Michael Bellis has cycled a lap of the TT course, accompanied by around 50 riders.
The 28-year-old Douglas man needs to raise ?40,000 to travel to America for a brain tumour operation.
Speaking just after he finished, Michael told Tim Glover the Manx public's support has been fantastic (audio file attached):
Researching your Manx family history can be a very interesting and rewarding hobby. Trace your roots in the Isle of Man with our helpful of guide.