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spudfan

Member Since: 10 Sep 2007
Location: Co Donegal
Posts: 4736

SPEEDOMOTER AND TYRE CHANGE

I RECENTLY FITTED 235/85/16 tyres on a DEFENDER 90 THAT PREVIOUSLY HAD A LARGER TYRE SIZE(265/16). THE SPEEDO NOW UNDER READS BY A SMALL AMOUNT BUT THE FASTER YOU GO THE ERROR SEEMS TO INCREASE. IS THERE A FITMENT PART ON THE BACK OF THE SPEEDOMETER THAT CAN BE CHANGED TO CORRECT THIS? 1982 88" 2.25 diesel
1992 110 200tdi csw -Zikali
2008 110 2.4 tdci csw-Zulu
2011 110 2.4 tdci csw-Masai

15th Oct 2021 8:01pm

90 Dreamer

Member Since: 13 Jul 2019
Location: Oop North
Posts: 2178

2016 Defender 90 Puma 2.2 HT Corris Grey

Thread here talking about it

https://www.defender2.net/forum/topic80616.html

15th Oct 2021 8:08pm

spudfan

Member Since: 10 Sep 2007
Location: Co Donegal
Posts: 4736

Thank you very much.

1982 88" 2.25 diesel
1992 110 200tdi csw -Zikali
2008 110 2.4 tdci csw-Zulu
2011 110 2.4 tdci csw-Masai

15th Oct 2021 8:19pm

I Like Old Skool

Member Since: 23 Feb 2015
Location: Manchester
Posts: 824

1994 Defender 110 300 Tdi ST Coniston Green

I'm a bit confused by this. I assume your previous tyres were 265/75R16? The 235/85R16 size is the same diameter/circumference effectively so there should be no change in Speedo accuracy.

15th Oct 2021 9:07pm

spudfan

Member Since: 10 Sep 2007
Location: Co Donegal
Posts: 4736

That is what I thought but the car is not mine and I have been told that the speedo is slightly out. 1982 88" 2.25 diesel
1992 110 200tdi csw -Zikali
2008 110 2.4 tdci csw-Zulu
2011 110 2.4 tdci csw-Masai

15th Oct 2021 10:50pm

Leamreject

Member Since: 19 Dec 2020
Location: Middle Earth - Leamington Spa
Posts: 970

I Like Old Skool wrote:
I'm a bit confused by this. I assume your previous tyres were 265/75R16? The 235/85R16 size is the same diameter/circumference effectively so there should be no change in Speedo accuracy.

I’m with you on this…

Ride like you stole it!!
If I’m not on a bike it’s because only a 4x4 will do…
2011 2.4 Puma 90 HT

16th Oct 2021 4:31am

Mo Murphy

Member Since: 01 Jun 2008
Location: Letchworth Garden City, Herts
Posts: 2271

1984 Defender 90 BMW M57 3.0 Diesel HT Auto Pennine Grey

Speedos are designed to over read. If you have the the older cable driven speedo, they just do what they like so they'll under or over read depending on how they feel and the phase of the moon.
Mo The Land Rover 90 - Many are called, few are chosen.

50 Shades of Pennine Grey

16th Oct 2021 5:12am

spudfan

Member Since: 10 Sep 2007
Location: Co Donegal
Posts: 4736

So the moral is..All is well in the state of Denmark (as Shakespeare might say) 1982 88" 2.25 diesel
1992 110 200tdi csw -Zikali
2008 110 2.4 tdci csw-Zulu
2011 110 2.4 tdci csw-Masai

16th Oct 2021 10:34am

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