BB

Bottom brackets from Tange Neco RPM and modus. They are all interchangable with each other to a certain degree and all use the Shimano tool. None of them are symmetrical. The small ring is a Shimano freehub spacer which works as a chainline spacer inside the adjustment ring. A Shimano gear spacer will also work to move the chainline the other way. It may be possible to use a dual row bearing on one side to also move the chainline 3mm. One of the bearings failed by fracturing and I was able to remove it with a hammer and broken axle it came out in pieces. There is no excuse for this good sealed bearings will not break in normal usage. A BMX bottom bracket bearing is also shown for comparison. This bearing also fits some unicycles and I can attest to it's indestructability

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