Yellow Zebra Bike Tours
Regularly scheduled tours: An entertaining bike ride propelling you through history & Budapest's major sights from the Heroes' Square & City Park to Downtown Pest & the Buda Castle District. Private tours: Budapest bike tour, Night-rambler-tour, Szentendre by bike, Theme rides. Yellow Zebra also offers bycicle rentals.
The link address is: http://www.yellowzebrabikes.com/bike-tours.html