Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73080
Or speedo over reads.
One or t’other.
Plus snow’s on the way. Gratuitous cold pic, from here yesterday when it was -5c!
Click image to enlarge
30th Nov 2020 9:14 am
Trailered Movements
Member Since: 16 Jan 2020
Location: East/West Sussex Coast Borders
Posts: 1200
From the many threads on here, and personal experience, speedos always read slower than they suggest, and a move from 50 series to 55 series on numerous LR products ends up with the speedo being more accurate when measured with GPS.
When you consider as the tyre wears the rolling circumference changes, these small differences are in the great scheme of things totally irrelevant, hence why there is a tolerance on speed camera enforcement.
Dave2011 Discovery 4 Commercial SDV6 (Gone)
2010 RRS TDV8 (Gone)
1980 OBLIC 4.0ltr Range Rover (went a long time ago)
30th Nov 2020 9:18 am
RRSTDV8
Member Since: 07 Apr 2014
Location: Here
Posts: 13541
I find, on my RRS, that the 255/55/19 profile tyres give a speedo over read of about 2 mph when measured against GPS speed given by my phone. The RRS normally wears 255/50/19 profile in 19s or the similar circumference 275/40/20.
So when my speedo says 30mph, my GPS is saying 28mph.Visiting from rrsport.co.uk
2012 RRS SDV6
2008 RRS TDV8
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