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IS-PM adapter for 140mm discs

GiraffotoGiraffoto Posts: 2,078
edited February 2013 in MTB buying advice
This isn't the same topic as I posted a week or so ago, asking about an adapter for 185mm discs.

I have a frame with IS tab mounts on the chainstay, and a post mount Shimano caliper (M596)

I'd like to fit a 140mm disc on the back, partly to save a tiny bit of weight but mainly because I figure it'll give fractionally more useful braking between "slow down" and "lock" for a light (8 - 10 year old) rider.

Is there such a thing as an adapter that will do this job, and can anyone recommend one?
Specialized Roubaix Elite 2015
XM-057 rigid 29er

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