your informations First Name Last Name E-Mail Phone your part Brand COMMENCALOther Other Brand Year of purchase Order number (optional) Serial number (located on the underside of the bottom bracket shell) your files File Attachment 1 - Proof of purchase, online order or invoice. (required) File Attachment 2 - Photo of the full bike. (required) File Attachment 3 - Photo of the serial number. (required) File Attachment 4 - Close photo of the problem. (required) File Attachment 5 - Close photo of the problem. (optional) Your message (optional) Send Δ