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Thread: Going from a triple to a double - what don't I know?

  1. #111
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    Quote Originally Posted by jrenaut View Post
    Now that you've gotten me curious, my previous PR on that segment was fixed (46X16 or about 77 gear inches).
    I have found rather little correlation between PRs and equipment. (At least when we're comparing loosely comparable systems.) . I have found a very strong correlation between riding a new bike/build and PRs, though.

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  3. #112
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    Quote Originally Posted by dkel View Post
    I hadn't ridden Two Sisters westbound for a looong time until last week; I was amazed how steep it is going that way. At my best I'd keep it to 70gi. You're a beast for going after it at 80-something.
    It is surprisingly steep when you're not feeling energetic. But at least it's short.

    Quote Originally Posted by jrenaut View Post
    Now that you've gotten me curious, my previous PR on that segment was fixed (46X16 or about 77 gear inches).
    Ok I have to admit here that I haven't actually ridden it with that 80+ gearing. Though I have done 48x16 on it plenty of times - and I'm sure Dirt and OneEighth have as well.

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    Dang. I don't think that's supposed to happen. (BB explosion)

  5. #114
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    Quote Originally Posted by EasyRider View Post
    Dang. I don't think that's supposed to happen. (BB explosion)
    Neither did the bike shop. It had about 5,000 miles on it, so not new but by no means ancient.

  6. #115
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    Quote Originally Posted by jrenaut View Post
    Neither did the bike shop. It had about 5,000 miles on it, so not new but by no means ancient.
    Upgrading to external-cup BB is probably worth putting on the list. Probably makes sense to decide if you like 1x and then, if so, just get one of the SRAM 1 cranksets. Looks like Apex 1 cranksets are around $100 (when you include the BB). Looks like they also use a new chainring BCD "standard", though !?? Maybe SRAM didn't like Shimano having all the fun making up new standards.

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    Quote Originally Posted by hozn View Post
    Upgrading to external-cup BB is probably worth putting on the list. Probably makes sense to decide if you like 1x and then, if so, just get one of the SRAM 1 cranksets. Looks like Apex 1 cranksets are around $100 (when you include the BB). Looks like they also use a new chainring BCD "standard", though !?? Maybe SRAM didn't like Shimano having all the fun making up new standards.
    Upgrading to external BB -- for performance gains/compatibility with more advanced cranksets, not durability, right?

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    Quote Originally Posted by EasyRider View Post
    Upgrading to external BB -- for performance gains/compatibility with more advanced cranksets, not durability, right?
    external cup BBs are more durable. larger diameter bearing = more ball bearings = loads are spread over more bearing surface. they also place the bearings further outboard from the BB shell which puts less axial load on the bearings. Also, to run any type of "modern" crankset, i.e., anything post-Shimano Hollow Tech, you'll need outboard bearings.

  9. #118
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    Aesthetically, I strongly prefer the internal BBs. Not sure the benefits of an external would be worth it to me.

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    Yeah, I get the compatibility with modern parts, and figured with larger bearings, durability should be better. But in practice, doesn't having the bearings outside the frame expose them to grit and grime, especially off-pavement, and make them go kaput sooner? Kaput meaning rough and unpleasant feeling, not necessarily failure like the above picture?

  11. #120
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    Quote Originally Posted by jrenaut View Post
    Aesthetically, I strongly prefer the internal BBs.
    Agree to disagree on this point!


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