Diff ratio tyre size speedo gear (pinion)

Here's a list of pinions to suit tyre sizes with accompanying diff ratios to get your speedo within specs. It worked for me for engineers. Got my speedo within 4% which is NSW law. cost from Nissan at the time $74. Or you can pay $220 for a Tyre match box. Cheers Jono.

Diff ratio Tyre size Speedo gear (pinion)
Part Number i.e. 4.11:1 ratio running 31” tyres 32703 - 31G 17 Change last 2 digits for gear you need.

3.9:1 Ratio
Tyre Pinion
31 16
33 15
35 14
37 13

4.11:1 Ratio
31 17
33 16
35 15
37 14

4.375:1 Ratio
31 18
33 17
35 16
37 15

4.625:1 Ratio
31 19
33 18
35 17
37 16

well done cheers mate helps to sort out the dark art of speedo v tyres v ratios

Top find and post mate!!! Well done and thanks!!

Great Post mate, im sure will help out a few members at some point

This will come in handy, that's for sure.


Sent from the secret chambers of our secret society, on a secret iPhone, with a secret pin code and eye retina scanning from a secret peep hole, just don't tell anyone OK, cos it's secret........

Top marks TD42

Last time i got some gears from nissan. not many in stock in australia. not sure if their is after market parts.

Thanks mate, an unexpected help for a problem I thought I'd have to just 'follow the traffic' for!

You can adjust the GQ's speedo

There is a trim pot on the dash pcb - I have posted details elsewhere

how good are you, excellent home work, I have cross checked your post and you are 100% correct with your ratio verses pinion drive gear again WELL DONE