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Instructions for the modification of the SRAM XX crank arm to mount the 36 teeth chainring Instructions for the modification of the SRAM XX crank arm to mount the 36 teeth chainring On cranksets SRAM XX to use the chainring 36 teeth, which is the minimum external, it is required a small change to the external diameter of the four arms of the spider It can be executed with tools such as rasp or grindstone, as you can see from the photos below. If necessary it can be done by us by CNC milling at a cost of Euro 20, after the receipt of the crank arm at your cost