Orbea size

Anyone have info on orbea sizing. Looking at an avant and orbea website says I'm a size 51. I'm 5ft 11 with a 32 inside leg.
Internet shops selling the bike say I should be a 55. I'm 2 and a half hours drive from a bike shop so need to buy online and could do without the hassle of trying to swap it if doesn't fit.
Internet shops selling the bike say I should be a 55. I'm 2 and a half hours drive from a bike shop so need to buy online and could do without the hassle of trying to swap it if doesn't fit.
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I have an Orca which is a bit more racey geometry than an Avant. I am 5'11'' like yourself but with a 33 leg and ride a 55. I think a 51 would be too small.
Thats where I'd saw them when I was away for work last week, the bike guy wasn't there though to get a shot on 1.
Just looking for something cheap. Not road cycled for years so lookin to get started.
For that money you can't go wrong.