Hi, until now I used a lot of Bridgestone Tyres for my 1991 ST 1100 (owned 2000-2006) and for my 1990 ST 1100 (owned 2012-). I recently bought another ST 1100 with ABS (1995 model) and I was looking for tyres that could run for more km than the Bridgestone. For my car I only run Michelin and I'm very happy with them. I read that the new Michelin Pilot Road 3 is a great tyre for sport/touring heavy bikes.
I found the front tyre in the original dimension for the ST 1100: Michelin 110/80ZR18 (58W) Pilot Road 3 2CT.
But no way to find the rear tyre in the original dimension (160/70ZR17, circumference ~123.9 cm). Although this tyre exists in the 150/70ZR17 (circumference ~209.5 cm) and in the 160/60ZR17 (~203.8 cm) dimensions.
I saw in your pages, that you suggest to use the 160/60R17 when the 160/70R17 isn't available... why don't use the 150/70R17 ? The circumference is more similar to the original one...
I really want to try the Michelin Pilot Road 3 on my ST 1100... ;-)