I recently obtained an old (late 70's, early 80's) Raleigh road bike with 27 x 1 1/4 wheels. I'm quite new to bikes, but I know the basics (kind of!)

I would like to convert it into a fixed gear and I found this cheap rear wheel on eBay http://www.ebay.co.uk/itm/27-x1-1-4-...item3cc986b94b

It states that it's for single-speed only BUT I was wondering if I could put a fixed sprocket on? And is there any way of me knowing weather I'll be able to put on a lock ring?

ONE more thing... As it's difficult to find fixed gear 27" wheels, if I put on a 700c rear wheel on but kept the 27" at the front would I be able to notice that I'm riding on 2 different sized wheels? Or would I be able to notice visually? I doubt I'd see or feel any kind of difference as it's only 4mm smaller but it's better to be safe than sorry!

Thanks


PS. If you know any shops or sites in the UK that sell fixed gear 27" wheels, I'd really appreciate it if you'd let me know!