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Thanks. I've been on techdocs. Couldn't find much.
http://si.shimano.com/php/download.php?file=pdf/ev/EV-SL-T610-3524.pdf
http://bike.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/SL/EV-SL-M610-3523_v1_m56577569830820598.pdfAre basically the same document. Different title. One of them comes in silver too. Otherwise?
I think M may just be the new version of T. But then I have some ancient groupsets that used an M
Triple?
See if the tech docs explain
http://bike.shimano.com/content/sac-bike/en/home/components11/mountain/deore1/sl-m610-i.html