There are a number of services that I offer at TJ Cycles. One of the services available is the Hub Service. You can see below a list of possible faults in this area of the bike and the repair that will be carried out with this service.
Loss of Drive when Pedaling Renew Hub
Wheel continues to drive when not pedaling Renew bearings in Hub
Excessive side play in wheel Renew Paws & Springs in Hub
Wheel noisy and gritty