Not even for the bike but for the car. My Focus has 205/50/16 on it at present. I'm biting the bullet and sticking winters on it this year for....well...the winter I'm thinking of getting some part-worns off fleabay but the choice is pretty thin in that size. A lot more choice in 205/55. Reckon this would cause any problems???
Not if the arches are big enough to accommodate it. Speedo will be slightly out but otherwise absolutely fine. Your spare will be a different size though which would make the drive a bit more 'interesting'
I will have a look at some winter tyre prices for you tomorrow Rich when I'm back at work Since your not a million miles away from me I might be able to help
Calculator here :- ScoobyNet Diameter difference: 0.81" (3.24%) I run Vredestein Quatrac 3 All Weather tyres on my Focus - work well in All Weathers Vredestein Quatrac 3 | the Vredestein Quatrac 3 reviewed and rated | the online tyre guide
We run Vredestein Wintrac Xtream's on the Merc and they are feckin' ACE TBH. Here they are in my utility room with the youngest before they got fitted last November and fitted before a small Jolly with the Tribe! Here's a link to your size OP Vredestein Wintrac xtreme 205/50 R16 87H with rim protection ridge (FSL) - mytyres.co.uk