Could you tell us why you want to know the specification of "tr" and "tf"?
Actually I checked many BST sensor datasheets, the specification of "tr" and "tf" is unavailable.
Talked to the internal experts, we all thought I2C timings in the datasheet are enough when the customer want to konw the timing specification for I²C of BST sensor.
Thanks for your understanding. If you have any further requests, please visit https://www.bosch-sensortec.com/about-us/contact/contact-form, and use the contact form to submit your request.
Or you can contact the local FAE to get more infomation of BST sensor you concerned.