Advertise on Bikeforums.net



User Tag List

Results 1 to 11 of 11
  1. #1
    Senior Member blackcannon's Avatar
    Join Date
    Mar 2006
    Location
    Fairhaven, MA
    My Bikes
    Motobecane Jubilee Sport, Trek 400, Viner
    Posts
    148
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Are RX100 shifters 7 speed compatible??

    I have an older Crest Team Cannondale bike that I just got for my GF...I wanted to convert her downtube shifters to brifters....I was going to upgrade the shifters on my bike and put my RX100 8 speed shifters on hers...Is this possible? I tried searching but found no answers...I was also thinking of upgrading hers to 8speed but not sure if this is doable...I've searched and found out it is possible...Any ideas/suggestions/answers? Thanks

  2. #2
    Senior Member thePest's Avatar
    Join Date
    May 2006
    Location
    Pacific NW
    My Bikes
    none at this time
    Posts
    130
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by blackcannon
    .I was going to upgrade the shifters on my bike and put my RX100 8 speed shifters on hers...Is this possible? I tried searching but found no answers...I was also thinking of upgrading hers to 8speed but not sure if this is doable...I've searched and found out it is possible...Any ideas/suggestions/answers? Thanks
    Here are the things you will need to do:
    a.) change the pulleys in your rear derailleur to 8speed and the bolts. You will have a better and smoother shift. The 7's are a tad wide but will work.
    b.) I would relace an 8speed hub in, be easier. But if you want to go old school. You will need to overhaul {pull out the axle) to get to the bolt holding the freehub. Go get a 8sp or 9sp {w/spacer**. The inner cone MUST MATCH THE DUST CAP on the freehub.
    c.) going to an 8sp cassette {stay with Shimano** also means to replace the chain. This is a must to run an 8sp chain.

    Try and stay with this manufacture when doing the change over. it will save a lot of headaches...

  3. #3
    Senior Member blackcannon's Avatar
    Join Date
    Mar 2006
    Location
    Fairhaven, MA
    My Bikes
    Motobecane Jubilee Sport, Trek 400, Viner
    Posts
    148
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by thePest
    Here are the things you will need to do:
    a.) change the pulleys in your rear derailleur to 8speed and the bolts. You will have a better and smoother shift. The 7's are a tad wide but will work.
    b.) I would relace an 8speed hub in, be easier. But if you want to go old school. You will need to overhaul {pull out the axle) to get to the bolt holding the freehub. Go get a 8sp or 9sp {w/spacer**. The inner cone MUST MATCH THE DUST CAP on the freehub.
    c.) going to an 8sp cassette {stay with Shimano** also means to replace the chain. This is a must to run an 8sp chain.

    Try and stay with this manufacture when doing the change over. it will save a lot of headaches...

    Can I just put on the RX100 brifters with the current components for now...Will these brifters work on older 7 speed Shimano 105 components?

  4. #4
    Senior Member Retro Grouch's Avatar
    Join Date
    Feb 2004
    Location
    St Peters, Missouri
    My Bikes
    Rans Enduro Sport, Hase Kettweisel Tandem, Merin Bear Valley beater bike
    Posts
    23,113
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by blackcannon
    Can I just put on the RX100 brifters with the current components for now...Will these brifters work on older 7 speed Shimano 105 components?
    7-speed and 8-speed cassette spacing is just a tad off so the indexing won't be perfect but it'll work. To get the best results, adjust the cable tension so that the derailleur pulleys line up perfectly when you're in the middle rear cog.

    Good luck.

  5. #5
    Senior Member
    Join Date
    Sep 2001
    Location
    Montreal
    My Bikes
    Peugeot Hybrid, Minelli Hybrid
    Posts
    6,521
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I put Sora 8 speed brifters on my 7 sp bike. Sheldon brown has instructions for an alternate cable attachment at the rear der to make the movement of the der right for 7 sp. It wasnt too bad before this fix, but works fine now.

  6. #6
    Senior Member blackcannon's Avatar
    Join Date
    Mar 2006
    Location
    Fairhaven, MA
    My Bikes
    Motobecane Jubilee Sport, Trek 400, Viner
    Posts
    148
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You know what...I just took a second look at her bike and noticed it's 6 speed...Is the rear triangle on 6 speeds wide enough for upgrade?

  7. #7
    Senior Member
    Join Date
    Feb 2005
    Location
    Oklahoma
    My Bikes
    Trek 510, Trek 5500, Colnago C-50
    Posts
    8,876
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Most -speeds are freewheel, not cassette. You'll need to re-build the rear wheel with a new 8,9 hub.
    Why not buy her a nice new bike.

    Al

  8. #8
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    24,852
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    The rear triangle is the same width for 6 and 7-speeds at 126 mm. However, as Al1943 noted, most 6-speed bikes had freewheel hubs. Index compatible 7-speed freewheels are available but in a pretty limited choice of cogs. Shimano makes a 14x28 and an 11x 32(?) and that's it. 8-speed freewheels are available but require a 130 mm hub and rear triangle. You CAN NOT permanantly spread (cold set) your Cannondale to 130 mm safely but 130 mm hubs may fit the existing spacing with some effort.

  9. #9
    Senior Member blackcannon's Avatar
    Join Date
    Mar 2006
    Location
    Fairhaven, MA
    My Bikes
    Motobecane Jubilee Sport, Trek 400, Viner
    Posts
    148
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by HillRider
    The rear triangle is the same width for 6 and 7-speeds at 126 mm. However, as Al1943 noted, most 6-speed bikes had freewheel hubs. Index compatible 7-speed freewheels are available but in a pretty limited choice of cogs. Shimano makes a 14x28 and an 11x 32(?) and that's it. 8-speed freewheels are available but require a 130 mm hub and rear triangle. You CAN NOT permanantly spread (cold set) your Cannondale to 130 mm safely but 130 mm hubs may fit the existing spacing with some effort.
    Good info HillRider...Thanks...

    You got $700 you can give me Al?

  10. #10
    cycles per second Gonzo Bob's Avatar
    Join Date
    Oct 2003
    Location
    Minnesota
    My Bikes
    Vitus Aluminum, DiamondBack Apex, Softride Powerwing 700, "Generic" Ishiwata 022, Trek OCLV 110
    Posts
    1,790
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    some possibilities

    1) Run with the current 6-speed rear wheel. If you use the alternate cable attachment at the rear derailer http://www.sheldonbrown.com/gloss_aa-l.html#alternate , the 8-speed brifters might work OK.

    2) Keep same rear wheel but go 7-speed. How you go 7-speed depends on what type of wheel it is. If freewheel, then just get a 7-speed freewheel. If freehub, then it is Uniglide and you can get 7-speed Uniglide cassettes and loose cogs at Loose Screws http://www.thethirdhand.com/index.cg...id=53386728737 You could also swap it to a Hyperglide freehub and get a 7-speed Hyperglide cassette.

    3) New 8-speed wheel, cassette, chain. The Cannondale can't be cold set since it's aluminum, but you can spread the triangle 4mm each time you insert the wheel.

  11. #11
    Senior Member blackcannon's Avatar
    Join Date
    Mar 2006
    Location
    Fairhaven, MA
    My Bikes
    Motobecane Jubilee Sport, Trek 400, Viner
    Posts
    148
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Gonzo Bob
    some possibilities

    1) Run with the current 6-speed rear wheel. If you use the alternate cable attachment at the rear derailer http://www.sheldonbrown.com/gloss_aa-l.html#alternate , the 8-speed brifters might work OK.

    2) Keep same rear wheel but go 7-speed. How you go 7-speed depends on what type of wheel it is. If freewheel, then just get a 7-speed freewheel. If freehub, then it is Uniglide and you can get 7-speed Uniglide cassettes and loose cogs at Loose Screws http://www.thethirdhand.com/index.cg...id=53386728737 You could also swap it to a Hyperglide freehub and get a 7-speed Hyperglide cassette.

    3) New 8-speed wheel, cassette, chain. The Cannondale can't be cold set since it's aluminum, but you can spread the triangle 4mm each time you insert the wheel.
    Good info Gonzo....Thank you...

Posting Permissions

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