The Homegrown elite models year 1999 have the 22 mm rear disc mount.  Other wise later years would have the IS standard. 


I have 99 4-banger and run 2.24 WTB mutanoraptors.  There’s plenty of space for the rear tire.  Never had issues with the tire rubbing on the seatstay.  Maybe your pivots were loose?


Good luck in building your frame.

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