If you need gradients on your turbo, just stick some bricks under the front wheel. Winsford, two bricks, Meriden Hill, three bricks, Alpe d'Huez ten bricks, and so on. For downhill sections stick 'em under the rear wheel instead, and shove a fan in front of your face at maximum setting. For the most realistic Coventry cycling experience, you'll want the missus stood next to you. She should lob half-empty fast food containers in your general direction whilst shouting "get out of the f**king road, fat boy!".