My Funduro had a 21' rim laced into the oem hub. Pretty good gravel bike, I did a couple of enduro type rallies on it. Beautiful road bike ! Very very smooth engine. I'm only just getting used to the xt. Unsurprisingly it's significantly better in the gravel than the beemer, but it's not as nice on the tarseal, feels to me like it's at it's most comfortable cruising about 90kmh, faster than that takes a few minutes to get used to, whereas the beemer, the faster the better it got. The fat tank was not so good for standing, but I managed. Actually I still have a 99 ST, (the missuses' )