A total of 2,000 Tier e-scooters will be deployed initially, with the number increasing to 4,000 over time.
Shared e-bikes will join the fleet shortly and cargo e-bikes will be available through the nextbike by Tier app by the end of the month.
Earlier this year Tier won the tender to provide shared micromobility services for the West of England Mayoral Combined Authority.
The roll-out in Bristol completes Tier’s takeover of services across the region from Voi, following Tier’s initial launch in Bath last month.
Jessica Murphy, head of public policy UK at Tier, said: “Bristol is an incredible example of how to positively integrate shared micromobility into a busy city. Its uniquely hilly geography and its size make it a perfect match for our vehicles, helping people get around quickly and sustainably without need to drive.
“We are incredibly proud to have the opportunity to serve the people of Bristol and to expand the fleet with e-bikes and cargo bikes very soon.”
This week also marks the launch of the Long Term Rental by Tier service through which Bristol and Bath residents will have access to their own e-scooter, supplied by Tier, for a monthly fee of £40.
To help improve parking conditions in busy areas, 100 parking suitable bays across the region will have physical markers installed, designed to make it easier for users to find the parking bay and to keep vehicles contained to the designated area.
Marvin Rees, Mayor of Bristol, added: “I am looking forward to welcoming Tier to Bristol and working with them to build on the huge success of Bristol’s e-scooter trial, including on issues of safety and parking.
“Expanding the service to include e-bikes will mean even more people can access sustainable transport easily across our city, helping towards our net zero ambition and adding to the 10 million rides already taken in Bristol since the start of the scheme.”