Page 1 of 2 1 2 LastLast
Results 1 to 25 of 35
  1. #1
    mtbr member
    Reputation:
    Join Date
    Jun 2009
    Posts
    36

    How do I put disk brakes on a bike that has v-brakes?

    My bro has a 02 Trek 8500. It has mounts on the front fork and rear of the frame for the disk brake calipers. How hard is it to upgrade to disk brakes? Do I need to switch out the wheel hubs to be able to mount rotors??

    Basically, I wanna know if this is something I can do myself in the garage...and what list of parts will I need? Are there just complete kits you can buy without gathering everything piece by piece (any good websites for this would be greatly appreciated)?

  2. #2
    cougarbait
    Reputation: Lambdamaster's Avatar
    Join Date
    Nov 2008
    Posts
    1,786
    it's not difficult at all

    if your hubs have disc mounts, they will have six holes for the rotor bolts. if they don't, then you'll have to either get your rims laced to disc hubs, or a better option would be just to buy a disc wheelset. I suggest for that bike you go mechanical disc... Avid BB7 is the best choice. two 160mm BB7s, a disc wheelset, and you're ready to go. it's just a few bolts and cabling.
    09AS-Rsl/09Six

  3. #3
    mtbr member
    Reputation:
    Join Date
    Jun 2009
    Posts
    36
    how much money am I looking at if I get the new wheelset and brake set? what about if I change my hubs for disk adaptable ones and reuse the current wheels? How much approximately? If it's too much I probably won't do it! Thanks for the tips man.

  4. #4
    What could go wrong ...
    Reputation: Zoke2's Avatar
    Join Date
    Nov 2007
    Posts
    1,954
    you could buy the BB7 brakes and a disc wheelset for $200-$250

    Disc Wheelset - $160

    Disc Wheelset - $100

    BB7 disc brakes - $90
    I used to ride to Win ... Now I ride to Grin

    While my guitar gently weeps, my bike sits there mocking me

  5. #5
    cougarbait
    Reputation: Lambdamaster's Avatar
    Join Date
    Nov 2008
    Posts
    1,786
    a set of xt hubs are like $90 or so, and it costs a bit of money to get them laced. It's much more cost-effective to buy a new pre-built wheelset.
    09AS-Rsl/09Six

  6. #6
    mtbr member
    Reputation:
    Join Date
    Jun 2009
    Posts
    36
    cool. thanks. do I need to get different brake levers? or will my original deore XT will work with this?

  7. #7
    mtbr member
    Reputation:
    Join Date
    Jun 2009
    Posts
    36
    Quote Originally Posted by Zoke2
    you could buy the BB7 brakes and a disc wheelset for $200-$250

    Disc Wheelset - $160

    Disc Wheelset - $100

    BB7 disc brakes - $90
    wait, is that $90 for just the front brakes?....so $180 for front and back together?

  8. #8
    mtbr member
    Reputation: Jlar's Avatar
    Join Date
    May 2006
    Posts
    508
    Quote Originally Posted by Big_Carp
    wait, is that $90 for just the front brakes?....so $180 for front and back together?
    Looks like $90 total front & rear.

  9. #9
    cougarbait
    Reputation: Lambdamaster's Avatar
    Join Date
    Nov 2008
    Posts
    1,786
    bb7s are around $40 a piece, so the $90 is for front and back, same brake levers should work, though speed dial 7 levers are a cheap upgrade at $17
    09AS-Rsl/09Six

  10. #10
    Nouveau Retrogrouch SuperModerator
    Reputation: shiggy's Avatar
    Join Date
    Dec 1998
    Posts
    47,824
    Quote Originally Posted by Lambdamaster
    bb7s are around $40 a piece, so the $90 is for front and back, same brake levers should work, though speed dial 7 levers are a cheap upgrade at $17
    You will also need new cables and housing.

    BUT be sure the frame has disc mounts. Treks of that era usually used an ad-on disc mount for the rear. They can be hard to find now and are not cheap. (like this one)
    mtbtires.com
    The trouble with common sense is it is no longer common

  11. #11
    mtbr member
    Reputation:
    Join Date
    Jun 2009
    Posts
    36
    great info guys thanks for the tips. So that $160 gets me both mavic wheels front and back?

  12. #12
    mtbr member
    Reputation:
    Join Date
    Jun 2009
    Posts
    36
    I hate to be needy but can someone make a list of ALL the things I will need? btw, are those bb7 brakes the only choice I have? are they good quality?

  13. #13
    mtbr member
    Reputation:
    Join Date
    Jun 2009
    Posts
    124
    Quote Originally Posted by shiggy
    You will also need new cables and housing.

    BUT be sure the frame has disc mounts. Treks of that era usually used an ad-on disc mount for the rear. They can be hard to find now and are not cheap. (like this one)
    heck even my 2009 mako still has those holes in the frame and i would need that adapter if i wanted to go disk lol
    2009 Gary Fisher Mako
    92' Trek 830 Antelope in restoration being turned into a commuter

  14. #14
    cougarbait
    Reputation: Lambdamaster's Avatar
    Join Date
    Nov 2008
    Posts
    1,786
    Quote Originally Posted by Big_Carp
    I hate to be needy but can someone make a list of ALL the things I will need? btw, are those bb7 brakes the only choice I have? are they good quality?
    bb7's are universally regarded as the best mechanical disc brake system, and at their price ($40), other inferior mechs are not really worth considering

    bb7 160mm front
    bb7 160mm rear
    (on sale here: http://www.pricepoint.com/detail.htm?stylePkey=12605)
    disc-ready wheelset
    2 brake cables and housings (I strongly recommend jagwire ripcord DIY...and they come in COLORS )
    http://www.jensonusa.com/store/produ...Brake+Kit.aspx
    optional:
    speed dial 7 levers
    http://www.jensonusa.com/store/produ...Levers+08.aspx
    09AS-Rsl/09Six

  15. #15
    mtbr member
    Reputation:
    Join Date
    Aug 2008
    Posts
    171
    Dear OP,
    Nobody here in cyberspace can help you.
    I could list what you would need but not knowing what kind of mounts are on there, what size rotors you are gonna run, my list would cause you a headache.

    You need longer cables to reach down to the front and rear hubs. Your current brake levers will work.
    Old bikes + new disc brakes sometimes = an adapter.

  16. #16
    AKA Frank N. Bike!!
    Reputation: Kona0197's Avatar
    Join Date
    Oct 2004
    Posts
    5,777
    OP: how about skipping mechanical disc brakes and going for hydraulic?
    My Bike: '03 Specialized HardRock FrankenBike
    My Blog: http://http://kona0197.wordpress.com/

  17. #17
    mtbr member
    Reputation:
    Join Date
    Jun 2009
    Posts
    36
    Quote Originally Posted by Kona0197
    OP: how about skipping mechanical disc brakes and going for hydraulic?
    is that the better choice? what's the difference in value vs. price over mechanical brakes? Are they really that much better?

  18. #18
    turtles make me hot
    Reputation: NYrr496's Avatar
    Join Date
    Sep 2008
    Posts
    4,215
    I say they're better, but I have no experience with BB7's. If you do not have rear disc mounts on your frame, check out Brake Therapy. I've used that thing. It works well.
    I like turtles

  19. #19
    mtbr member
    Reputation:
    Join Date
    Jun 2009
    Posts
    36
    nice. what size rotor should I get? 160mm, 185, or 203? I'm thinking 185mm?

  20. #20
    mtbr member
    Reputation:
    Join Date
    Jul 2009
    Posts
    429
    Here is my 2 cents. I just did this same upgrade about a month ago.

    Add up the cost of the brakes, mounts, cables and levers. You'd be surprised that it's going to be as much or maybe more than what you can get a set of hydraulics for. I paid $160 shipped for my '08 Juicy 7's brand new and it included everything but the wheels. My bike did not have a rear mount so I had to get an adapter from eBay. I weighed both options and by the time it was all said and done, it's around $300 either way with the mechanicals being only about $30 less. Installing the hydros doesn't require any hassles of cable mounting/running and adjusting. Bolt 'em on out of the box and go.

  21. #21
    cougarbait
    Reputation: Lambdamaster's Avatar
    Join Date
    Nov 2008
    Posts
    1,786
    bb7's with compression-less housings are $105, and his original levers work
    I prefer hydro, but bb7's are a good brake.. better than some hydros.
    If you can find a deal on juicys, go for it. I wouldn't bother with tektros though.
    I would get 160mm for a number of reasons.

    also, the OP has already said he has disc mounts in the first post.
    09AS-Rsl/09Six

  22. #22
    AKA Frank N. Bike!!
    Reputation: Kona0197's Avatar
    Join Date
    Oct 2004
    Posts
    5,777
    You can find Hayes hydros - not just the 9s or HFX - for cheap.
    My Bike: '03 Specialized HardRock FrankenBike
    My Blog: http://http://kona0197.wordpress.com/

  23. #23
    mtbr member
    Reputation:
    Join Date
    Jun 2009
    Posts
    36
    Hey guys, I took pics of the bike to show you the mounting spots on the front fork and rear of the frame. Can I put disk brakes on this thing or no?






  24. #24
    mtbr member
    Reputation:
    Join Date
    Jun 2009
    Posts
    36
    I also got another question about the rear wheel. I am planning to buy that mavic wheelset for $160. Does this mean that I will need to reuse my bontrager wheels skewers and my current cassette that comes on my trek? I'd really like to reuse them if I could because the bike has barely ever been ridden and almost everything is still like new.

    If I can reuse my current cassette, will it just mount right up to the mavic wheelset? or will I need spacers or anything else crazy like that?

  25. #25
    AKA Frank N. Bike!!
    Reputation: Kona0197's Avatar
    Join Date
    Oct 2004
    Posts
    5,777
    You are going to need an adapter for the rear that Trek makes. Also I did some digging for you. Here are some hydraulic sets for cheap. People will say they suck but I disagree. You will also need the adapter for these brake sets I am listing. For example if you get a Hayes caliper you will need a adapter to mount it to the fork or frame. No worries they are cheap.

    First of all here is what you need FIRST for the rear: http://cycleworksinc.com/product/tre...-rear-3964.htm

    Ask your local TREK dealer for it. He should have it.

    Hayes HFX 9s: http://wheelworld.com/itemdetails.cfm?ID=3864

    Hayes El Camino: http://www.universalcycles.com/shopp...ls.php?id=3872

    Hayes Stroker: http://www.jensonusa.com/store/produ...t.aspx?sc=FRGL

    Avid juicy 3: http://www.cambriabike.com/shopexd.asp?ID=87133

    Avid Juicy 5: http://greenfishsports.com/product/3...rake-2007.html

    Avid Juicy 7: http://www.jensonusa.com/store/produ...8.aspx?sc=FRGL

    Avid Elixer R: http://www.ecrater.com/product.php?pid=3864990

    Shimano Deore: http://www.cambriabike.com/shopexd.asp?ID=28420

    ADAPTERS:

    Hayes Adapters: http://www.jensonusa.com/store/produ...-+Various.aspx

    Other Hayes Adapters: http://www.jensonusa.com/store/produ...e+Adapter.aspx

    Avid Adapters: http://www.jensonusa.com/store/produ...e+Adapter.aspx

    Shimano Adapters: http://www.jensonusa.com/store/produ...+Adapters.aspx

    You can use your old cassette on the new wheelset. it will mount up just fine. You will need a tool to get it off. Your new wheels should come with their own skewers but you can use the old ones if you like.
    Last edited by Kona0197; 08-19-2009 at 10:00 PM.
    My Bike: '03 Specialized HardRock FrankenBike
    My Blog: http://http://kona0197.wordpress.com/

Page 1 of 2 1 2 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •