Transcontinental Race No. 6 - TCR6 - #TCRN06 - 2018

changes in pressure can cause them to leak. They don't have a breather hole. Or rather they do but oil leaves with the air.

That could be a killer on TCR. There will be huge air pressure changes due to:-

• A flight or two to get to the start (assuming not travelling on Eurostar)
  
• Altitude changes (multiple changes from 0m to ~2500m and back down again, etc)
  
• Temperature (from 5C to 50C in the sun)
  
  

I'd also worry about what also gets dragged back in through the breather hole.