What's The Difference Between Shimano XT UN-73 and UN-72 BB's??- Mtbr.com
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  1. #1
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    What's The Difference Between Shimano XT UN-73 and UN-72 BB's??

    .......what is the difference between the Shimano XT UN-73 and UN-72 models??
    I need a new square tapered BB and the XT's a good value, just don't know which one to get.

    Thanx

  2. #2
    Derailleurless
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    Not much. The UN73 I believe went back to the plastic non-drive-side adapters, which I've never had a problem with but some riders look down on (why? dunno!). The 73 also appears to be a whopping 5g heavier than a similar sized UN72. There may be some seal or bearing improvements on the 73.

    Honestly, I'd pick whichever is the better price. Both are very reliable and essentially comparable units.

  3. #3
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    Thanx dude

    Thanx man

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