I've been building up the 853 over the last few days and still have a few bits of tweaking to do before it's finished. I did however manage to take it out for a test and I have to say it is even better than I had hoped for. The 30mph speed limit was easily achieved on the level main road, gear changing through the Ultegra rear derailleur precise and smooth as for the brakes, well I don't think I've ever had brakes so good.