Tyres for Berlina

[mickl]

I am nearing the end of my Berlina resto and am down to wheels and tyres.
I have bought some 15inch SAAB mag wheels as i am not that fond of the old steel alfa jobs.
The rims I have bought have bridgestone grid 11 tyres size 215 60 15
They fit under the wheel arches and clear the other bits of suspension under the car but will I likely get a problem overstressin the steering using these tyres?
I have calculated only a 1% difference in the tyre circumference orig to these so speedo (very wobbly indicator needle) should read true.
Mickl