8.5J on the back?

[hoshy]

Hi,

i'm setting the csl up for a German winter and looking at tyres. I have a spare set of genuine csl rims in the cellar and was thinking that it might be better to run a slightly thinner tyre on the back for the snowy months.

Hence the question - does the 8.5J work on the back - mechanically, and to a lesser extent, with looks - i.e. will the offest look TOTALLY stupid?

Cheers,