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  1. #1
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    Trek 7.2 FX fork pin and seat clamp size?

    I'm sure this is an obscure request and I hope I'm in the right subforum for this request.

    I'm moving to a big city in a couple weeks and buying a Trek 7.2 FX for commuting and to do delivery work. I'm going to be investing in a couple heavy duty U locks as well as securing everything I can with Pitlock's secure bolting system. I'm sure that this much protection is overkill for a $500 bike, but it's going to be my first time living in a crime-ridden city and my first bike that isn't a Walmart special, so I'm trying to be as proactive as humanly possible in how I protect it. I've been informed that the standard size skewers and seat post clamp are the correct size for this bike by the company I'm purchasing the bike from, however I've been unable to gather which size is necessary for the fork and seat clamp. If someone who has this bike could let me know the correct sizes, I would be incredibly grateful.

    The size options for the fork are 1", 1-1/8" (this appears to be the standard size?) and 1-1/4 inch. The seat post clamp options are 28.6mm, 30.0mm, 31.8mm and 35.0mm.

    Anyone who can help me with this, thanks so much!


    Also, since I'm here, I might as well get your opinions on this if anyone has one. I can get a 2014 7.2 FX disc for $479 or a 2015 with standard brakes, a water bottle cage, a (cheap, but passable for a short time, I assume) helmet, a small saddle bag and tire pump for $449. The apparent value on this is $90 (though I assume it's been marked up a bit anyway). For city riding, including doing deliveries in the rain and snow, which would you suggest? I won't be riding trails or other off road places where I've heard that disc brakes are the most valuable to a rider. Are the disc brakes worth the $30 price increase (plus the price of the pump, water bottle cage and a nicer helmet that I would then be buying even if I didn't get the package)? If I should make a separate thread for this, I understand. I just figured there's so many disc brake discussions on here probably already that another one might not be necessary.

  2. #2
    The Improbable Bulk Little Darwin's Avatar
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    If you plan to ride in rain and snow, I would suggest getting discs... Rim brakes are more susceptible to poor performance in wet conditions.

    As far as the headset. My 2011 7.3 FX is 1-1/8" so I would assume any FX would probably be the same. You can probably confirm on the Trek web site.
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  3. #3
    coprolite fietsbob's Avatar
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    Why worry ahead of time ? Drop By your Trek Dealer.. when you get there ..

    Forks, in the Past have been 1" but of late 1.125" is very Normal ..


    Perhaps you can pick up a Caliper so You can Measure what is in front of you ?
    I expect the Bike shop will have one to use while you are there.

    seat tube typically is what the FD goes around that is your numbers you mentioned Seat tube Out side Diameter .

    28.6mm(9/8"), 30.0mm, 31.8mm(1.25") and 35.0mm. (note how some metric decimal numbers are actually describing Inch-Fractions.)

    seat pin OD is actually the seat tube Internal Diameter, after finished Reaming in the factory.
    Last edited by fietsbob; 01-29-15 at 12:51 PM.

  4. #4
    PatronSaintOfDiscBrakes dynaryder's Avatar
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    Pretty sure your fork is 1 1/8",that's the most common size today. Why are you changing the seatpost clamp? The locking bolt that Pitlock uses just replaces the one already in your clamp.

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