I am going to be using a 11-32 cassette, and a shimano 105 short rear derail. I was thinking of using a 36t up front but that's what I run on my DH bike. I just want to be able to ride around town and stuff or the BMX track without feeling like I've ran out of gear. If I go between a 32-36t I can get the E.13 STS, but if I want bigger I have to go the SRS. I haven't gotten one yet but was just curious what you guys that ride 4x/BMX/Urban on a MTB use for gearing.