Surly Framesets come with all 3 MDS chips; singlespeed, 135mm standard QR and Shimano direct mount 142 x 12mm thru-axle
Surly Modular Dropout System gives you the option of 142 x 12 thru axle (Shimano Direct Mount derailleur hanger [axle included]), 10mm QR geared, or singlespeed (complete bikes ship with only 142 x 12mm thru axle chip)
