Bike Sizing?

I am the same height as you and have a TCR - you need at least a small - maybe xs.

Geo here: http://www.giant-bicycles.com/en-us/bikes/model/defy.5/9014/48856/

I guess the first number/reference size is the seat tube.

Xs/43.0 | 51.5
s/46.5 | 53
m/50.0 | 54.5

*I *doubt that you will need a 54.5cm. 53cm sounds in the right ballpark. The advantage with that is it has a normal seat post so there's some flexibly for you to get an inline or one with more layback if you need it.

Never be tempted to go for a bike that's too big. Especially if you're paying for a new bike.

I also reckon that for the money you could do slightly better. New you're never going to get a great deal more kit, but....

This Jamis is about the same and has 9 speed sora, with a tigra rear and Mavic CXP22 rims... plus some other little bits.

http://www.evanscycles.com/products/jamis/ventura-comp-2012-road-bike-ec031777#features

Also you can go to one of the many Evan's and try it out first for size rather than gambling. Assuming it's not a massive ball ache maybe find out which ever one ed works in and go there.

EDIT: also saw the Jamis frame is made by Kinesis - so that's another plus.

@Ollyit, I'm slightly shorter than you at 5'7" and have a Giant TCR in a Medium. The seattube and cranks (172.5mm) suit me fine, but the reach was a little far for my stubby arms and I've swapped the 110mm stem for a 90mm .

All is good!

Incidentally, why are you getting the Defy 5? There's a Defy 4 on sale at Ash Cycles for £439... http://www.ashcycles.com/site/giant-defy-4-triple-2011?zenid=3a482722cfd40b58136c1f9c37ec09ff

I really would be suprised if a medium would fit properly.

Also just realised that the giant doesn't have carbon forks. Either go cheap for that ^ one for £440, or go for the Jamis (or similar) and get carbon forks and the next tier GS up.

^ it's nice to have these things confirmed though. Especially if you are, like me, a chronic self-doubter.

Bear in mind it does always cover everything, some roadie like to be a little longer after doing core strength, tourer tend to want the handlebar higher, etc.