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Tyre size

Posts: 1
Joined: Jun 2018
Location: Scotland
Post: #1
Tyre size

We are upgrading wheels from 18 to 20”, however the factory standard tyre sizes for each rim reduces the rolling circumference on 20’s (235x60 R18 vs 245x45 R20) from 2322.3mm to 2288.7mm (1.47% reduction).

Alternatively we can fit 255x45 R20 which have a circumference of 2316.9mm, only 0.23% reduction.

Obviously I want speedo to be as accurate as possible, and wonder if there is a reason for this, or if anybody has changed tyre size already?

The price of the tyres isn’t too different wither.
28-06-2018 06:19pm
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Posts: 835
Joined: Sep 2011
Location: Australia
Post: #2
RE: Tyre size

Exactly. I fitted 255x45 R20 to my shadow chrome 20'' rims on delivery when new for this very reason, and to be a touch more meaty looking too.

2012 Dynamic SD4 Auto 5-Door / Indus / Black Roof / Vortex / AD / Style 7 Alloys / Panoramic Roof / Rear Vents / BSM / TPMS / Sat Nav
29-06-2018 06:53pm
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