Long-established Island car dealership Mychreests has expressed disappointment at losing the contract to supply official cars for the TT.
It's been handed to Audi - which is thought to have agreed a two-year sponsorship deal.
The move brings an end to a long association between TT and the Mylchreest Group - which has provided course inspection and roads open cars and drivers for 60 years.
Managing Director David Mylchreest says the company was given just three days to submit a formal proposal - but was not invited to match the terms of Audi's deal.
He says the writing may have been on the wall, after the big shake-up in the TT's organisation (audio file attached):
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