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These dropouts are compatible with the Sirius 2G and 3G R853 and the Skookum R853: they replace the original 35mm QR dropouts supplied with the frames.
Using your existing hardware the dropouts facilitate the use of 142×12 bolted rear axles.
These will not fit on the Sirius 4G, Moxie or A.L.I.C.E. frames.