I have not experienced a newer RT for comparison, so I can only relate experience on my wife's '17.
My knees are not bad enough to cause me any problems, but I do appreciate being able to move around a bit. In my limited time riding HER bike, I have not had any problems, but we had boards installed while at Maggie Valley in October. They are the "Floating Boards" from Can-Am Spyder Accessories. They do allow a few more inches of leg movement that even you short guys would appreciate. At my 6' 5", it's even more appreciated.
You are talking sense there, please stop. :joke:
If there is any one thing that bugs me about the Spyder, it's the fact that I have to lift my entire leg to get my foot off the floorboard to step on the brake pedal. It's even more difficult when in a left-hand turn and you are bracing yourself with your right leg. On top of that, you need to modulate pressure with your entire leg, not just your ankle muscles. Yes, a hand control would be welcome, but it's not all that easy to manipulate the hydraulic actions involved. For example: if you were squeezing a bit on the hand control then stepped on the foot brake, the pressure from the foot brake would have to push the hand control back to its 'home' position before doing any useful work on the brake disks. And once the hand lever is back in its 'home' position, there is that little compensation port that allows for fluid expansion when it warms up. That would also allow pressure from the foot control to escape. There are reports of hand controls that have been added, I just don't know if they were hand control ONLY or if they were in tandem with the foot control.
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