Hello Mr ...,
Thank you very much for your e-mail and your enquiry.
As you have already found out, the Birdy is subject to mandatory replacement of the stem tube, steerer tube and handlebars. These components must be replaced after an accident or 10000 km or 3 years (whichever comes first). This is a fixed obligation.
Failure to comply with this replacement obligation will have a negative effect on your warranty.
We hope we have been able to help you and will be happy to answer any questions you may have.
Best regards
Ihr Riese & Müller Customer Care-Team