Bike Sizing

Hi all

I have finally decided on a bike (Giant Defy 5) this is after being warned off anything cheaper and having a really small budget.  Ive been to 2 local bike shops and been told i need a different size in each.  One said a Med another med/large. 

I know by reading the forums people say it is what fits best but to be honest ive never ridden a roadbike and they all feel uncomfy to the same level.

The bike willbe used for a few duathlons/tri's ive entered.  Also for 14m each way work commutes each day.  (ive been doing it on an old mountain bike till now.

Iam 5ft 8 1/2.  Weigh 12st have a 32 inside leg.

Any helpwelcome so i can finally take the plunge.

also a completenoob thing - will the roadbike really make that much difference to my mountain bike time over 14miles?

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