>>1904145It's definetitely a reliable quality piece of kit, but it won't climb well. It's also quite a bit heavier than a traditional drivetrain.
If you haven't decided on getting the IGH, the easiest way to tell a cassette is by the lowest number of teeth in the back: it should be 11 or 12.
>>1904151I recon it should fit, but try it on before you buy it if possible. Generally, you want the rack to be low and close to the fender for best handling. The surface of the rack should be parallel to the ground in the desired height setting, be sure to check that.
I use a rack similar to the pic, but dropped to the lowest clearing setting. Handles better, twists less and looks better.
Some really hate bolt together racks, but haven't had any trouble in the years I've been using mine.
Just please don't get a seatpost clamp rack