charts. The 2240:60 ratio fitment list softail and dynas models but it would take more research to determine if those models have 21" wheels. The widths also vary. This might be a solution.

I replaced a stock 16" front wheel with a 19" enforcer wheel and that was less than 1/8" taller. I really didn't notice the change for my odometer.

Updated: Based on the Drag Specialties Fitment charts on the Dennis Kirk site, what I saw was the 2240:60 ratio was for models with 21" wheels.

 

My FXSTC has a 21" front wheel.

 

Thanks for the responses. Wasn't sure if there was a fix or not. Don't mind living with it the way it is.

 

speedhut.com 4 1/2 inch GPS speedo. I recently did mine and absolutely love it,it has the tach as well. gives a lot of info 0-60... 1/4 mile.... altitudes... direction....and even has a digital readout besides the pointer" in the display info screen. I dealt with the 21 inch front wheel issues on my shovelhead with front drive..it was always off roughly 7 mph ( @ 70 I would actually be doing about 62 ish* )..plus one less cable hanging off the front end of my 93 heritage softail dead nuts accurate.

 

I looked at them but none are water resistant.
How does yours handle the rain?