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  1. #1
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    stem size for 1991 Trek 520

    Hellooo, I just got great bike, '91 520 in dark purple. the only problem is that the stem is just too long for me and it hurts by back. i'm going to buy a nitto technomic to fix this problem but am not sure what diameter to get. does anyone know what size this would be?

  2. #2
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    There are two sizes you need to check: the steerer tube diameter (probably 1" or 1 1/8") and the handlebar diameter. If you have calipers, these are pretty easy to measure; otherwise, go to your LBS and they will be able to measure for you.

  3. #3
    rhm
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    multimodal commuter rhm's Avatar
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    The quill part, that inserts into the fork, is 22.2 mm (7/8").

    You also need to know the handlebar clamp diameter, though. I'm guessing 25.4 mm (1") but 26 mm is possible. Let's hope someone else weighs in.

  4. #4
    Gouge Away kaliayev's Avatar
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    The Nitto stem is probably 26mm. If you have a Sakae handlebar it is most likely 25.4mm. You can get an adapter to use the smaller bar or buy a Nitto drop.

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