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Author Topic: RPMs and Speedo accuracy  (Read 2609 times)

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skreminegul07

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RPMs and Speedo accuracy
« on: June 27, 2010, 08:58:50 PM »
Just as the NASCAR drivers determine pit road speed, I am wondering about the calibration /accuracy of the speedometer on my FXR4.  I did replace the speed sending unit last month, but they are all the same as far as i Know.  Factory size tires, etc.
At 3000 RPM, the speed read 50MPH, but I was passing cars on the highway.  No windshield and I ride the Street Glide a lot so I've apparently lost the "in the wind feel."
Anyone know what 60 MPH would be in RPMs? 50 MPH?
On my street glide 65 is 3000 RPM, so this seems wrong.

Thanks
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jmhenrie

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Re: RPMs and Speedo accuracy
« Reply #1 on: June 27, 2010, 10:58:14 PM »
 i would borrow a GPS and check  your own bike.  on my 3 different bikes i have always found that Harley's read high on the speedometer
cheers
mike
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ltank

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Re: RPMs and Speedo accuracy
« Reply #2 on: June 29, 2010, 07:00:42 PM »
Hi,
 I have a 2000 FXR4. In 5th gear 3,000 rpm I am am just over 70 mph. Stock gearing speedo/tach.
Ltank
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skreminegul07

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Re: RPMs and Speedo accuracy
« Reply #3 on: June 30, 2010, 09:11:35 AM »
Great, Thanks.  I found a link to calculate that and determined very similar results.  Field test results are worth more than calculated. 
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scobar44

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Re: RPMs and Speedo accuracy
« Reply #4 on: July 01, 2010, 02:08:18 PM »
On my stock FXR2, at 2500 rpm I'm running about 60 mph.
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ltank

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Re: RPMs and Speedo accuracy
« Reply #5 on: July 03, 2010, 09:21:58 PM »
I double checked my FXR4 5th gear 3000 rpm on level ground 78 mph my wifes truck confirms within 2 mph I was going to take photo of speedo/tach but too awkward
Ltank
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JamesButler

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Re: RPMs and Speedo accuracy
« Reply #6 on: July 05, 2010, 07:36:18 PM »
Got these results from my FXR3 today:
2500 rpm @ 60 mph  :)
2800 rpm @ 70 mph  :D
3200 rpm @ 80 mph  ;D
3800 rpm @ 90 mph  :orange:
Too much traffic to get up any higher.  8)
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skreminegul07

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Re: RPMs and Speedo accuracy
« Reply #7 on: July 07, 2010, 07:12:51 PM »
Thanks all for the info.
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JamesButler

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Re: RPMs and Speedo accuracy
« Reply #8 on: July 09, 2010, 08:54:31 AM »
You're welcome,  :2vrolijk_21: Didn't record 50 mph because I'm in 4th gear.
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