Comment on Do you need to adjust your speedometer if you change the size of your tires?
Kecessa@sh.itjust.works 8 hours agoEh, for the motorcycle bit… No…
On my TW200 (pretty much unchanged since 1987) the speed is based on front tire rotations (there’s a speedometer cable with a part that literally spins inside going from the front wheel to the speedo), on my modern motorcycles it’s based on the ABS ring/brake disc.
When looking at what you see in the cluster, changing the sprocket just influences how much the engine is revving when comparing two different speeds, otherwise it’s about acceleration and top speed.
frank@sopuli.xyz 8 hours ago
Well, I’d argue it’s not a blanket “no”. I’ve owned 9 crotch rockets and all? Of them had speed sensors on front sprockets. A lot of similar or the same designs within, so surely it’s off ABS rings if they’re newer, but a fair few of them have had speed deviations because of that
Kecessa@sh.itjust.works 8 hours ago
So it’s not a blanket “same with motorcycles” either then ;)
frank@sopuli.xyz 8 hours ago
You’re absolutely right!
I don’t know of a single car that it wouldn’t affect, but there could be some using a gps speed instead? Sounds like a bad idea to me