Does anyone happen to know a good rear thru axle replacement? Loving my Topstone 105 so far, but when you attach a rack to the back, it interferes with the thru axle handle. Looking for an axle that won't make it so I have to remove the rack every time I want to take the rear wheel off. I'm not sure which axle length I should be looking for, though. Everyone, including Cannondale, has told me 12x142 so far, but that's the hub length, not the axle length.