The Roads Policing Unit says it'll be talking to cyclists today before a planned ride over the Mountain Road.
On Facebook, officers say although the ride isn't illegal, it may well be unsafe with the amount of TT traffic on the Island.
They say the ride has been widely discussed by Island cyclists on social media.
Police are asking them to reconsider their route, and say officers at Ramsey Hairpin will stop riders and try to dissuade them from taking the route.
Some northern homes to be without water tomorrow
Several sailings cancelled today
Hundreds of artworks available to see online for first time
Government cybersecurity centre warning of bank scam
Nearly £265k paid to install broadband cables
Tynwald to hear report on possible tourist tax
From Pisa to Peel: cyclist plans 1,250 mile charity ride
The Furys are back on Netflix this weekend