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  1. #1
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    Converting 1996 Trek 820 to a 1x7 speed

    I have a Trek 820 and the amount of riding I do is mostly around the city of Chicago so I am thinking of converting it to a 1x7 so I can still have the option to shift with the rear if I want and also so I can kind of have some time to decide to go single speed or not. I was just wondering about the size of my seat tube. My seat post is 27.2 so I am looking at getting a N-Gear Jump Stop Chain Guide and they have a choice between 28.6, 31.8 and 34.9 so I just wanted to find out what the size I need to get since I lost my tape measure.
    Thanks

  2. #2
    Former Bike Wrench
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    I had a 1996 Trek 970 that had a 31.8mm seat tube diameter (and used a 27.2 seatpost)...both the 820 and 970 are steel, obviously the 970 having much higher grade but still, I'd be willing to bet they used the same diameters otherwise.

  3. #3
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    Quote Originally Posted by mtnbiker72
    I had a 1996 Trek 970 that had a 31.8mm seat tube diameter (and used a 27.2 seatpost)...both the 820 and 970 are steel, obviously the 970 having much higher grade but still, I'd be willing to bet they used the same diameters otherwise.
    Thanks.

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