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Frame Angles

Discussion in 'Fixed Gear and Single Speed' started by ASC1951, 22 May 2008.

  1. ASC1951

    ASC1951 Guru

    Location:
    Yorkshire
    Help and assistance, please, folks.

    I'm about to order a frame from the Chinese People's Bicycle Factory #2081
    (www.xacd.com.cn) and can't decide which frame to get. My last attempt showed that unless you know pretty much what you want before you order it, they get very shirty about discussing tweaks - "Why so long delay? Is very simple!". They are fabricators, after all, not design consultants.

    The bike will be a singlespeed fixed, but for general day rides i.e. it needs to be comfortable on rolling terrain for anything up to ten hours. I usually ride about a 70" gear.

    XACD's standard 53cm road frame has a seat angle of 74.5, a head angle of 71.5 and a wheelbase of 986cm according to their drawings. It also has lots of gubbins I don't need, so I could go for the track frame where the equivalents are 74, 73 and 974. They point out that I can customise any frame as much as I want, but I'm reluctant to interfere too much with the standard geometry because I don't know enough to do so with confidence.

    My gut feeling is that a 73 degree head angle is going to be twitchy in normal riding, particularly with the 10cm shorter wheelbase, and I would be much better getting them to put track dropouts on the road frame. Am I right in that?
     
  2. Mister Paul

    Mister Paul Honky

    Location:
    North Somerset
    Sorry, far too technical for me.
     
  3. Gerry Attrick

    Gerry Attrick Lincolnshire Mountain Rescue Consultant

    Flippin' 'eck! I just ride me bike.
     
  4. Dayvo

    Dayvo Just passin' through

    Location:
    O' slO'
    ¿Qué? :becool:

    Suggest you ask someone at your lbs, or 'possibly' our very own mickle and spandex can help!
     
  5. yenrod

    yenrod Guest

    As far as an MTB goes it'd be something like;

    73 seat

    71 / 72 head

    Relaxed h.angles absorb front impacts better on MTBS.

    23" TT

    ...and a 16.5 chainstay !

    ROADY:

    74' parrallel head and seat.

    With say, a 16" c.stays.

    Low seat tube length on both - you need to wag a frame during quite steep efforts and inspires confidence also to be able to get the knee over the TT...in other words cockpit room :smile:

    I used to ride;

    70' h.angle

    73 s.angle

    17" c.stays

    19.5 seat tube length...

    AN MTB frame. Set it up though to ride the road though.

    That was fantastic to ride ALL DAY - very comfortable, predictable, reliable (angles) ride. Steel too.

    Best ride i've ever had and had that for 15yrs :becool: and it was a Taiwan effort !
     
  6. RedBike

    RedBike New Member

    Location:
    Beside the road
    If it was up to me i would find a bike frame I found comfortable and copy the measurements,

    How do you order from this company?
    Are their prices listed anywhere?
     
  7. OP
    OP
    ASC1951

    ASC1951 Guru

    Location:
    Yorkshire
    I don't really have any mechanism for measuring angles accurately.

    XACD don't display prices on their site because they manufacture in remnibi but sell in USD, so the exchange rate does fluctuate. Ordering is straightforward - you tell them by email what you want, they give you the current price, you pay them and they ship it. Takes about four weeks, apparently. Lots of happy customers on this and the old Cycle Plus, as a thread search will show. The correspondance will be with "Porter", whose English is unusual but perfectly understandable.

    The road and track frames are USD 445 at the moment i.e. pretty good value.
     
  8. k-dog

    k-dog New Member

    The big manufacturers publish them in their catalogues along with the other dimensions.
     
  9. OP
    OP
    ASC1951

    ASC1951 Guru

    Location:
    Yorkshire
    They do indeed, but I can't find anything online for my Van Tuyl road frame. It is my most comfortable ride, but I do ride fixed in a slightly different way - for instance you don't honk up hills.
     
  10. xroads

    xroads New Member

    Those road dropouts look vertical to me. Surely you want horizontal or track end drop outs for fixed/single speed?
     
  11. OP
    OP
    ASC1951

    ASC1951 Guru

    Location:
    Yorkshire
    Well spotted.:thumbsup: In fact you can specify whatever droputs you want and they even do one I have never seen anywhere else, a track dropout with a derailleur hanger.

    Over the weekend I have found in my garage a nearly new wheel with a 120mm axle and flip/flop hub which I had forgotten all about, so I'm thinking more towards their standard track frame, which has pretty much the same angles as my main bike. I shall have to add bottle bosses and brake cable guides as well as a changing the seatstay bridge for a brake mount.