What's the standard trye size on an NB?

poison · Post by **poison** » Sun Sep 13, 2009 6:26 pm

Can someone please tell me the standard tyre size on an NB. My speedo reading seemed low, so I checked it against 2 GPS's (which read the same) and it's way out (Reads 100 when doing 112, which is outside WOF standards).

Stevo · Post by **Stevo** » Sun Sep 13, 2009 6:45 pm

Depends on the year but my 98 runs 185/60x14" . Later models went to 15". Cheers Stevo

brownie · Post by **brownie** » Sun Sep 13, 2009 8:38 pm

Check the inside of your drivers door .Tyre placard in there will tell you,
Should be
185-60-14
195-50-15
205-45-16

Ian · Post by **Ian** » Mon Sep 14, 2009 9:14 pm

Stevo wrote:Depends on the year but my 98 runs 185/60x14" . Later models went to 15". Cheers Stevo

Actually it also depends on engine size...1.6 NB runs 14" wheels while 1.8 NB runs 15" (195/50x15) from 1998 or 16" (Mk 2.5?) or even 17" (in the case of the factory turbo).

poison · Post by **poison** » Mon Sep 14, 2009 11:18 pm

Indeed it was on the side of the drivers door, I was looking at the tag on
the pillar and didn't notice the one on the door. It seems it was 185/60/14
or 195/50/15 which have rolling diameters of 71.4cm and 71.2cm respectively.
I'm running 215/40/17 (74.7cm) so the error should only be about 5%. Yet
from my research stock speedos tend to read about 5% high anyway (an inbuilt
safety feature on most cars to avoid litigation in case of speeding
tickets - or so the conspiracy theorists say). So that should have balanced
out, the speedo I've got is reading around 12% low thus increcing the risk
of tickets.

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Stevo · Post by **Stevo** » Tue Sep 15, 2009 7:08 pm

Thats a fair way out. It will probably pay to get it re-calibrated. Cheers Stevo

Euen · Post by **Euen** » Wed Sep 16, 2009 1:51 pm

I wonder if someone in a previous life has changed the diff ratio without changing the speedo drive gear in the gearbox.

E

poison · Post by **poison** » Wed Sep 16, 2009 2:45 pm

Definately needs to be sorted. Igot a price of $250+gst to reset the
odometer so a recal would be big $. I'm looking at a jaycar kit for
$65 that should be able to calibrate it. All a pain though.

Have we got 2 stevo's here?

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poison · Post by **poison** » Wed Sep 16, 2009 2:45 pm

Good point My original speedo was fine, I swapped it for a white dial
mazdaspeed one for it. Same model so should have been the same ratio.

Gazza
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Euen · Post by **Euen** » Wed Sep 16, 2009 3:59 pm

There is some info at the bottom of the page here on drive gears http://www.solomiata.com/Drivetrain.html

I have a couple of different ones if you want to try them out. Can't remember which ones but I think red and purple. They are quite easy to remove and replace from under the car.

E

poison · Post by **poison** » Wed Sep 16, 2009 4:42 pm

Thanks. That might be the key, I had mine out a while ago as one of
the wires came off during the clutch job. From vague memory the gear
was white or green. But I could be wrong.

Gazza

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Stevo · Post by **Stevo** » Wed Sep 16, 2009 5:29 pm

poison wrote:Definately needs to be sorted. Igot a price of $250+gst to reset the
odometer so a recal would be big $. I'm looking at a jaycar kit for
$65 that should be able to calibrate it. All a pain though.

Have we got 2 stevo's here?

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[Posted via external email]

There can only be 1 Stevo............. Cheers Stevo

poison · Post by **poison** » Mon Sep 21, 2009 11:13 pm

Good news, albeit at $65.00

I got a speedo correction kit from Jaycar
http://jaycar.co.nz/productView.asp?ID= ... rm=KEYWORD

It took about 2 hours to make - mainly due to excessive care being takne not to stuff it up given my tendancy to lose interest and not pay attention - I really didn't want to put this in and blow something up.

Another hour to research the correct connections, and an hour to fit and 30 mins to test and calibrate. Now reading spot on at both 50 and 100km/hr

So all up $65.00, an evening and a couple of hours on a Sunday and I'm a happy Gazda.