If you they are even a teeny tiny bit pinched under the tyre bead they willBIGLOUDBANGWITHLITTLEPUFFOFTALC before you notice. That was an expensive afternoon in the 1990s.
I have snapped the lever body where the bolt goes to hold it onto the bars. Does anyone have a lever body, or whole lever? Left hand lever...
There is one on eBay but it's a RH.