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  1. #1
    Chairman of the Beard
    Reputation: hirschmj's Avatar
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    Why are my Arch EX 29er wheels so heavy?

    So I put together a spreadsheet for calculating the weight of some build kits I'm considering for my new frame, and I thought I'd throw my current bike in there.

    Frame weight is spot on, per my bike scale, but the wheels! 500 grams overweight for the pair! What on earth is going on?

    Arch EX stock build, per Jenson's website is 1860g measured, with valves and tape.
    Ardent 2.4 29er tire (I like traction, ok?) should be 807g per.
    RT86 ICE rotors in 180mm should be 135g.
    2 scoops of Stan's goo per tire should be 45g/scoop, 180g total
    Rear cassette is SRAM 990, should be 305g

    All together should be 3,922g, measured weight 4422g!

    If my tires are both way out of spec, say 100g over (which I doubt, I measured the second one at the shop), and there's twice as much Stan's in there as there should be (there isn't, maybe there's dried out Stan's hanging out in there? One tire is brand new though) I've still got 120 grams to find. The bolts on the brake rotors are the only thing I can think of, but I don't see those being more than 20g or so.

    Anything I'm not considering when trying to find this weight?
    The correct number of bikes one should own is N+1, where N is the number of bikes currently owned.

  2. #2
    Dropshot Champ!
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    did you weigh with qr's/thru bolts on?

    ardents aren't light, i thought they were heavier.

  3. #3
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    http://forums.mtbr.com/attachments/2...ardent.jpg.jpg

    Maxxis Ardent 2.4" 29"er Tires: Out Of The Box

    Rear was with a 135x10 thru bolt, that's a good point. It's a no-name one, like this:
    http://farm5.staticflickr.com/4054/4...39bdeaaa62.jpg
    110g. Good to know. Weight savings to be had by going with DT or someone similar.

    Still missing 390 grams, which I can get to if both tires are 107g overweight (doubtful) and I double the Stan's weight (also doubtful).

    Any other ideas on where stuff tends to be overweight?
    The correct number of bikes one should own is N+1, where N is the number of bikes currently owned.

  4. #4
    Dropshot Champ!
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    Unsure. The arch ex 29er wheels I weighed were like 1790g.

    FWIW, I used that same 10x135 no name steel thru-bolt for years. It becomes a pain to remove won't tightened. The 10x135 dt swiss RWS is half the weight. Can be found on ebay for about 40 shipped. Weight savings aside, it's just easier to remove the rear wheel now.

    only option is to tear everything down and weight it.

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