I have been pleasantly surprised that my NON ABS Terra Speedo appears to only be off by 2 mph. Nearly every other bike I have owned has been off by much more. Oddly it also seems to be off about 2 mph regurdless of speed, almost like it is accurate but has a 2 mph adder in there. Therortecly at 5000 RPM the 18" wheeled NON ABS Terra should be going just shy of 80 mph. The ABS bikes with the 17” wheel should be going just shy of 77 mph at the same 5000 RPM. A 3 MPH difference. Given the different wheel sizes, do you ABS bike guys see a greater speedo error or do the bikes have different speedo calculations? On my old X-Challenge the speedo had 3 options; it was in mm for the 3 different wheel/tire options the X-bikes came with. One for the 18” Challenge one for the 17” Country and one for 17” Moto. I have not found any options like that on the TR’s
I can't comment on the ABS bikes but my non ABS Terra is off by 2 mph (high) as well. Just wanted to affirm your findings. I seem to remember someone else saying they had the same 2 mph discrepancy as well. Sounds like it's standard.
I assume then that you don’t have a stand-alone GPS. Do you have a smart phone? Most have a GPS built in, though some need a free app to see the speed. Or find one of these.
I don't really believe those to be all that accurate. GPS can give you a good average sampling and the school zone tow arounds don't get regular calibration.
My standalone GPS (garmin quest) generally reads around 2mph slower than the speedo on my Strada around highway speeds. I have to say this bike has the most accurate speedo of any bike i've had (that I can remember anyway)
Mile markers and a watch will let you check the accuracy of the odometer, but the speedometer will likely differ to that. On my Suzuki for instance, I use a speedohealer to adjust the speedo reading, but while the speedo on that bike is about 9% inaccurate (factory inaccuracy + gearing changes) the odometer is only about 4% inaccurate, so now the speedo reads pretty much spot on, but the odometer only measures 95n for every 100n I travel.
The clock on the Tr is crap. You need a watch with a second hand or a stopwatch. 60mph steady, click on mile marker, click on next mile marker. 60mph=1 mile per minute. How long did it take? I'm sure there is a formula out there to convert time elapsed to do one mile, or 5, or 10, to get the mph.
Yeah, as long as I'm not getting a ticket, it's all good, the rocks and dirt road care not what the speedo reads, and personally not interested most of the time, either the scenery or the trail gets my attention. And that stupid speedo is impossible to read 80% of the time anyway.
Think yourself lucky, my GS 110 is 5 mph fast across the whole range, think of how many miles more it has showing on the mileometer
The error on the speedometer and the error on the odometer or mileometer as you call it are not necessarily the same. In fact, under Australian standards for vehicles (the minimum requirement to be registered), the speedometer is allowed to read up to 10% over the real speed, but the odometer is only allowed a variance of 2% from the actual distance.
