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DISCO3.CO.UK > Wheels & Tyres

Slightly larger tyres, Speedo reading higher or lower?
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Yambeta
 


Member Since: 01 Dec 2019
Location: Cornwall
Posts: 2

Sorry I meant From 255/50/20 to 255/55/20  
Post #21030131st Dec 2019 10:47 pm
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 8069

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

Yambeta wrote:
Has fitting the 55 profile in tyre caused a loss in acceleration and given any issues with auto gearbox or error codes at all? From my understanding its similar to changing a sprocket on a motorcycle and basically makes it harder to accelerate And puts more load on engine.


Difference is negligible and almost unmeasurable, I would choose 255-55 If I was choosing.
Simple and very accurate to check the speedo accuracy is on a motorway use the emergency telephones, they are exactly one mile apart, it takes one minute at 60mph to travel between them Thumbs Up It can when others can't,
It will when others won't,
It goes where others don't.  
Post #21030512nd Dec 2019 9:24 am
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Discofour
 


Member Since: 21 Sep 2019
Location: Llangollen
Posts: 28

2014 Discovery 4 3.0 SDV6 HSE Auto Barolo BlackDiscovery 4

There can’t be much difference in it it’s only like buying some all terrains with 15 mm of tread on and then running it down to legal limit 1.6 mm.  
Post #210949931st Dec 2019 1:45 am
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 8069

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

ISTR on my old D3 there was a setting in the satnav to be made when new tyres had been fitted, this automatically adjusts the speedo to take into account the slight difference in rolling circumference as tyres wear.
My calculations mean you would be doing 52mph with a 50mph reading providing your speedo is accurate, but as most Speedo’s already read 5% fast you would be doing 54.5mph with a 50mph reading, enough to get a ticket Big Cry It can when others can't,
It will when others won't,
It goes where others don't.  
Post #210950631st Dec 2019 7:05 am
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