I was looking at the W'TWIN Triban 540 Flat Bar road bike in my local store, they do not have it on line. I am planning to undertake Lands End to John O'Groats this year with a friend of mine. I am currently training on an old mounting bike with road tyres on but I like the very low gears for hills. Will this bike be ok for this trip? Will it be able to carry lugguage ok? Should I get a granny gear added to the back sprocket (not sure of the technical term)? I am 5' 8" tall the frame size by the chart says either a small or medium fram, I tried a medium fram in the shop but also tried out a large frame which I found more comfortable any thoughts or ideas on these questions would be greatley appreciated.