My Deore LX I had on the old Northwoods is an M550, according to Shimano the Max chainring size is 46t with a 26t range but it worked flawlessly with my 53/42/32 crankset. My FD-R443 came yesterday and I compared it to the M550, the pivots are noticably closer together on the R443 than on the M550 so I'm skeptical of the claims I've read that it works with MTB shifters until I try it myself.
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".....distasteful and easily triggered."