Winter Training Bike / Road Bike - Whats the difference?

I am looking at buying a road bike. I mostly MTB but I want to increase my fitness and I get a lot more road miles in during the winter.
So, been looking and on some sites there are Winter Training / AUDAX Bikes and some are just road bikes.
Whats the difference? Is it just the fact it has mudguard mounts?
TIA
So, been looking and on some sites there are Winter Training / AUDAX Bikes and some are just road bikes.
Whats the difference? Is it just the fact it has mudguard mounts?
TIA
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Posts
Most people who have a winter bike will have a fairly basic spec chainset and wheels (compared to their summer bike) as they stand more chance getting trashed due to the conditions/salt on the roads etc... and so parts are cheaper to replace.
Thanks
The damage done to a good road bike (through corrosion) makes buying a cheap secondhand or cheap new one more then useful.
Kona Jake the Snake
Merlin Malt 4
Or you could just replace the very few components that are susceptible to corrosion regularly - carbon frame, aluminium alloys etc. etc. don't corrode an awful lot.
I borrowed a Giant Defy 4 when a few of us cycled over to Amsterdam to watch the Giro and really enjoyed the feel of it.
Anyone recommend anything?