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Thread: To bridge or not to bridge, that's the chainstay question

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    Default To bridge or not to bridge, that's the chainstay question

    Well, the post title says it all, but...

    ¿What's your own personal opinion on road frame chainstay bridges?
    Absolute must for performance? fatigue risers?

    Yes? no? wtf?

    talk to me

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    Default Re: To bridge or not to bridge, that's the chainstay question

    Traditionally, they are (were) there for bracing a fender. Then, the multi-use unit morphed in a racing machine (late 1960s and through the 10 speed bicycle boom in the early 1970s). The brace was never questioned as for its being there, unused. Folks say it adds strength. I don't believe it as something that a human being can discern. I got used to the aesthetic element of a lapped bridge on a 22.2mm round stay so my bicycles had them. When I switched to oval stays in the late 1990s, I ceased brazing them in atmo.

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    Default Re: To bridge or not to bridge, that's the chainstay question

    Seems that, once again, think don't follow applies

    Thanks

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    Default Re: To bridge or not to bridge, that's the chainstay question

    My powertap hub can discern no meaningful difference in peak watts on bridgeless bike vs a bike w/ a bridge.

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    Default Re: To bridge or not to bridge, that's the chainstay question

    Here is a thread with contributions from eRichie, Curt Goodrich, Dave Anderson, and Frank the Welder:

    http://www.velocipedesalon.com/forum...dge-27065.html
    Jason Henkle
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    Default Re: To bridge or not to bridge, that's the chainstay question

    Quote Originally Posted by Pi Guy View Post
    Here is a thread with contributions from eRichie, Curt Goodrich, Dave Anderson, and Frank the Welder:

    http://www.velocipedesalon.com/forum...dge-27065.html
    Sorry for not having do the homewrok first, lazy me, guilty on all charges.

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    Default Re: To bridge or not to bridge, that's the chainstay question

    Quote Originally Posted by Amaro Bikes View Post
    Sorry for not having do the homewrok first, lazy me, guilty on all charges.
    No worries, I just remembered it because I participated in that thread a little. I wasn't trying to call you out. I think it's a neat topic. I also think it's interesting that FTW takes a different stance than the other framebuilding heavy weights in that thread.
    Jason Henkle
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    Default Re: To bridge or not to bridge, that's the chainstay question

    In my very limited building life (barely a fetus compared to the mature builders here), I've only added a chanistay bridge with a fender mount.
    DT

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    Default Re: To bridge or not to bridge, that's the chainstay question

    I didn't notice a difference without chain AND seat stays. That was a thru axle rear end. Very limited sample size though.
    Will Neide (pronounced Nighty, like the thing worn to bed)

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    Default Re: To bridge or not to bridge, that's the chainstay question

    in the ANSI frame stiffness test protocol RFC-0U812 (squeeze the unsupported dropouts towards each other) it scores higher marks with a bridge than without.

    seriously, the trapezoid is completed by the rear hub.
    Nick Crumpton
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    Default Re: To bridge or not to bridge, that's the chainstay question

    Quote Originally Posted by crumpton View Post
    in the ANSI frame stiffness test protocol RFC-0U812 (squeeze the unsupported dropouts towards each other) it scores higher marks with a bridge than without.

    seriously, the trapezoid is completed by the rear hub.
    I don't completely understand the ANSI rationale for testing a frame without an integral part of the system (hub or axle).
    Will Neide (pronounced Nighty, like the thing worn to bed)

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    Default Re: To bridge or not to bridge, that's the chainstay question

    Quote Originally Posted by Will Neide View Post
    I don't completely understand the ANSI rationale for testing a frame without an integral part of the system (hub or axle).
    because it was a joke. just assumed the second sentence cleared that up.
    Nick Crumpton
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    Default Re: To bridge or not to bridge, that's the chainstay question

    Quote Originally Posted by crumpton View Post
    because it was a joke. just assumed the second sentence cleared that up.

    Gotchya....just realized the OU812.
    Will Neide (pronounced Nighty, like the thing worn to bed)

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    Default Re: To bridge or not to bridge, that's the chainstay question



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    I'm just trying to find the bridge... Has anybody seen the bridge?

    (Have you seen the bridge?)
    I ain't seen the bridge!

    (Where's that confounded bridge?)

    The Crunge-Led Zeppelin

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    Default Re: To bridge or not to bridge, that's the chainstay question

    I like bridges
    I don't really care if they do anything or not
    I have rediscovered my like for bridges






    Cheers Dazza
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    Default Re: To bridge or not to bridge, that's the chainstay question

    I'm like most, I only put them in for fender mounts.
    Eric Doswell, aka Edoz
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    Default Re: To bridge or not to bridge, that's the chainstay question

    Quote Originally Posted by Dazza View Post
    I like bridges I don't really care if they do anything or not
    When you do them as nicely as those, i'm sure customers appreciate them as well - whether they do anything or not!

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    Default Re: To bridge or not to bridge, that's the chainstay question

    How about seat stay bridges for disc bikes?

    Seat stays can be quite a bit longer and are usually quite a bit smaller, is there a benefit for the stays in a disc bike? or is it just carried over from caliper brake frames?

    M
    Matt Moore

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    Default Re: To bridge or not to bridge, that's the chainstay question

    Quote Originally Posted by Hellafab View Post
    How about seat stay bridges for disc bikes?

    Seat stays can be quite a bit longer and are usually quite a bit smaller, is there a benefit for the stays in a disc bike? or is it just carried over from caliper brake frames?

    M
    I built two fairly identical MTB's. One with chain and seat stay braces and a quick release axle. The other without seat and chainstay braces and a thru axle. I, and a few other riders couldn't tell a difference. Both used the same chain and seat stays and both had chainstay mounted brake calipers (rocker dropouts......both were singlespeeds). Not a definitive answer to anything, but I felt pretty convinced given the size of the riders (150-175lbs) on rigid mtbs that the seat stay bridge was/is a carryover from caliper/canti/v-brakes.

    With that said, I like the look of the seatstay brace, and still add it on most bikes.
    Will Neide (pronounced Nighty, like the thing worn to bed)

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    Default Re: To bridge or not to bridge, that's the chainstay question

    I always thought chstay bridges come from very old (1920s and before) frames where the chainstays came out straight then bent outwards, like many bmx frames have.
    I remembered reading this Waltworks Bicycles: Random musings: do bridges matter?
    I also remember everyone who had met the founder of my old shop saying he used to call the ch.stay bridge a rin-deboli, rather than rinforzo.
    Ie. it makes it weaker (debole) rather than stronger (rinforzo).

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