IMHO, bike fit and set up have a lot to with which brooks to get and how comfortable it will become. I have a regular B-17, an imperial, a team pro and B-68, each mounted on bikes with slightly different uses, geometry and fit. If your handle bars are level with your saddle, or slightly above - suggest a regular b-17. An Imperial is very comfortable, but works better with a slightly more sporty set up (than the b-17). The b-68 if your handle bars are well above your saddle or your riding position is upright. Have the team pro Ti on a custom steel road bike with fit and geometry optimized for my oddly proportioned body - it is comfortable +++.