The warranty on all Nicolai frames is five years from purchase. Unlike many other warranties ours is valid even under race use and it resides with the frame and not the owner – it transfers if you sell the frame on (though the new owner will need the original sales receipt).
This is a warranty against manufacturing defects – improper use, whether through the type of riding or through the equipment fitted to a frame, and crash damage are not covered.
If you do damage your frame in a crash Nicolai will endeavour to repair it at your cost – the charge is normally very reasonable.
You can download the full warranty details from Nicolai.net
The first step if you do have a problem is to take some pictures of the frame as built and contact your supplier.