Shirley a Long lever blade is a good thing for single finger use innit?
More, umm… leverage? Sorry mechanical advantage…
Interestingly they also have an SLX/LX “Treking” brake which looks a lot like the SLX m675 lever/Calliper but with a longer lever blade and the reach adjuster mounted inboard…
M675
T675
Fundamentally the same brake but with a longer lever blade, minus the finned pads. They’ve done the same with Deore and XT brakes too…
Dunno why that would actually be un-usable on most MTBs, other than those with really overcrowded bars…
The thinking seems to be, take ‘M’ variant lever from MTB group, bung on an even longer lever blade (to reach past gripshifters or suit 3 finger operation?) prefix model number with a ‘T’ flog to “Tourists” there ain’t a whole lot of difference though really, I’d have no issue using one if it fitted…
I’ve got a whole load of other bikes still with really old shimano brakes – pre-servowave probably dating ~ 2003-2007ish? when there wasn’t much actually variation in the lever designs TBH, you’d struggle to differentiate an XT from a Deore at the time other than the text on the reservoir covers, the callipers were the main difference back then, and it’s still pretty much the case that any shimano lever will talk to any calliper so just pick a price point and assemble the bits to suit…