speedo

PhilC · tinkerer Joined: 02 Apr 2002 Posts: 163

My speedo is about 10 km/h too slow. Can anyone tell me how can I fix this?

PinkBitz · petrol head Joined: 13 Apr 2002 Posts: 1594

get it recalibrated. or get bigger tyres.

TG 1985 · backyard mechanic Joined: 08 Jan 2002 Posts: 550

yea, mine feels a bit fast, how do i recalibrate it?

tx gem · rice boy Joined: 30 Sep 2002 Posts: 16

as soon as you change tyres or rims depnding on what changes you make will affect the speedo and you'll have to get it re callibrated, look in yellow pages for spedo speciallists.
if you had 175x75x13inch rims/tyres
and you swapped to 175x60x14 it wouln't be so bad,but if you had 175x75x13inch rims/tyres and swapped to 175x70x14 the spedo would be out by miles, it all deppends on the total circumference of the outer section of the tyre.
I,ve got 195x50x16 and my speedo's only just out,because if you put my rim and tyre beside a stocky,there virtually identical.

PinkBitz · petrol head Joined: 13 Apr 2002 Posts: 1594

check this site out and compare your tyres to the standard gemi tyres 155/80/13.

http://www.miata.net/garage/tirecalc.html.

txgem your speedo is 4% too slow. when speedo reads 100kph, you are actually doing 104.

Klown · tinkerer Joined: 11 Aug 2002 Posts: 374

lol my speedo's 22.5 percent out haha well ya get that but its good coz i havent been caught yet

PhilC · tinkerer Joined: 02 Apr 2002 Posts: 163

I have 195/50/14 tyres on my gem so it must have been way out before they were even put on