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  1. #1
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    Retrofitting Cranks with Power Meters - Good Idea?

    Hi there.

    I am interested in acquiring power meters for my bike.

    All winter I used an indoor trainer that displayed the watts and would like to continue to monitor this information to help me improve.

    I am pretty much set on sticking with SPD pedals - as I like the ability to be able to walk in the shoes without too much grief.

    If there was a company that made power meter pedals for SPD shoes - I would be all over that - but there doesn't seem to be one...

    My LBS suggested I send in my cranks (Rotors) to a place like 4iii's and they would retrofit my cranks with power meters.

    My question is - does this retrofit affect the integrity of the crank at all - and is this a good idea?

    Thanks,

    SparkyCanada
    Last edited by SparkyCanada; 07-12-2018 at 04:45 PM.

  2. #2
    'brifter' is a lame word.
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    They work fine.
    I work for some bike racers
    I've got some bikes, some guns,
    and a bunch of skateboards

  3. #3
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    4iiii works well.

    Stages has some of their left arm PMs on clearance. They work fine too.

  4. #4
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    I sent my hollowgram crank to 4iiii a year ago and have had no issues since.

  5. #5
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    With a Rotor crank you can also go with Power2Max, it's a replacement spider with integrated power meter. They make them for both the 30mm and 24mm spindle versions.

  6. #6
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    Quote Originally Posted by rcb78 View Post
    With a Rotor crank you can also go with Power2Max, it's a replacement spider with integrated power meter. They make them for both the 30mm and 24mm spindle versions.
    Yep, Power2Max is a good choice too - I have one on my gravel bike with a Rotor 3D crank - very reliable for me so far (over 2 years).
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  7. #7
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    Thanks for the replies everyone.

    As I've been checking these options out - I noticed that battery life can be quite different - even though they may use the same type of battery. Rechargeable options seem to be even worse.

    Why would 2 different manufacturers have different battery life times - even though the batteries are the same?

    Thanks,

    Sparky

  8. #8
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    Quote Originally Posted by SparkyCanada View Post
    Thanks for the replies everyone.

    As I've been checking these options out - I noticed that battery life can be quite different - even though they may use the same type of battery. Rechargeable options seem to be even worse.

    Why would 2 different manufacturers have different battery life times - even though the batteries are the same?

    Thanks,

    Sparky
    4iiii is just glued onto the crank arm. No change to the arm itself.

    My 4iiii takes one CR2032 which lasts quite a long time. I think I change it 2 to 3 times a year?

    Look for online sources of name brand CR2032, like Maxell or Sony. It's easy to find 10 packs at about $1.50 each, sometimes less.

  9. #9
    tlg
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    Quote Originally Posted by SparkyCanada View Post
    Why would 2 different manufacturers have different battery life times - even though the batteries are the same?
    Different batteries have different capacities. Just like with AA batteries. They don't all have the same life times.

    235 mAh
    http://data.energizer.com/pdfs/cr2032.pdf

    210 mAh
    http://www.farnell.com/datasheets/1496885.pdf
    Custom Di2 & Garmin/GoPro mounts 2013 SuperSix EVO Hi-MOD Team * 2004 Klein Aura V

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