I think I wrote about it in the old forum, but not sure.

Anyway I found that 170/60 is the recommended size for 5" width rims (like the ones of our fazers) by the tyre manufacturers charts. 160/60 are for 4,5" rims like the ones of SV650. So Fazers came standard with a flattened tyre!

I purchased a 3,5" front rim from a Yamaha TRX850, which will allow 120 front tyres (thanks to the mate HybridYZF for the advise). Soon it will be installed and I will report how it goes but the rear tyre is still quite fresh so it will took a while before I change it.

So I ask anybody to try a 170/60 and tell us how it goes

Thanks

You have to change the rim. A TRX850/FZR600R/FZR400R will fit. I have one ready that I'll put soon.

But you can install a 170/60 rear, I haven't tried it yet but actually it is the proper size for the 5" wide rims.