do all types of speedometers register the same?

[rendevone]

Hello, In one of my provincial tours, driving several vehicles with other family members. I maintained a 100kph on the highway, just to be apprehended by the other drivers at the end of the journey that we were hitting 115-120. Do all speedometers register same speed? I drive an 88 galant, my bro, who apprehends me drove a 94 liteace.
My wheel is 15" rim, 55 series. the liteace rolls on a 70series x 13" rim.
well, just want to be informed, can't drive two cars at the same time.

[rendevone]

later model cars, eg. civic 08 has digital speedmeters, visible from other cars running on its side, i noticed the discrepancy in speed registration.

[1D4LV]

assuming both cars are on stock wheels, the speed will almost be the same. may around 2% discrepancy lang if ever.

[rendevone]

thanks sir, does it mean, bigger and lighter rims give little advantage on speed...?

[1D4LV]

thanks sir, does it mean, bigger and lighter rims give little advantage on speed...?

its more on the size. for reference, please see this link:

http://www.miata.net/garage/tirecalc.html.
check mo yung speed difference sa ilalim if you change your tire/rim size.

[rendevone]

its more on the size. for reference, please see this link:

http://www.miata.net/garage/tirecalc.html.
check mo yung speed difference sa ilalim if you change your tire/rim size.

wow, just checked the site. that was great! I appreciate that much sir. Thank you!