30 Day Unconditional Guarantee
For Trek, Bontrager and Electra products, if for some reason you're not 100% happy with your purchase, you can return it within 30 days for a refund - no questions asked!
| Manufacturer part # | 787003661 S5B4BM+9.0 55CD | 787004081 S5B4BM+9.0 50CD |
|---|---|---|
| Size | 55t, Direct mount | 50t, Direct mount |
| Teeth | 55t | 50t |
| BCD | Direct mount | Direct mount |
| Bolt pattern | 4-Bolt | 4-Bolt |
| Speed | Belt | Belt |
| Material | Aluminium | Aluminium |