I ride a 2005 Specialized P.2 which has the old ISCG hole spacing. The stock chainguide broke and I wanted to get an E-Thirteen guide. They offer both a chainguide with the old ISCG hole spacing as well as the now-standard ISCG-05 spacing. The dilemma is that I will likely buy a new frame in the medium-term future which will undoubtedly use the ISCG-05 standard. The ISCG-05 chainguide comes with an adapter that you mount under the BB cup, but the adapter will not fit unless I grind away the ISCG-old tabs on the frame.
Should I:
1) Buy the guide with the new spacing, grind away the old tabs, and use the BB adapter. I will then be able to move this chainguide to my hypothetical future bike.
or
2) Buy the chainguide with the old spacing because [insert reason using the BB adapter is a bad idea] and [insert a way that I can make a guide with ISCG-old spacing work on my hypothetical future frame]
PS: Does anyone have any helpful tips for using the BB mounting scheme or special considerations for grinding aluminum?
Should I:
1) Buy the guide with the new spacing, grind away the old tabs, and use the BB adapter. I will then be able to move this chainguide to my hypothetical future bike.
or
2) Buy the chainguide with the old spacing because [insert reason using the BB adapter is a bad idea] and [insert a way that I can make a guide with ISCG-old spacing work on my hypothetical future frame]
PS: Does anyone have any helpful tips for using the BB mounting scheme or special considerations for grinding aluminum?