Speedometer Error on my '23 RT

General discussion of the BMW R1200RT/R1250RT
Post Reply
Motor32
Posts: 114
Joined: Mon Sep 21, 2020 9:26 pm
Bike Model and Year: R1250RT '23
Has liked: 4 times
Been liked: 21 times
United States of America

Speedometer Error on my '23 RT

Post by Motor32 »

I just returned from a ride with my phone speedometer app running on my '23 RT.

Speedometer App speed indicated = 50 MPH / TFT = 53MPH

60 MPH / TFT = 63MPH

70 MPH / TFT = 73MPH

80 MPH / TFT = 83MPH

I was consistently 3 MPH below what BMW had programmed into the TFT speed, FYI. (your results may vary, lol)

Steve

App I use :

Motor32
Posts: 114
Joined: Mon Sep 21, 2020 9:26 pm
Bike Model and Year: R1250RT '23
Has liked: 4 times
Been liked: 21 times
United States of America

Re: Speedometer Error on my '23 RT

Post by Motor32 »

This must have been a fluke that the speedometer (76 MPH), Nav5, and the App all read almost the same 75 MPH on my 2020 RT.

Steve

Image
Attachments
thumbnail (8).jpeg
thumbnail (8).jpeg (151.51 KiB) Viewed 552 times
User avatar
Doctor T
Posts: 1988
Joined: Tue Dec 21, 2021 10:21 pm
Location: west sussex
Bike Model and Year: 2007 R1200RT SE
Has liked: 1136 times
Been liked: 304 times
Great Britain

Re: Speedometer Error on my '23 RT

Post by Doctor T »

You won't find many speedos that are calibrated spot on. IRC Manufacturers are allowed a 5% tolerance, i think it used to be 10%. Also, how do you know the App is spot on?.
My 07 reads 3 MPH more like yours.
Trust me I am a retired Doctor and lecturer at Oxford University of Structural and Mechanical/Electrical engineering.
"Blessed are the cracked, for they shall let in the light". Groucho Marx
Motor32
Posts: 114
Joined: Mon Sep 21, 2020 9:26 pm
Bike Model and Year: R1250RT '23
Has liked: 4 times
Been liked: 21 times
United States of America

Re: Speedometer Error on my '23 RT

Post by Motor32 »

Doctor T wrote: Sun Feb 12, 2023 3:16 pm You won't find many speedos that are calibrated spot on. IRC Manufacturers are allowed a 5% tolerance, i think it used to be 10%. Also, how do you know the App is spot on?.
My 07 reads 3 MPH more like yours.
I'm not 100% sure of anything, but the Nav5 (GPS signal), and the app (GPS and cell towers) are the same speed, so I would say the app is a pretty good indicator too.

Steve
Excellence
Posts: 66
Joined: Fri Oct 14, 2022 8:19 am
Location: Aberdeenshire
Bike Model and Year: R1250RT 2021
Has liked: 25 times
Been liked: 30 times
Great Britain

Re: Speedometer Error on my '23 RT

Post by Excellence »

Compared to my ST1300 which can be as much as 10% low the 1250RT does quite well to be only 4-5% off. This universal and OEM inbuilt variation in speedo accuracy is the principal reason I always install and ride to a standalone GPS unit display regardless of the level of bike tech on offer.
I recently completed ROSPA and IAM and my examiner told me to ride to my GPS display during the tests rather than the ST which is one of the bikes he used to ride in the job.
A glance at the two during the test highlighted that the ST speedo reacted quickly to heavy acceleration but also that the GPS while a bitty slower off the mark, was consistently way more accurate (and despite being a stickler for detail he didn't fail me for a moving traffic offence of speeding so it must've been all good despite the ST saying I should be booked)!
Post Reply