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  1. #1
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    40mm IS to IS adapters all the same or??

    I'm going to go from 160mm to 203mm rotors and am looking around at the adapters and am a bit confused... Shimano makes adapters but has different adapters for Front and Rear and charge ~$40 each? I've also seen the A2Z adapters for half that and they just have a single 40mm adapter and some no-name adapters for $14 on eBay.

    My question is if there is a difference between the adapter brands that I need to worry about? Anybody use the cheapo adapters and have to switch to a better made one? I'm running XTR calipers on a Cdale Prophet with a lefty so I am IS to IS...

    Thanks and Ride ON!

  2. #2
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    The adapters front and back are different, but a +X0mm adapter should work both places.

    Just look at the adapters you have now.

    If you put a back adapter on the front you can move from a 160mm rotor to a 180mm rotor.

  3. #3
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    Thanks! With the M965 calipers, I don't use adapters at all, the calipers bolt up directly to the frame and fork and I use shims to adjust the brake line. In retrospect I should have gone with XT calipers but I snagged a sweet deal on the XTR stuff. I had considered doing exactly what you said, using 180mm rotors and moving the rear caliper to the front and putting a 40mm adapter on the rear. This is all inspired by the fact that I have been litterally smoking my 160mm rotors being +200lbs and riding some really steep and long downhills... I figured if I was going to change, I might as well go big.

  4. #4
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    I have a m965 on the back and am trying to get another back caliper to put on the front and use with a180mm rotor now as well.

    I have a Post mount caliper but it rubs my 180mm rotor on the front...

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