R25 Tyre Load/Speed Ratings

Registered User

 

Join Date: Jun 2015

Location: Dunfermline, Fife

Car: Rover 25

Posts: 29

R25 Tyre Load/Speed Ratings

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I can't get my head around why the tyre load and speed specs vary (randomly?) with the wheel size.

Specs from the R25 owner handbook:-
14" alloy is 86T/86H
15" alloy is 82H
16" alloy is 83V (45 prof), 87H (50 prof)
17" alloy is 84V

Why all the differences if the same vehicle could have any of those wheel sizes fitted?

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R25 Tyre Load/Speed Ratings