Dura Ace 7900 Hub Adjustment

mikegrad

Hi, i've just treated myself to a new Dura Ace 7900 C24 wheelset, but the bearings on the front wheel could do with being loosened off a bit as there seems to be just a touch too much drag when it spins. I understand that cone spanners are no longer required and two 5mm allen keys are the only tools required to remove the axle. My question is, once the end cap has been removed, do I then need to slide off the cone holding tube to adjust the cone itself, or do I just turn the cone holding tube to loosen the cone?

Also, the rear freewheel doesn't seem to spin as well as other Shimano wheels that I have (Ultegra 6700). Could this also be a case of the cone being too tight or are freewheels independent of bearings? Is there some kind of 'break-in' period for new freewheels?

Thanks for any help!

desweller

Be aware that there will be slight drag due to the seals in the hub. If there is no play in the bearings and they are not obviously tight (e.g. bearing rumble) then you do not need to adjust them.

Most rolling element bearing spin freely when they are not lubricated or sealed, but this is obviously not a good way to run them under load; it shouldn't therefore be taken as a reliable indicator of bearing adjustment.