I have read the threads about coverting to 2X9 and thought that it was a straightforward process. If that is the case please excuse the dumb questions .
I thought that it's possible to remove the middle ring and replace it with the outer ring. I have tried every combination possible and it will not fit unless I remove some metal inboard of the bolt holes on the chainring.
I plan to ride my bike mainly on the pavement. Given that I wish to use a 42T chainring in the middle position, what is the largest size inner ring that is practical and where can I buy it? I realise that the size is likely to be limited by chainstay clearance.
It would appear that a 28 or 29 X 42 combination will work.
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