fattyboy

Don't laugh! I have a second hand spyrogyra n the threads have gone on the top of thr stem. I'm looking to replace it with a onza mod stem (apparently quite popular on 26inch bikes now) ( http://pages.ebay.com/link/?nav=item.view&id=350712397638&alt=web ) Now it says the clamp is 31.8mm but the spec I found of a spyrogyra says the bars are 28mm... Will the clamp fit my bars or do I need new bars too? Or do onza do a stern with 28mm clamp? Confused!!