Can I make up a connection where the rating and the
size of the two hubs are the same but one has a SR ring groove and the
other an RX ring groove?
See the cut-away illustration below of the existing hubs most often
mentioned when people want to know about the possible connection of SR
to RX groove hubs. As you can see, the ring groove pitch diameters have
a difference of 0.031", with the SR ring groove having the smaller pitch
diameter. The original design of the 21-1/4 2M hubs allowed a stand-off
gap between the hubs that the adoption of SR ring grooves eliminated.
Using a hub with an SR ring groove in combination with one having a
conventional RX ring groove will result in a miss-fit of the gasket
between the hubs, and a stand-off between the made-up hubs equal to one
half of the original design stand-off of the connection. The
illustration shows the connection assembled but not tightened, tightening
the connection would form the gasket to the grooves and coin the gasket
flanks. We believe the connection will seal, but we haven't tried it.
Should you try this connection, and it does or does not seal, we would
very much like to hear about your experience. Remember, this connection
does not meet any existing specification, and we believe no one would
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