I added the Show Chrome riser to my 2021 RT and used just the basic riser, not the additional "shims" provided in the kit, and I am amazed at how much more comfortable it has made the riding position for me at 5'7". The RT, which I've had now for almost 2 months, was comfortable right from the start, but it did require me to lean a bit forward. This started to bother my back on rides of over an hour. With the riser I now sit fully upright and even on short rides it has made a big improvement. I'm just posting this in case there are others out there that might not have thought about adding this simple accessory.