Isaac have issued a voluntary recall on all complete bikes and framesets made since 2004 after discovering that certain stem and spacer combinations can cause the fork steerer to fail.
If you've got a post-2003 Isaac, you need to take it to your dealer who'll be able to check for signs of damage and also fit a new expander to the steerer.
Other recommendations include:
Download the PDF below for more information. If you own an Isaac and you have any questions, contact your local dealer.
Dave is a founding father of road.cc, having previously worked on Cycling Plus and What Mountain Bike magazines back in the day. He also writes about e-bikes for our sister publication ebiketips. He's won three mountain bike bog snorkelling World Championships, and races at the back of the third cats.