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Is there a general rule of thumb if picking up a wheel of a faster group on an Audax ride, or will my tyres be let down at the next checkpoint
As @hippy says audaxers are terrible group riders. It's pretty normal for someone to ride up behind, sit on your wheel for 10 minutes, then - usually when there is a little hill - they'll attack and come past you at a speed that makes it impossible for you to get a tow back. This happens even with people you think you know quite well.
Also, people on the front don't usually know to peel off, so they sit there for half an hour getting more and more pissed off.
Short of actually pushing people off, you can't go wrong in terms of bunch etiquette on most (uk) audaxes.
Is there a general rule of thumb if picking up a wheel of a faster group on an Audax ride, or will my tyres be let down at the next checkpoint