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  1. #1
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    Shimano XT Ice Tech Brake Rotors: SMRT86 Versus SMRT86L2 Versus SMRT86S2???

    Hi,

    I've noticed the following various models of Shimano XT Ice Tech brake rotors: SMRT86, SMRT86L2 and SMRT86S2, but have not yet been successful at figuring out what the differences and trade-offs are.

    Does anyone have the secret decoder ring for all the differences between the SMRT86, SMRT86L2 and SMRT86S2 rotors?

    Any info appreciated.

    Thanks,
    Eric

  2. #2
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    They are the manufacturer's part numbers for different sizes. For example Universal Cycles has them differentiated as:

    SM-RT86 (160mm)
    SM-RT86M (180mm)
    SM-RT86L (203mm)

    https://www.universalcycles.com/shop...12&category=31

    If you look at the link you can see "MFG# listed for each size.
    The trouble with having an open mind is that people will insist on trying to put things in it.

  3. #3
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    Hi,

    I'm familiar with the nomenclature that you are referring to. But what I'm asking about is what a SM-RT86L2 really is. Notice the "2" on the end. There are a number of online retailers quoting this model number, in addition to others with the more standard SM-RT86L model number.

    Is the SM-RT86L2 really different than a SN-RT86L (in which case I'd like to understand the differences)?
    Or is it some kind of typo that's somehow become widespread online?

    Shimano XT Ice Tech Brake Rotors: SMRT86 Versus SMRT86L2 Versus SMRT86S2???-shimano_sm-rt86l2_rotors.jpg

    I embedded an image instead of using a link, since the link would likely become stale at some point.

    Thanks,
    Eric

  4. #4
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    You are really over-thinking it. There is only a Shimano SM-RT86. It comes in three sizes. You can see this from the Shimano website.

    https://bike.shimano.com/en-US/produ...0/SM-RT86.html

    The numbers that you are hung up on are the manufacturers part numbers. When I go into my local bike shop and tell the guy I need a 180mm. Shimano SM-RT86, he sends an order to Shimano quoting the part number as "ISMRT86M2" to ensure I get the correct size. Maybe some online sellers are taking/using the part number on their websites.
    The trouble with having an open mind is that people will insist on trying to put things in it.

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