xj9140
NAXJA Forum User
- Location
- Sacramento, CA
Driving down the interstate my speedometer reads 85, but the radar sign says I'm only going 79. My tires are 37x14.50. Do I need 35's or 39's? I dont really want to mess with my speedo gear.
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35's or 39's
- Thread starter xj9140
- Start date
- Location
- Rainy side of Washington
mess with the speedo gear, or regear your axles... or heck maybe even upgrade them to something that'll handle 35s or larger if you haven't already.
razdrvr
NAXJA Forum User
- Location
- Red Oak, TX
larger tire is what would make your vehicle move faster at the same RPM. Just not sure if 39s will get ya spot on.
r33pwrd
NAXJA Forum User
- Location
- Sammamish WA USA
You want to change tires to correct speedo? would it not be easier to buy a cheap GPS to put on the dash 
brycexj
NAXJA Forum User
- Location
- Marshfield, MA
throw a gps in the window for cheapest route.
foxwar71
NAXJA Forum User
- Location
- Foxboro, MA
BUY 39" KRAWLERS!!!! DONE!!!!!
vincepru
NAXJA Forum User
- Location
- cleveland, ohio/ KC, MO
what axles are you running and what gears? a speedo gear is only 70$ or so online, and you can get them for like 20-35$ used. theres a link somewhere around here that gives you tire size and gear ratio and the right tooth speedo gear.
ktm racer 419
NAXJA Forum User
- Location
- ROW DIALIN
we are seriously concerned about our speedometer being off?
by 6 mph?
at 85 79 mph?
and the fix is a change in tire size?
huh?
I have had bone stock vehicles where the speedometer was off by that much
by 6 mph?
at 85 79 mph?
and the fix is a change in tire size?
huh?
I have had bone stock vehicles where the speedometer was off by that much
- Location
- Columbus, In
And it was probably an XJ! :roflmao:
- Location
- Columbus, In
X2 please tell me you are running 4.88's or 5.13's.
Coastie
NAXJA Forum User
- Location
- Upper Peninsula, Michigan
Nominated.
Learn to subtract...
Learn to subtract...
xjbump
NAXJA Forum User
- Location
- S.E. Mass, just above the Cape
By the smilie face I really didnt see this as a real question. Never go smaller, unless starting over.
Darky
NAXJA Forum User
- Location
- 29 Palms, CA
A speedo gear is only $35 or so from partsmike. It's easy. I did it in like 10 minutes.
Oil Town XJ
NAXJA Forum User
- Location
- Edmonton, AB
This has to be a joke, nobody can be this dumb? right?
scottmcneal
NAXJA Forum User
- Location
- not here
- Location
- Rainy side of Washington
I keep checking and it still is 4 days after April 1st
rweaver138
NAXJA Forum User
- Location
- Brooklyn, CT
in order to get the correct speedometer reading you need 42x8.5's, simple
-96JeepSpeed-
NAXJA Forum User
- Location
- Tweaker Valley CA. (Spring Valley)
I run 54 inch boggers with a budget boost and a D35 with 3.07s (front and rear!, people tell me its a D30 but i know better.) No fender trimming also. But my speedo is spot on.
- Location
- Rainy side of Washington
You're wrong, I've seen your jeep, its got 30s front and rear not 35s
FIXED
