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  1. #1
    the actual el guapo atomship47's Avatar
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    build questions / suggestions

    i have a trek 7300 and a db comfort bike (completely taken apart).

    just for kicks....i've decided to convert one frame/bike into a flat bar road/cx bike. the other bike i'd like to convert to more of a rough/off road bike.

    i'm not sure what things i have to consider before i start buying parts....

    here are some initial thoughts i have
    -the crank arms on the trek are too long for me. however, i haven't been able to find shorter cranks without having to buy the entire crankset.
    -i hate the suspension seatpost and fork on my trek. i'm thinking the trek should be my flat bar/cx bike for these reasons.
    -the db uses 26" wheels...so i'm thinking it should be my rough terrain bike.
    -i don't like the fork or seatpost with the db. soooooo, i'm thinking i'll take the fork and post off the trek and put them on the db.
    -i'll put an aftermarket cf fork, a new stem and new bars on the trek.

    can i even put a 27" fork on a 26" frame? is there a way of lowering how the brakes are mounted in order to work with a longer fork?

    both bikes have quill stems. can i easily replace the trek's fork with a threaded one and use a stem for a 1 1/8" fork?

    will a differnt headset fit this frame?

    the db frame has chrome cups stamped onto each end of the head tube. do i need to remove these cups before i can fit the trek fork on this bike?


    should i just trash the db and convert the trek?
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  2. #2
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by atomship47 View Post
    i have a trek 7300 and a db comfort bike (completely taken apart).

    just for kicks....i've decided to convert one frame/bike into a flat bar road/cx bike. the other bike i'd like to convert to more of a rough/off road bike.

    i'm not sure what things i have to consider before i start buying parts....
    Not that I think this is a good idea (lots of work for little return) but here goes.

    Quote Originally Posted by atomship47 View Post
    here are some initial thoughts i have
    -the crank arms on the trek are too long for me. however, i haven't been able to find shorter cranks without having to buy the entire crankset.
    Generally speaking, the whole crank is cheaper than the arms alone. Nashbar has a Shimano Trekking crank that is very good and very cheap ($45). They also have other cranks for even cheaper.

    The parts thing holds for bicycles too. Buying one in parts is always more expensive than buying a complete bike. Do your home work before you go too far. If your parts add up to more then around $500, the Trek 7.2 Fx or similar from another maker would be a better way to go.


    Quote Originally Posted by atomship47 View Post
    -i hate the suspension seatpost and fork on my trek. i'm thinking the trek should be my flat bar/cx bike for these reasons.
    As good a choice as any.

    Quote Originally Posted by atomship47 View Post
    -the db uses 26" wheels...so i'm thinking it should be my rough terrain bike.
    Again, as good a choice as any.

    Quote Originally Posted by atomship47 View Post
    -i don't like the fork or seatpost with the db. soooooo, i'm thinking i'll take the fork and post off the trek and put them on the db.
    There can be fit issues doing this. Check the diameter of the Trek post and make sure that it will fit in the Diamondback frame. Same with the fork. Unless the fork is the right length it might not fit in the frame correctly. If you are lucky, the Trek fork is longer then you need and you can cut it off. If you are really lucky, it's the same size. If you are unlucky, it will be too short. and you are sunk there. You can't add length to the steer tube. As my pappy says, "You cut it off twice and it's still too short!"

    Quote Originally Posted by atomship47 View Post
    -i'll put an aftermarket cf fork, a new stem and new bars on the trek.
    An okay choice but try to get one that has similar length blades to the existing fork. Too short or too long and the handling will be funky.

    Quote Originally Posted by atomship47 View Post
    can i even put a 27" fork on a 26" frame? is there a way of lowering how the brakes are mounted in order to work with a longer fork?
    If you have discs this wouldn't be a problem but with rim brakes you probably won't be able to do it. You could go with a 96er configuration and use a 700C wheel or add discs. Neither option is that cheap.

    Quote Originally Posted by atomship47 View Post
    both bikes have quill stems. can i easily replace the trek's fork with a threaded one and use a stem for a 1 1/8" fork?
    Most carbon forks are going to be threadless. You'll have to change the headset to a threadless and get a threadless stem. Not too expensive but are you starting to feel nickel and dimed to death yet?

    Quote Originally Posted by atomship47 View Post
    will a differnt headset fit this frame?
    As long as it's the right diameter, changing headsets isn't a problem. It's work but there shouldn't be any issues.

    Quote Originally Posted by atomship47 View Post
    the db frame has chrome cups stamped onto each end of the head tube. do i need to remove these cups before i can fit the trek fork on this bike?
    You probably only need to change the fork race on the Trek fork to the DB one. Then stuff should work well.


    Quote Originally Posted by atomship47 View Post
    should i just trash the db and convert the trek?
    Your call. But you have two lower level bikes. You could end up sinking a lot of money into them and still have a sow's ear. If you don't do all the work yourself, the cost is even higher. I'd suggest doing a lot of research on prices of parts and see if you are approaching the cost of another bike. If so, look at a new bike instead.
    Stuart Black
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  3. #3
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    quote from cyccommute:
    "Not that I think this is a good idea (lots of work for little return)"

    This was excellently phrased cyccommute, and i couldn't agree more. Sure it's possible, and sure, it might be fun. But why in G-d's name would you want to do it. Sell them both for whatever you can get and buy a nice frame to build up ... you are going to sink yourself in the cost of new parts, let alone the time it'll take to build.

  4. #4
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    I just got a headache about halfway through the post and had to stop reading. Not sure what you're trying to do or why, but best of luck with your project.

  5. #5
    the actual el guapo atomship47's Avatar
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    thanks for the feedback.

    no question, its a labor of love. the project is more about the work than the end result.

    i've been doing just what you suggested...scouring the net for decent prices on parts. i haven't been able to find parts to make the project "affordable"

    i may just get a new seatpost and handlebar for my 7300. if i like the changes, i'll think about switching to a rigid fork.
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    Your exact opposite is the Televangelist.

    Other personalities you would probably get along with are the Capitalist Pig, the Smartass, and the Sociopath.

  6. #6
    cs1
    cs1 is offline
    Senior Member cs1's Avatar
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    Quote Originally Posted by ginsoakedboy View Post
    I just got a headache about halfway through the post and had to stop reading. Not sure what you're trying to do or why, but best of luck with your project.
    LOL, so did I. Unfortunately, the masochist in me made me read it. I wish I didn't though.

    Tim
    1999 Waterford RSE-11, 1995 Waterford 1200, 1989 Specialized Rockhopper Comp
    1989 Raleigh Technium, 1989 Schwinn Traveler, 1986 Specialized Rockhopper
    1984 Specialized Stumpjumper, 1986 Specialized Stumpjumper and just way too many projects to list.

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