Adjusting speedo, due to diff ratio change

Joesmoe said:
Just curious, what are you asking is correct ?

Your speedometer indicates what it does.

Your GPS (or police radar/laser) gives some indication against standard.

That is really the only difference that matters.
Click to expand...
I was asking if my reckoning is correct. I have no idea if my odo is set correct.
 
Pablouk said:
I have some information the triumph diff ratio is 2.846:1 Tyre 240/R16 50 outside circumference 79.9"
mine diff ration is 2.9:1 Tyre 275/R18 35 outside circumference 80.3

Difference mines reading 1.4% fast, is that correct?
Click to expand...

if ? your figures r correct then u would be off 1/2 mile in a 100 miles and a guess of the speedo reading 95 when doing 100 mpr.
just to be on the safe side i would measure the circumference on both tires.
 
Pablouk said:
I have some information the triumph diff ratio is 2.846:1 Tyre 240/R16 50 outside circumference 79.9"
mine diff ration is 2.9:1 Tyre 275/R18 35 outside circumference 80.3

Difference mines reading 1.4% fast, is that correct?
Click to expand...
.00498132 % faster
 
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