I got these because I had too narrow of a q-factor on my old XX 2x10 cranks to convert to 1x11. In a 2x setup using an old XX 39t ring as a bash guard I have enough room to run a 30t narrow wide Blackspire Snaggletooth ring for the steep rocky rides. For racing and lower elevations I have a RF direct mount 32t ring that works very well. These cranks are a killer deal due to the removable spider allowing for XX1, XO1 spiders or a direct mount ring from either SRAM, Absolute Black, Race Face, Wolftooth, and others. The actual weight for the cranks without the spider and BB is 470g in the 167.5 q-factor GXP version. I like how stiff these cranks are under my substantial 220lbs+ gear. Bottom line if you want light stiff and strong cranks but don't want to break the bank these are your ticket.