First, Palin drum
Palin: English bearing (bearings) a transliteration of the drum: the bike axle's nickname.

Bicycle axle consists of Palin and Pearl two, Palin bicycle manufacturing technology from abroad, it has been said of the call.

Palin relative to the benefits of the beads slide well, easy to repair, but in turning difficult to manipulate, especially at high speeds during turns easy locking or turning radius is too large.

Pearl drum glides and compared to Palin at a disadvantage, but cornering and handling are its advantages.

Big bike parts manufacturers in the world have different versions, Japan Shimano Pearl drum company focused on application, development of its XTR series high end drum structure of Pearl, both gliding and turning performance gains a lot.

Bikes for the world distribution center for Taiwan several Bicycle accessories manufacturers such as JOY (jiuyu) and the Kun Teng Yu Peilin drum-oriented development and application, achieved very good market response, reputation in the industry.
Second, about the difference between 2 and 4 Palin Palin
Pu Tong-drum is loose beads, like most of SHIMANO products and commercial hubs. Palin drum is the bearing drum, mounted on standard bearing drum shells, turns smoother quieter or adjustment and maintenance, waterproof Dust higher performance. Before Palin drum drums are generally double-bearing, rear drum divided into two-bearing and bearing two, four higher bearing strength. Drum bearing prices from more than 200 a pair to more than 3,000 more have, on the market but can see The cheapest of which is 200 pair of, Taiwan Yu is a good choice. 4 Palin, 2 forest, flower drum after the structure is mainly aimed at Palin. Hubs are basically two before Palin.