Gearing Change Effecting Speedo Reading - Solution?

It is only an issue if the speedo drive is from the gearbox output shaft and the ease of solution will depend on whether the drive is mechanical or electrical and availability of alternative cigs and dip switches. Sometimes GPS is the easiest option.

 

Will it also affect the TC and ABS on the latest bikes ?

 

IIRC bikes with ABS read the speed from the ABS sensor ring on the rear wheel so no adjustment would be necessary from changing the sprockets/gearing

Bikes that electronically read from the output shaft should hopefully be able to be adjusted using TuneECU
You can alter the ratio by + or - a few % I think up to 10% either way

 

That's interesting ! May explain why they don't offer the speed healer for some ABS bikes (including S3..) cheers for the info

 

If you find no way of altering the changes.
Follow a friend at set speed limits take note and mark the speedometer at these points

 

Dunno if it’s true but I thought you were allowed 10% speedometer error
3mph=10% at indicated 30mph
Think you could’ve argued against that one