If it's already 5mph fast with the 18" back wheel it will get faster still with the 17". Do I hear 10 mph over? Going once... Going twice... Matt
It's been a long time since I've had the Terra wheels on, but from what I recall, the odo and GPS were very close if not exact. The speedo reads off the abs ring on the rear wheel. But both Terra and Strada seem to have the same ring. So it must be a calibration issue. I have been wanting to weld up one or two of the slots in the ring on the Strada wheels to see if that fixes the problem. As soon as I get some 'extra' time. HA!!!
I usually ride 10 over the limit (not on public roads of course). So I have to add 15 to the speed limit signs. No one told me there was going to be this much math involved with this bike.
Yea, stock my 21/18 wheeled Terra speedo is pretty close. With the 17's its definitely off. One of us that have been running both wheels developed a revised rear tone wheel that corrects the speedo when using the 17" rim on the 21/18 US/non-ABS Terra. You may find some old posts on the subject.
I'm thinking that if the bike came with ABS then it got 17" speedo calibration. Might be something that is only present on ABS bikes or maybe something that is present on all bikes but disabled on non-ABS bikes. Matt
All the ABS bikes are 17" rear wheeled, Terra & Strada. From some old posts on speedo accuracy it does apear that there are different calibrations in the display depending on the stock rear wheel sizes. Unike what BMW did with the G650X bikes, the TR650s do not allow/have the option to change the sizes. However, having owned a G650X, my Terra is much more accurate. On my G650X I has to set it to the next smaller size just to have a reasonably accurate speedo.
There was speculation back when these bikes came out that the sizes were probably a bit of parts bin engineering with the ABS algorithms for the 19/17 bikes coming from the G650GS and the 21/17 from the Serato.
The dash has settings for the wheel sizes and ABS should read the settings via CANBUS, KiwiApe though demonstrated the settings are not read properly on his machine and as far as we have been able to determine the BMW Dealer diags did not have an ability to change the settings
Just want to mention that although all G650 wheels will fit, the front wheel off of the G650X Moto (the super motard) won't, so there's no easy, OEM way to get a 17" front!
None of the G650X wheels are a direct swap. Only the G650GS or F650GS (singles) BTW the G650X Moto has different wheel/hubs dimensions than the other G650X bikes (Country & Challenge) and don't direct swap with them either.
Thanks NYC. Photos of your old bike are definitely an inspiration as I figure out my own style. I recently ditched the factory mirrors and added Highway Dirt Bikes hand guards - http://www.cafehusky.com/threads/highway-dirt-bikes-handguards-rox-anti-vibe-risers.87223/ Matt
