Hi check here there are several rent a bike in Porto but not sure if they have what you looking for https://www.bimbimbikes.com/s/Porto%2C+Portugal?ne_lat=41.31859253699771&ne_lng=-8.530642159179706&sw_lat=41.00221724447515&sw_lng=-8.762728340820331&filters%5B%5D=Road+Bike&zoom=11&sort=distance
GaiaBike was the best in the end. €40 for a day for a Tarmac Sport 105, and they delivered it to the hotel.
@dbr started
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Hi check here there are several rent a bike in Porto but not sure if they have what you looking for
https://www.bimbimbikes.com/s/Porto%2C+Portugal?ne_lat=41.31859253699771&ne_lng=-8.530642159179706&sw_lat=41.00221724447515&sw_lng=-8.762728340820331&filters%5B%5D=Road+Bike&zoom=11&sort=distance