Generally, better rims are of at least the double wall variety. The three types we refer to as, "single wall, channeled" - "double wall" - or "double wall, channeled". There are also instances of mountain bike rims that have a double wall construction and channels. Those that have a single wall with channels where the sidewall and spoke bed walls join, those that have double walls, these have a lower wall that the spoke nipples rest on and just above it a second wall that holds the two sidewalls together above the first.
Types of Rims: When you look at the cross sections of the rims we sell, you will see that fall into three types. The same extrusion can be to different lengths to make rims of different diameters, and this is frequently done. The neds are joined and the rims are drilled or "pierced" for the spokes and inner tube valve. The extrusions are cut to the length required for a specific rim, then rolled into a hoop shape. An effort is made to try to maximize the yield in the number of rims it will create, by making the extrusion long enough to cut from it a fixed number of rims with no extra length left over. The exact needed length of the extrusion varies depending on what diameter rim you intend to make from it. The extrusions are made up to about 22 feet long. The squeezing out of aluminum is known as "extruding". These pieces of aluminum after they are squeezed out and cooled are known as "extrusions". The single die generally has several of the rim shaped holes side by side placed horizontally permitting several pieces of aluminum to be squeezed out the die at the same time. This steel piece is referred to as a "die".
The aluminum in plastic state is squeezed through a piece of steel that has a hole in it, in the shape of the rim cross section. Rims are made from aluminum alloy in a near molten, but not liquid, known as a "plastic" state.
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