I would too.
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Would you expect a noticable difference in the spedo reading? My spedo is out ~+10k/h.
Could I also expect a reduction in the RPM at the same speed with the 255/85 oposed to the 235/85's?
In what way is it a bugger? I have a clutch issue at present, going to be fixed very soon I hope!!!!!!!
Fitting a 255/85 is a larger diameter tyre so you've effectively raised your gearing by 8% or so.
With a Tdi when towing you either need to start in low range second gear and shift into high range when you need another gear (high second) or slip your clutch a hell of a lot more on starting.
all speedo's are inaccurate to some degree, i think its and ARD thing. Nearly all cars i have driven with a GPS the speedo can be out as much as 5kms @100km/h
i reckon your td5 will be much the same as the tdi and nearly every other car on the road
OH..........and GO THE CATS
you're not alone in this respect.
255/85s are not legal. (someone should at least acknowledge it)
The speedo being inaccurate with the standard tyres is pretty normal these days, the ADRs state that a speedometer can vary by up to 10% from the cars true speed BUT it cannot read slower than the true speed. New VWs have a the ability to show ECU data on the nav screen including speed as sceen by the ECU – it’s spot on, and the instrument panel speedo is high by 6-8%.