I had new Pirelli Carrier tyres fitted to the T4 syncro as old tyres were badly worn and in poor balance, esp on the front. With new tyres all seemed good until I drove on the fwy at 100kph - there is a significant shake. At 90kph all smooth and 100kph it shakes and it continues to 115kph, which is...

Could anyone advise approx rpm at 100kph in 6th gear (manual)?

Also thoughts on the GTI for a return daily 150km commute (approx 125km of this is freeway/100kph).

Cheers in advance.