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@Oswald
Other then the obvious change in gearing and as long as you lower your mech slightly to maintain the required gap with the smaller chainring everything will be fine. You may even notice a slightly quicker front change with 49 / 36. A standard road front mech capacity is generally quoted as 16T, but the less teeth difference the less the chain has to 'climb' the ring to make the change. I use 48 / 36 on one bike and 48 / 38 on another bike. Shimano cross crank set ups are standard 46 / 36 ..
As for the rings .. Take your pick. The Stronglight ones are made by TA. Personally I prefer TA or Stronglight CT2. For Stronglight CT2 try http://www.xxcycle.com/