Dear Jeff Thank you for contacting FOBO, The FOBO Bike 2 sensor shouldn’t have an issue to be mounted on the 90-degree. The only common issues we found on the 90-degree valves are the clearance of the valve stem to the brake calliper when sensor mounted. We strongly recommend you to check with your workshop for the clearance of the complete assembly by referring to the dimension of the products as below. Please ensure sensor clearance with vehicle parts is 10 mm (rubber valve) and 5 mm (metal valve) for installation, respectively. (For metal valves only, the most definitive test is to push the motorcycle which has been installed with the sensors for a short distance forward or backward to ensure that the closest part such as the brake calliper does not knock or touch the mounted sensors.) Please let us know how it goes, should you have any issue arise, you may revert to us for further Best Regards Amir Bayati FOBO Support Team