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  1. #1
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    specialized sirrus or trek fx... for a big guy

    Looking to get back into biking. I am 6'6" and an athletic 250lbs (32 yrs old). I will be doing a sprint triathlon in the summer - but the bike will be mainly for fitness - ridden on roads and bike paths. The most I would do is one triathlon a year so I do not want to plan a bike purchase around it. I am not a serious triathlete.

    I have narrowed it down to the trek fx 7.2 or a specialized sirrus sport. I test rode the sirrus and liked it a lot. The shop did not have a trek 7.2 for my size. My main concern is whether the sirrus wheels are too thin for my weight. I may trim down to 230 but I hover in the 230-250 range.

    Will the sirrus 28mm wheels hold up for a guy my size? or are the wider trek wheels better off for me? DO the rims or spokes in these bikes differ greatly. Is one bike known to have more durability for a larger guy.

    I feel like the sirrus bike may be set up to be faster which I like. I would love to hear from some sirrus owners in my size range.

    Any insight or advice would be appreciated. Thanks

  2. #2
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    I'm about your weight, two inches shorter, and in my experience the only thing you're likely to have trouble with is wheels. The frames will support you fine. In general, I've had problems whenever I've gone with fewer than 36 spokes, and that's what I have now on the rear of all my bikes.
    Most road bikes these days come with much lighter wheels, 28/24 or even 24/20 rear and front. I know allegedly "big" guys who claim to use them successfully, but they usually turn out to weigh 185 or 200 or so. I'm not sure they (or most bike-shop people) understand the stresses that extra 50 pounds puts on the parts.
    Since you're buying over the counter, you probably can't change the wheels, but you should keep an eye on them. I've never had a catastrophic failure--they go out of true, break a spoke, wobble, break another spoke, and finally I decide "Screw it" and have a good local mechanic lace me up a stout wheel. The Velocity Deep Vs on my Atlantis now have almost 3000 miles on them with no attention at all. Also, you have no business on the standard 23mm tires. I wouldn't even consider a bike that didn't have room for at least 28s, and I do most of my riding on 35s.
    My other concern for a guy your height would be fit. I'm 6'4" and ride a 64 or 65cm frame, which is MUCH more comfortable than the 62s I rode for years because it was what shops had in stock ("We'll give you a longer seat post. It'll be fine..."). If they're trying to sell you a 62 or so, be a little suspicious. Anything larger than that is hard to find, but in my case the extra 3cm made a very big difference.

  3. #3
    aka Phil Jungels Wanderer's Avatar
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    Put a 36 spoke wheel on the back, with 32mm wide tires, and you should be good to go.

  4. #4
    Great State of Varmint Panthers007's Avatar
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    You could get a set of good wheels for pretty cheap - well, for less than the parts would cost you or I. Such as Mavic A719 rims with Shimano Ultegra hubs. These make excellent wheels for a hybrid - very fast and nimble and rock-solid. Or some with A319 rims to cut down the cost. Add some good 700 X 28C or 32C tires and you're good to go.
    How do you keep an idiot in suspense?

  5. #5
    Senior Member KungPaoSchwinn's Avatar
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    That Specialized has a CF fork,absorb bumps better than aluminum?.the bike cost more than the FX,may be you need to ride the FX as well but it has wider tires,both are nice however.
    2009 Trek FX 7.3

  6. #6
    Time for a change. stapfam's Avatar
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    The wheels could be a problem- but then I am not a lover of machine built wheels. Have a chat with the LBS and see if you can upgrade to a better set before taking delivery of the bike. If that is above your cost- then get the wheels de-tensioned and reworked before taking delivery. A good wheelbuilder can work miracles on even the most basic of wheels.

    And this would be the same suggestion for both bikes. Spoke count for a heavier rider does come in play when buying but if the wheels are rebuilt, then 32 spokes would not be a problem, however 36 spokes would be better.
    How long was I in the army? Five foot seven.


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  7. #7
    Great State of Varmint Panthers007's Avatar
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    I'd go with the Trek 7.2 FX myself. Trek's are great riders, and the FX series is fast and very nimble. But like all major bike companies - the wheels are the weakest link. I bought a Trek 7.5 FX. First I got a better saddle. Then I built a set of good wheels.

    The only component I worry about is the carbon fork it came with. As soon as that makes a peep, I'll replace it with steel.
    How do you keep an idiot in suspense?

  8. #8
    Pwnerer Wordbiker's Avatar
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    Quote Originally Posted by Panthers007 View Post
    I'd go with the Trek 7.2 FX myself. Trek's are great riders, and the FX series is fast and very nimble. But like all major bike companies - the wheels are the weakest link. I bought a Trek 7.5 FX. First I got a better saddle. Then I built a set of good wheels.

    The only component I worry about is the carbon fork it came with. As soon as that makes a peep, I'll replace it with steel.
    You stay up quite late.
    Quote Originally Posted by ahsposo View Post
    Ski, bike and wish I was gay.

  9. #9
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    I have the Sirrus Sport. I can't speak to the wheels, but I changed the tires to Ritchey Speedmax Cross 35 tires and there's plenty of clearance. I'm not sure I'd take it out into the woods, but it's great for getting off the pavement and onto hard dirt, grass, etc. The front fork is aluminum, but after changing the tires and the saddle (I now have a sprung, leather Masi salvaged from a Masi bike) it rides like a dream and is faster than I am.

  10. #10
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    Thanks for the input. I went down to a LBS and rode a 7.2 Fx. It was not in my size but I liked it. I ended up putting down a deposit and ordered a 25" frame. The shop said I could ride it when it came in and if I didn't like it I could get my deposit back.

    I like the sirrus but I think maybe it is too roady for me. I think the trek was a safer bet and more of an all around bike.

    As for the trek 7.2....If I wanted to in a year or so how hard it is to upgrade componnets. Like maybe getting a better derailer or better trigger shifters, or brakes?

    Thanks again for all the input.

  11. #11
    Zensunni Wanderer KShep's Avatar
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    Quote Originally Posted by tallvinny View Post
    As for the trek 7.2....If I wanted to in a year or so how hard it is to upgrade componnets. Like maybe getting a better derailer or better trigger shifters, or brakes?

    \.
    I took delivery of an FX 7.7 a week or so ago. Decided to upgrade the brakes and levers to Shimano XT and put on some Shimano m540 predals. Also went from 28c to 32c rubber. The main limiting factor to upgrading components is how deep into your pocket you want to go.

    Enjoy your FX. I'm very satisfied w/mine.
    2010 Carl Strong custom Ti road bike
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  12. #12
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    I bought a FX 7.5 last week. Love it. The only things i added were bar ends, water bottle cage and moved a quick release rear pack carrier from my 13 year old Trek Y3 full suspension. Big change from the Y3.. it is quick & nimble though!

  13. #13
    Time for a change. stapfam's Avatar
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    Quote Originally Posted by tallvinny View Post
    As for the trek 7.2....If I wanted to in a year or so how hard it is to upgrade componnets. Like maybe getting a better derailer or better trigger shifters, or brakes?

    Thanks again for all the input.
    The time to upgrade parts is when they wear out. If it still works- Why replace it?

    Most of us will do this and most parts are just a basic- swop over job. You may have to get some experienced help with setting up a derailler- but by the time you would have to change one- then you would have learnt how to adjust it from the current bike setup.
    How long was I in the army? Five foot seven.


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