When evaluating the durability and performance of MTB tyres, what specific factors and metrics do you prioritize, and how do you weight them in your overall assessment. Is it solely based on the tyres ability to maintain traction and control on various terrain, or are there other considerations such as sidewall integrity, bead durability, and rolling resistance that play a significant role in the evaluation process. Furthermore, do you rely on manufacturer-provided data and specifications, or do you conduct your own testing and field trials to gather empirical evidence of a tyres performance and durability. Additionally, how do you account for the trade-offs between tyre performance and durability, and what are the key compromises that need to be made when selecting a tyre for a particular riding style or terrain.