Opel Speedster Operation, Safety, Maintenance Manual page 89

Tyres
Restrictions
Not all tyres available on the market
fulfill the necessary design requirements.
Consult an Authorised Opel Dealer to
establish which makes of tyre have been
approved by Opel
Winter tyres
The tyre sizes given may be used as winter
tyres (M+S tyres).
Tyre chains
Restrictions
Tyre chains may be used on the rear drive
wheels only.
Further information - see page 56.
Wheels
Tightening torque: 90 Nm
Tyre inflation pressures in bar/psi
The tyre pressures given are valid for cold
tyres. The increased tyre pressure
from extensive driving must not be reduced.
The pressures given apply to both summer
and winter tyres - see page 56.
Tyre 1
currently Front
175/55 R17 81 V
225/45 R17 90 v
resulting
Inflation pressure with full load
1 8/26 _
-
(bar/psi) 2
Rear
1.9/27.5