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A friend of mine acquired new final drive rear sprocket and chain for his rigid framed Single. The chain is Regina 520 and the sprocket/brake-drum is an after market replica of uncertain manufacture. The chain does not fit properly on to the sprocket/brake drum. It seems that the sprocket machining is slightly smaller than the chain pitch. The width is fine. The chain size is stated as 5/8 X 1/4 inch and the 520 description covers this size. Is this a known problem and is there a way to rectify this problem ? Thanks, Howard Robinson
Send the sprocket back for…
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Send the sprocket back for a refund with a strongly worded letter. 520 =5/8 pitch X 2/8 width, though may have a different diameter roller. google "the chain man" and give him a call