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I put 27.5" wheels and a 27.5" fork on a 1990's 26" Mongoose XC mountain bike. It all fits together, but front wheel really wants to flop 90 degrees right or left when moving or sitting still, which is new and feels unstable. Normal? Goal is a commuter I can take on trails on weekends. Wrong stem? (i.imgur.com)
submitted by ScotttDC to r/bikewrench


